Implications of converting native forest areas to agricultural systems on the dynamics of CO2 emission and carbon stock in a Cerrado soil, Brazil.

The conversion of native vegetation to agricultural areas leads to a natural process of carbon loss but these systems can stabilize in terms of carbon dynamics depending on the management and conversion time, presenting potential to both store and stabilize this carbon in the soil, resulting in lower soil respiration rates. In this context, this study aimed to investigate the effect of converting native Cerrado forest areas to agricultural systems with a forest planted with Eucalyptus camaldulensis and silvopastoral systems on the dynamics of CO2 emission and carbon stock at different soil depths. The experimental sites are located in the Midwest of Brazil, in the coordinates 20°22'31″ S and 51°24'12″ W. Were evaluated soil CO2 emission (FCO2), soil organic carbon, the degree of humification of soil organic matter (HLIFS), soil temperature, soil moisture, and soil chemical and physical attributes. The soil of the area is classified as an Oxisol (Haplic Acrustox). Soil samples were collected at depths of 0.00-0.10, 0.10-0.20, 0.20-0.30, and 0.30-0.40 m. The lowest FCO2 values were found in the silvopastoral system (1.05 µmol m-2 s-1), followed by the native forest (1.65 µmol m-2 s-1) and the eucalyptus system (1.96 µmol m-2 s-1), indicating a 36% reduction in FCO2 compared to the conversion of the native forest to the silvopastoral system and an increase of 19% when converting the native forest to the eucalyptus system. The soil chemical attributes (N, K+, Ca2+, H++Al3+, CEC, and organic carbon) showed a decrease along the profile. The shallowest depths (0.00-0.10 and 0.10-0.20 m) presented no differences between systems but the subsequent depths (0.20-0.30 and 0.30-0.40 m) had a difference (95% confidence interval), relative to N, Ca2+, H++Al3, CEC, and organic carbon stock (OCS), and the soil under silvopastoral system showed a higher concentration of these attributes than the native forest. The multivariate analysis showed that the eucalyptus and silvopastoral systems did not differ from the forest in the shallowest soil layer but differed from each other. This behavior changed from the second assessed depth (0.10-0.20 m), in which the silvopastoral system stands out, differing both from the eucalyptus system and from the native forest, and this behavior is maintained at the following depths (0.20-0.30 and 0.30-0.40 m). OCS, H++Al3, CEC, and nitrogen are strongly related to land use change for silvopastoral system. Regarding the behavior/relationship of attributes as a function of depth, the silvopastoral system contributed to soil carbon accumulation and stability over consecutive years.

Prevalencia de déficit de vitamina B12 en sangre periférica de madres cursando el puerperio inmediato en el Centro Hospitalario Pereira Rossell

Objetivo: evaluar la prevalencia del déficit de vitamina B12 en mujeres cursando puerperio inmediato. Material y método: estudio observacional descriptivo de captación prospectiva de la cohorte en estudio. Muestra de 133 mujeres cursando el tercer trimestre de embarazo en la maternidad del Centro Hospitalario Pereira Rossell (CHPR), Montevideo, Uruguay, entre setiembre de 2021 y octubre de 2022. Se obtuvieron muestras de sangre materna en el puerperio inmediato por punción venosa periférica. Estas muestras fueron procesadas mediante inmunoensayo de electroquimioluminiscencia. Además, se aplicó una entrevista para la evaluación de los hábitos nutricionales. Resultados: todas las pacientes reportaron tener una dieta omnívora, excepto una, que manifestó llevar una dieta vegana y recibía suplementación diaria de vitamina B12. El 75,9% de la muestra del estudio presentó un nivel socioeconómico bajo, puntuado según el cuestionario de medición de nivel socioeconómico del INSE (Índice de nivel socioeconómico, 2018 - Cámara de Empresas de Investigación Social y Mercado del Uruguay, CEISMU). Se registró una prevalencia de déficit de vitamina B12 de 39,10% (n: 52). Conclusiones: a pesar de que esta muestra de embarazadas presenta una dieta omnívora, se detectó una elevada prevalencia de déficit de vitamina B12. Dada la importancia de esta vitamina en la salud materna, fetal y neonatal, se deberían considerar políticas de salud pública de prevención de la deficiencia tanto en embarazadas como en madres lactantes.

Objective: To assess the prevalence of vitamin B12 deficiency in women during the immediate postpartum period. Method: Descriptive observational study with prospective cohort recruitment, involving a sample of 133 women in their third trimester of pregnancy at the Maternity Department of the Pereira Rossell Hospital Center (CHPR) in Montevideo, Uruguay, between September 2021 and October 2022. Maternal blood samples were obtained during the immediate postpartum period through peripheral venous puncture. These samples were processed using electrochemiluminescence (ECL) immunoassay. Additionally, a nutritional interview was conducted to assess dietary habits. Results: All patients reported following an omnivorous diet, except for one who reported following a vegan diet and received daily vitamin B12 supplementation. Seventy-five point nine percent (75.9%) of the study sample exhibited a low socioeconomic status as determined by the Socioeconomic Level Measurement Questionnaire of the INSE (Socioeconomic Level Index, 2018 - CEISMU, Uruguay). Resulting in a vitamin B12 deficiency prevalence of 39.10% (n: 52). Conclusions: Despite the fact that this sample of pregnant women maintains an omnivorous diet, a high prevalence of vitamin B12 deficiency was detected. Given the significance of vitamin B12 for maternal, fetal, and neonatal health, public health policies for preventing deficiency should be considered for both pregnant women and lactating mothers.

Objetivos: Avaliar a prevalência da deficiência de vitamina B12 em mulheres durante o pós-parto imediato. Métodos: Estudo observacional descritivo de recrutamento prospectivo da coorte em estudo; amostra com 133 mulheres no terceiro trimestre de gravidez na maternidade do Centro Hospitalar Pereira Rossell (CHPR), em Montevidéu Uruguai, entre setembro de 2021 e outubro de 2022. As amostras de sangue materno foram obtidas no pós-parto imediato por punção venosa periférica que foram processadas por imunoensaio eletroquimioluminescente. Além disso, foi realizada uma entrevista nutricional para avaliar hábitos nutricionais. Resultados: Todas as pacientes relataram ter dieta onívora, exceto uma que relatou ter dieta vegana e receber suplementação diária de vitamina B12. 75,9% da amostra apresentou baixo nível socioeconômico de acordo com o Questionário de Medição do Nível Socioeconômico do INSE (Índice de Nível Socioeconômico, 2018 - CEISMU, Uruguai). Uma prevalência de deficiência de vitamina B12 de 39,10% (n: 52) foi registrada. Conclusões: Embora esta amostra de gestantes tenha dieta onívora, uma alta prevalência de deficiência de vitamina B12 foi detectada. Dada a importância da vitamina B12 na saúde materna, fetal e neonatal, devem ser consideradas políticas de saúde pública para prevenir a deficiência tanto em mães grávidas como em lactantes.

Síndrome de Burnout en residentes y posgrados de Neonatología en un centro hospitalario de tercer nivel. Análisis situacional y seguimiento, período 2021 - 2023

Introducción: los residentes y posgrados son un eslabón central en los servicios hospitalarios. El síndrome de Burnout se define como el agotamiento físico y emocional resultado de la exposición crónica al estrés en el ámbito laboral. El Maslach Burnout Inventory (MBI-HSS) es un instrumento diseñado y validado para evaluarlo. El objetivo de este estudio es determinar la prevalencia del síndrome de Burnout en nuestro servicio y compararla entre los estudiantes de distintas generaciones para luego poner en marcha mecanismos que permitan realizar seguimiento, detección temprana e identificación de factores modificables. Material y método: estudio transversal, descriptivo, observacional, desarrollado en abril de 2021 a través de la realización del test MBI-HSS para el diagnóstico de situación. Este estudio continuará con una segunda etapa que consta de la aplicación del test cada cuatro meses, la cual no desarrollaremos en el presente trabajo. La población objetivo la constituyen todos los residentes y posgrados de la especialidad de Neonatología en un centro hospitalario de tercer nivel. Se aplicó el cuestionario MBI-HSS y un cuestionario general para caracterizar a la población. Resultados: se incluyeron un total de 22 participantes, de los cuales 13 presentaron puntajes altos de agotamiento emocional, 9 obtuvieron un valor alterado de despersonalización y 9 presentaron puntajes bajos de realización personal. Seis participantes (27%) presentaron puntajes alterados para las tres variables. Conclusiones: se evidenció una alta prevalencia de Burnout, el 27% en la población total. Se encontraron diferencias estadísticamente significativas para los ítems despersonalización y realización personal entre los distintos años de la especialidad, con mayor puntaje de despersonalización y menor puntaje de realización personal en los de segundo y tercer año. Esto constituye un elemento de alarma que exige la modificación inmediata del funcionamiento y de las actividades.

Introduction: Residents and postgraduates are a fundamental part of hospital services. Burnout Syndrome is defined as physical and emotional exhaustion resulting from chronic exposure to stress in the workplace. The Maslach Burnout Inventory (MBI-HSS) is an instrument designed and validated to evaluate it. The objective of this study is to determine the prevalence of Burnout Syndrome in our service and to compare it among students of different generations to then implement mechanisms that allow monitoring, early detection and identification of modifiable factors. Materials and methods: Cross-sectional, descriptive, observational study carried out in April 2021 through the Maslach Burnout Inventory - Human Services Survey (MBI-HSS) test to carry out a diagnosis of the situation. This study will continue with a 2nd stage consisting of the application of the test every 4 months, which we will not develop in this work. The target population is all residents and postgraduates in the neonatology specialty at a tertiary level hospital. The MBI-HSS questionnaire and a general questionnaire were applied to characterize the population. Results: A total of 22 participants were included, of which 13 presented high scores of emotional exhaustion, 9 obtained an altered value of depersonalization and 9 presented low scores of personal fulfillment. Six participants, 27%, presented altered scores for the three variables. Conclusions: A high prevalence of Burnout was evidenced, being 27% in the total population. Statistically significant differences were found for the items "depersonalization" and "personal fulfillment" between the different years of the specialty, with higher depersonalization scores and lower personal fulfillment scores in the second and third years. This constitutes an alarm element, which requires immediate modification of the operation and activities.

Introdução: Residentes e pós-graduandos constituem um elo central nos serviços hospitalares. A Síndrome de Burnout é definida como exaustão física e emocional resultante da exposição crônica ao estresse no ambiente de trabalho. O Maslach Burnout Inventory (MBI-HSS) é um instrumento elaborado e validado para avaliá-lo. Objetivo: O objetivo deste estudo é determinar a prevalência da Síndrome de Burnout no Serviço de Neonatologia do Centro Hospitalario Pereira Rossel e compará-la entre estudantes de diferentes gerações para então implementar mecanismos que permitam monitoramento, detecção precoce e identificação de fatores modificáveis. Materiais e métodos: Estudo transversal, descritivo, observacional realizado em abril de 2021 por meio do teste Maslach Burnout Inventory - Human Services Survey (MBI-HSS) para diagnóstico da situação. Este estudo continuará com uma 2ª etapa que consiste na aplicação do teste a cada 4 meses, que não desenvolveremos neste trabalho. A população-alvo são todos os residentes e pós-graduandos da especialidade de neonatologia de um hospital de nível terciário. O questionário MBI-HSS e um questionário geral foram aplicados para caracterizar a população. Resultados: Foram incluídos 22 participantes, dos quais 13 apresentaram escores elevados de exaustão emocional, 9 obtiveram valor alterado de despersonalização e 9 apresentaram escores baixos de realização pessoal. Seis participantes, 27%, apresentaram escores alterados nas três variáveis. Conclusões: Evidenciou-se uma alta prevalência de Burnout de 27% na população total. Foram encontradas diferenças estatisticamente significativas nos itens "despersonalização" e "realização pessoal" entre os diferentes anos da especialidade, com maiores pontuações de despersonalização e menores pontuações de realização pessoal no segundo e terceiro anos. Isto constitui um elemento de alarme, que requer modificação imediata do funcionamento e das atividades.

Artificial neural networks and adaptive neuro-fuzzy inference systems for prediction of soil respiration in forested areas southern Brazil.

The purpose of this study was to estimate the temporal variability of CO2 emission (FCO2) from O2 influx into the soil (FO2) in a reforested area with native vegetation in the Brazilian Cerrado, as well as to understand the dynamics of soil respiration in this ecosystem. The database is composed of soil respiration data, agroclimatic variables, improved vegetation index (EVI), and soil attributes used to train machine learning algorithms: artificial neural network (ANN) and an adaptive neuro-fuzzy inference system (ANFIS). The predictive performance was evaluated based on the mean absolute error (MEA), root mean square error (RMSE), mean absolute percentage error (MAPE), agreement index (d), confidence coefficient (c), and coefficient of determination (R2). The best estimation results for validation were FCO2 with multilayer perceptron neural network (MLP) (R2 = 0.53, RMSE = 0.967 µmol m-2 s-1) and radial basis function neural network (RBF) (R2 = 0.54, RMSE = 0.884 µmol m-2 s-1) and FO2 with MLP (R2 = 0.45, RMSE = 0.093 mg m-2 s-1) and RBF (R2 = 0.74, 0.079 mg m-2 s-1). Soil temperature and macroporosity are important predictors of FCO2 and FO2. The best combination of variables for training the ANFIS was selected based on trial and error. The results were as follows: FCO2 (R2 = 16) and FO2 (R2 = 29). In all models, FCO2 outperformed FO2. A primary factor analysis was performed, and FCO2 and FO2 correlated best with the weather and soil attributes, respectively.

Prevalencia de sífilis gestacional y congénita en una maternidad pública de Montevideo, Uruguay, en los años 2018 y 2019

Introducción: Pese a que la sífilis congénita es prevenible, la transmisión materno infantil es un problema de salud mundial. Objetivo: Determinar la prevalencia de sífilis gestacional activa y la prevalencia de sífilis congénita en el período comprendido entre 1 de enero de 2018 y 31 de diciembre de 2019 en la maternidad de referencia del sector público de Uruguay. Metodología: Trabajo observacional, descriptivo y transversal. Resultados: Se revisaron 11.949 historias clínicas siendo seleccionadas 107 pacientes en el año 2018 y 142 pacientes en el año 2019 que cumplían criterios de inclusión. La prevalencia calculada de sífilis gestacional fue de 20,8 cada 1.000 mujeres embarazadas (249/11.949), la incidencia de sífilis congénita fue de 1,0 cada 1.000 nacidos vivos (12/11.949). La mortalidad en ambos períodos fue de 0%. Conclusiones: La prevalencia de sífilis gestacional aumentó en el período 2018-2019. Esta tendencia es consonante con el aumento de la prevalencia mundial. La prevalencia obtenida de 20,8 cada 1.000 mujeres embarazadas es alta de forma comparativa con los datos nacionales, a diferencia de la incidencia de sífilis congénita (1,0/1.000) inferior a las nacionales que oscilaban de 1,4 a 2,2 cada 1.000 nacidos vivos en los últimos años.

Background: Although congenital syphilis is preventable, mother-to-child transmission is a worldwide health problem. Aim: To determine the prevalence of active gestational syphilis and the prevalence of congenital syphilis in the period between January 1, 2018 and December 31,2019 in the reference maternity unit of the public sector of Uruguay. Methods: Observational, descriptive and cross-sectional work. Results: 11,949 medical records were analyzed, 107 patients were selected in 2018 and 142 patients in 2019 who met the inclusion criteria. The calculated prevalence of gestational syphilis was 20.8 per 1000 pregnant women (249/11949), the incidence of congenital syphilis was 1.0 per 1,000 live births (12/11949). Mortality was 0% in both periods. Conclusions: The prevalence of gestational syphilis increased in the 2018-2019 period. This trend is consistent with the increase in prevalence worldwide. The prevalence obtained 20.8 per 1,000 pregnant women is high compared to national data, unlike the incidence of congenital syphilis (1.0/1,000) lower than the national ones that ranged from 1.4 to 2.2 per 1,000 live births in recent years.

Machine learning for prediction of soil CO2 emission in tropical forests in the Brazilian Cerrado.

Soil CO2 emission (FCO2) is a critical component of the global carbon cycle, but it is a source of great uncertainty due to the great spatial and temporal variability. Modeling of soil respiration can strongly contribute to reducing the uncertainties associated with the sources and sinks of carbon in the soil. In this study, we compared five machine learning (ML) models to predict the spatiotemporal variability of FCO2 in three reforested areas: eucalyptus (RE), pine (RP) and native species (RNS). The study also included a generalized scenario (GS) where all the data from RE, RP and RNS were included in one dataset. The ML models include generalized regression neural network (GRNN), radial basis function neural network (RBFNN), multilayer perceptron neural network (MLPNN), adaptive neuro-fuzzy inference system (ANFIS) and random forest (RF). Initially, we had 32 attributes and after pre-processing, including Pearson's correlation, canonical correlation analysis (CCA), and biophysical justification, only 21 variables remained. We used as input variables 19 soil properties and climate variables in reforested areas of eucalyptus, pine and native species. RF was the best model to predict soil respiration to RE [adjusted coefficient of determination (R2 adj): 0.70 and root mean square error (RMSE): 1.02 µmol m-2 s-1], RP (R2 adj: 0.48 and RMSE: 1.07 µmol m-2 s-1) and GS (R2 adj: 0.70 and RMSE: 1.05 µmol m-2 s-1). Our findings support that RF and GRNN are promising for predicting soil respiration of reforested areas which could help to identify and monitor potential sources and sinks of the main additional greenhouse gas over ecosystems.

Descripción de resultados perinatales en madres COVID positivas asistidas en un medio público y uno privado de Montevideo en el período marzo 2020-junio 2021 / Description of perinatal results in COVID positive mothers assisted in public and private institutions in Montevideo, between March 2020 and June 2021 / Descrição dos resultados perinatais em mães COVID-positivo atendidas em instituições de saúde públicas e privadas em Montevidéu no período março de 2020-junho de 2021

Introducción: el SARS-CoV-2 produjo una pandemia afectando la salud de la población mundial desde el año 2019, lo que determinó cambios en las conductas sanitarias. Objetivos: describir resultados obstétricos-neonatales en madres COVID-19 positivas al momento del nacimiento en la asistencia pública y privada en el período desde marzo de 2020 a junio de 2021. Metodología: estudio observacional descriptivo, retrospectivo de las embarazadas COVID-19 positivas al momento del parto y sus neonatos en en el Centro Hospitalario Pereira Rossell y en Médica Uruguaya. Resultados: se obtuvo una muestra de 240 madres y 244 neonatos. El 0,42% (n=1) de las madres presentó sintomatología grave por COVID-19. El 46% (n=110) de los embarazos finalizaron por cesárea. El 3% (n=7) de las madres ingresaron a terapia intensiva, en su mayoría por complicaciones de la gestación. En cuanto a los recién nacidos, tuvieron contacto con su madre el primer día de vida el 86,5% (n=211), siendo la causa principal de ingreso a Terapia Intensiva no contar con cuidador. Se realizó PCR a todos sin identificar transmisión vertical. La internación fue mayor a tres días en 36,48% (n=89). Se registró una sola muerte neonatal por prematurez extrema. Fueron alimentados con pecho exclusivo el 19,67% (n=48) en la internación. Conclusiones: la pandemia afectó la asistencia inicial del binomio madre-hijo. No observamos ascenso en el número de cesáreas pero sí disminución en lactancia exclusiva, prolongación de la estadía hospitalaria y aumento del ingreso en áreas de cuidado intensivo sin detectar contagios en los neonatos.

Summary: Introduction: SARS-CoV-2 virus caused a pandemic that affected the health of the world´s population since 2019, what resulted in changes in health behaviors. Objectives: to describe obstetrical and neonatal results in mothers positive for COVID-19 at the time of birth in public and private institutions between March, 2020 and June, 2021. Method: observational, descriptive, retrospective study of pregnant women positive for COVID-19 at the time of delivery and their neonates at Pereira Rossell Hospital and Medica Uruguaya. Results: a sample of 240 mothers and 244 neonates was studied. 0.42% (n=1) of mothers evidenced severe symptoms for COVID-19. 46% (n=110) of pregnancies ended up in C-sections. 3% of mothers were admitted to ICU due to gestational complications in most cases. As to the newborns, 86.5% of them were in contact with their mother their first day of life, the first cause for their being admitted to ICU was absence of a caregiver. PCR tests were performed to all newborns and no vertical transmission was identified. Hospitalization was longer than three days in 36.48% of cases (n=89). Only one neonatal death was recorded as a consequence of extreme prematurity. Exclusively breastfed babies represented 19.67% (n=48) during hospitalization. Conclusions: the pandemic affected the initial assistance of the mother-child binomial. No increase was observed in the number of C-sections, although exclusive breastfeeding did decrease, hospitalization was longer and there was an increase in admission to the ICU although no neonate contagion was observed.

Introdução: o SARS-CoV-2 produziu uma pandemia afetando a saúde da população mundial desde 2019, o que determinou mudanças nos comportamentos de saúde. Objetivos: descrever os desfechos obstétrico-neonatais em mães positivas para COVID-19 no momento do parto na rede pública e privada no período de março de 2020 - junho de 2021. Metodologia: estudo observacional descritivo retrospectivo de gestantes positivas para COVID-19 no momento do parto e seus recém-nascidos no Hospital Pereira Rossell e Médica Uruguaya. Resultados: obteve-se uma amostra de 240 mães e 244 recém-nascidos. 0,42% (n=1) das mães apresentaram sintomas graves de COVID-19. 46% (n=110) das gestações terminaram por cesariana. 3% (n=7) das mães foi internada em terapia intensiva devido a complicações na gravidez. Em relação aos recém-nascidos, 86,5% (n=211) tiveram contato com a mãe no primeiro dia de vida, sendo a principal causa de internação em terapia intensiva a falta de cuidador. O teste PCR foi realizado em todos sem detecção de transmissão vertical. Em 36,48% (n=89) a internação foi superior a três dias. Foi registrado um único óbito neonatal por prematuridade extrema. 19,67% (n=48) foram amamentados exclusivamente durante a internação. Conclusões: a pandemia afetou o atendimento inicial do binômio mãe-filho. Não se registrou um aumento do número de cesáreas, porém observou-se diminuição do aleitamento materno exclusivo, prolongamento da internação e aumento das internações em unidades de terapia intensiva sem detecção de contágio em recém-nascidos.

Tree age and cultivar-oriented use of mineral oil added to fungicide tank mixture for the control of citrus black spot in sweet orange orchards.

BACKGROUND: Mineral oil added to fungicide spray mixtures has been a frequently used strategy to control citrus black spot (CBS) worldwide. Although mineral oil may increase the efficacy of control, its use represents around 15% of the costs of a CBS spray program. This study aimed to assess the performance of different proportions of mineral oil added to a fungicide tank mixture for CBS control in young (less than 10 years old) and old (more than 12 years old) sweet orange orchards of early ('Hamlin'), mid-season ('Pera') and late-maturing ('Valencia') cultivars in São Paulo state, Brazil. The efficacy of 0.15%, 0.20% or 0.25% mineral oil added to a fungicide spray mixture was determined by assessing CBS incidence, severity and fruit drop in six orchards over two seasons. RESULTS: Fungicide programs with or without oil were effective in reducing 100% CBS symptom expression in both young and old 'Hamlin' orchards and in the young 'Pera' orchard. The lowest mineral oil rate tested (0.15%) showed a reduction in CBS intensity of around 90%, similar to the highest rate tested in the old 'Pera' orchard. The highest cost-benefit program to control CBS in the old 'Valencia' orchard was obtained with the mineral oil rate of 0.25%, commonly used in the São Paulo citrus belt, which reduced CBS severity by up to 97%. CONCLUSION: This study demonstrated that mineral oil rates for CBS control can be adjusted according to tree age and cultivar. These findings contribute to the establishment of more sustainable citrus production by reducing spray costs while maintaining the efficacy of CBS control. © 2021 Society of Chemical Industry.

Landscape barriers to pollen and seed flow in the dioecious tropical tree Astronium fraxinifolium in Brazilian savannah.

Gene flow studies provide information on gene exchange between populations, which is essential for developing genetic conservation strategies. Such analyses enable a better understanding of the life history and seed and pollen dispersal mechanisms of plant species. In this study, we investigate pollen and seed flow in a regenerant population of the pioneer species Astronium fraxinifolium in an area degraded during the construction of a hydroelectric dam. We mapped, sampled, sexed, and genotyped 386 individuals in the regenerant population (RP), as well as 128 adult trees located along two highways adjacent to the degraded area; one in Mato Grosso do Sul State (MS) and other in São Paulo State (SP). Parentage analyses was carried out for 370 individuals of the RP population, using as putative parents 348 individuals from RP and all 128 individuals sampled in MS and SP. Based on parentage analysis and eight microsatellite loci, our analyses revealed that for individuals of the RP with an identified father (pollen donor), 1.1% of the pollen was dispersed up to 532 m, while for those with an identified mother (seed donor), 0.5% of seeds were dispersed up to 4,782 m. However, a large proportion of pollen (76.5%) and seeds (57%) immigrated from trees outside the sampled populations. Pollen and seeds were dispersed through a pattern of isolation by distance. Genetic diversity was significantly similar between adults of both highway populations and individuals from RP, with significant levels of inbreeding detected only in RP. Our results demonstrate that the nearest trees contributed pollen and seeds for the recovery of the degraded area, indicating reproductive spatial isolation among the sampled populations due to the damming of the river. Such results help to understand the process of regeneration for A. fraxinifolium in regenerant populations to inform strategies for conservation and environmental recovery with this species.

Complete chloroplast genome of Myracrodruon urundeuva and its phylogenetics relationships in Anacardiaceae family.

Continuous exploratory use of tree species is threatening the existence of several plants in South America. One of these threatened species is Myracroduron urundeuva, highly exploited due to the high quality and durability of its wood. The chloroplast (cp) has been used for several evolutionary studies as well traceability of timber origin, based on its gene sequences and simple sequence repeats (SSR) variability. Cp genome organization is usually consisting of a large single copy and a small single copy region separated by two inverted repeats regions. We sequenced the complete cp genome from M. urundeuva based on Illumina next-generation sequencing. Our results show that the cp genome is 159,883 bp in size. The 36 SSR identified ranging from mono- to hexanucleotides. Positive selection analysis revealed nine genes related to photosystem, protein synthesis, and DNA replication, and protease are under positive selection. Genome comparison a other Anacardiaceae chloroplast genomes showed great variability in the family. The phylogenetic analysis using complete chloroplast genome sequences of other Anacardiaceae family members showed a close relationship with two other economically important genera, Pistacia and Rhus. These results will help future investigations of timber monitoring and population and evolutionary studies. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1007/s12298-021-00989-1.

Detection and application of novel SSR markers from transcriptome data for Astronium fraxinifolium Schott, a threatened Brazilian tree species.

Astronium fraxinifolium is an endangered tree species from Brazil. Due to its significance in environmental reforestation, as well as the continued exploitation of its wood, it is necessary to develop management programs that support the conservation of the species. Simple sequence repeats (SSR) or microsatellite markers are widely used in population genetic studies across a range of diverse organisms. In this study, we present the first SSR markers developed for A. fraxinifolium as well as their frequency and distribution based on transcriptome data. From transcriptome data, we identified more than 100 thousand sequences presenting microsatellites, with a predominant distribution of trinucleotide repeats. From the initial screening, we selected 20 microsatellite loci which were validated and evaluated for genetic indices in two natural populations. All loci were polymorphic, ranging from four to 11 alleles per locus. The observed and expected heterozygosities ranged from 0 to 1.0 and from 0.533 to 1.0, respectively, while the genetic differentiation (GST = 0.363) was greater within than between populations. The developed SSR loci from RNA-Seq data provides a foundation for future studies on genetic diversity and population structure, mating system, and gene flow for A. fraxinifolium populations and related species, aiming at conservation and management.

Arbovirus en Uruguay, un problema potencial. Revisión desde una óptica perinatal / Arbovirus in Uruguay, a potential problem. Review from a perinatal perspective / Arbovírus no Uruguai, um problema potencial. Revisão a partir de uma perspectiva perinatal

Resumen: Los arbovirus son microorganismos transmitidos al ser humano por artrópodos. Existen más de 100 tipos de arbovirus, con una presentación clínica común para todos ellos de fiebre, síntomas articulares, hemorrágicos y neurológicos1. Además, representan un riesgo particular para la mujer embarazada y el feto por el potencial teratogénico que algunos de ellos presentan, particularmente a nivel del sistema nervioso central. Utilizando los motores de búsqueda de Pubmed y de Google Scholar, realizamos una búsqueda bibliográfica enfocada a los arbovirus en general y luego enfocada en cada una de las patologías específicas abordadas, que fueron definidas en función del riesgo de ingreso a nuestro país y sus potenciales consecuencias. El objetivo de esta revisión es analizar las principales características de presentación de los arbovirus, en particular dengue, zika, chikungunya y fiebre amarilla ante la eventualidad de la aparición de casos de transmisión vertical, para que nuestros recursos humanos especializados tengan un marco de referencia del manejo actualizado. Esta revisión nos permitió concluir sobre los elementos comunes de estas virosis, así como sus potenciales afectaciones en el feto y en el recién nacido, y nos planteó el desafío vinculado a su dificultad diagnóstica por las reacciones cruzadas.

Summary: Arbovirus are microorganisms transmitted to humans through arthropods. There are more than 100 different arboviruses with a common clinical presentation of fever, articular, hemorrhagic and neurological symptoms1. They represent a mayor risk to pregnant women and fetuses due to their teratogenic effect, particularly affecting the central nervous system. We performed a specific search focused on arbovirus using search engines Pubmed and Google Scholar and we classified evidence according to the risk of a certain virus entering our country and its potential consequences. The objective of this review is to update the main clinical characteristics of arbovirus, particularly Dengue, Zika, Chikungunya and Yellow Fever particularly due to the potential introduction of these viruses in our country and the possibility of vertical transmission, so that our human resources have a guide on how to approach these patients nowadays. This review allowed us to conclude on common characteristics of these viruses, their possible consequences on fetus and newborns, and concluding on the difficulty of etiological diagnosis due to cross reactions.

Resumo: Os arbovírus são microrganismos transmitidos ao homem por artrópodes. Existem mais de 100 tipos de arbovírus, com apresentação clínica comum a todos eles de febre, sintomas articulares, hemorrágicos e neurológicos1. Além disso, representam um risco particular para a gestante e para o feto devido ao potencial teratogênico que alguns deles apresentam, principalmente ao nível do sistema nervoso central. Realizamos uma busca bibliográfica utilizando Pubmed e Google Scholar sobre arbovírus em geral e posteriormente, sobre cada uma das patologias específicas abordadas que foram definidas de acordo com o risco de entrada em nosso país e suas possíveis consequências. O objetivo desta revisão é analisar as principais características de apresentação dos arbovírus, em particular dengue, Zika, Chikungunya e febre amarela, considerando a possibilidade de casos de transmissão vertical, para servir como uma referência atualizada para os profissionais especializados nesta área. Esta revisão permitiu elaborar conclusões sobre os elementos comuns a esses vírus, bem como suas possíveis afetações no feto e no recém-nascido, e apresentou o desafio relacionado à dificuldade diagnóstica devido às reações cruzadas.

Disgenesia tubular renal en el Centro Hospitalario Pereira Rosell / Renal tubular dysgenesia at the Pereira Rossell Children Hospital / Disgenesia tubular renal no Centro Hospitalar Pereira Rossell

Resumen: La disgenesia tubular renal es una enfermedad adquirida o hereditaria autosómica recesiva. Se manifiesta durante la etapa fetal como oligoamnios por anuria fetal y en el recién nacido como anuria persistente, hipoplasia pulmonar, hipotensión severa refractaria y alteración de la osificación de los huesos craneales. Histológicamente es una alteración del desarrollo de los túbulos renales. Se expone un caso clínico de un recién nacido que presentó al nacer insuficiencia renal, múltiples dismorfias e hipoplasia pulmonar, falleciendo a los tres días de vida. La necropsia consigna el diagnóstico de disgenesia tubular renal.

Summary: Renal tubular dysgenesis is an acquired or inherited autosomal recessive disease. Before birth, it shows as oligohydramnios resulting from fetal anuria and after birth, it shows as persistent anuria, pulmonary hypoplasia, severe refractory hypotension and alteration of the ossification of the cranial bones. Histologically, it is an alteration of the development of the renal tubules. We hereby introduce a clinical case of a newborn who presented renal failure, multiple dysmorphia and pulmonary hypoplasia at birth, who died at 3 days of age and whose autopsy showed renal tubular dysgenesis.

Resumo: A disgenesia tubular renal é uma doença autossômica recessiva adquirida ou herdada. Manifesta-se durante o estágio fetal como oligoâmnio causado pela anúria fetal e no recém-nascido como anúria persistente, hipoplasia pulmonar, hipotensão grave refratária e alteração da ossificação dos ossos cranianos. Histologicamente, é uma alteração do desenvolvimento dos túbulos renais. Apresentamos um caso clínico de um recém-nascido que apresentou insuficiência renal, dismorfias múltiplas e hipoplasia pulmonar ao nascer, falecido aos 3 dias de vida e cuja autópsia estabelece o diagnóstico de disgenesia tubular renal.

Recién nacidos hijos de madres con tuberculosis. Serie de casos clínicos / Newborns of mothers with tuberculosis, a series of clinical cases / Crianças recém nascidas de mães com tuberculose. Série de relatos de casos clínicos

Resumen: La tuberculosis es un grave problema de salud pública en la región de las Américas. Uruguay no es ajeno a esta realidad, observándose un aumento sostenido de la tuberculosis en los últimos diez años, con una significativa letalidad producto de la presentación de formas evolucionadas y de la coinfección con el virus de la inmunodeficiencia humana (VIH). Esta situación repercute sobre la salud perinatal, destacándose como población de mayor riesgo las gestantes de mal medio socioeconómico, consumidoras de drogas psicoactivas y con coinfección por VIH. Se presenta una serie de cuatro casos clínicos de recién nacidos hijos de mujeres con tuberculosis activa al momento del nacimiento en el período comprendido entre enero de 2015 y junio de 2019 asistidos en el Centro Hospitalario Pereira Rossell, configurando una incidencia de 0,15 casos por cada 1.000 nacidos vivos. Tres de ellas eran portadoras de VIH con carga viral detectable al momento del nacimiento debido a mala adhesión al tratamiento antirretroviral. No se detectó resistencia a los fármacos antituberculosos. Con respecto a los recién nacidos, no se confirmó ningún caso de tuberculosis congénita. Se tomaron las medidas de aislamiento de contacto y se les realizaron las pruebas de primer nivel para el diagnóstico de tuberculosis congénita, resultando todas negativas.

Summary: Tuberculosis is a serious public health issue in the Americas. Uruguay is no stranger to this reality, and it has shown a steady increase in tuberculosis in the last 10 years, with significant mortality rates as a result of evolved forms of TB and of co-infection with Human Immunodeficiency Virus. This situation has consequences on perinatal health, and the population at highest risk is made up of pregnant women from poor socioeconomic backgrounds, users of psychoactive drugs with HIV co-infection. We hereby present a series of 4 clinical cases of newborns born to women with active tuberculosis at birth from January 2015 to June 2019 assisted at the Pereira Rossell Hospital Center, with an incidence of 0.15 cases for every 1 000 live births. Three of them were carriers of human immunodeficiency virus with a detectable viral load at birth due to poor compliance with the antiretroviral treatment. No resistance to anti-tuberculosis drugs was detected. Regarding newborns, no case of congenital tuberculosis was confirmed. Isolation measures were implemented and first-level tests were performed for the diagnosis of congenital tuberculosis, all of which were negative.

Resumo: A tuberculose é um grave problema de saúde pública nas Américas. O Uruguai não é estranho a esta realidade, tem registrado um aumento sustentado da tuberculose nos últimos 10 anos, com uma mortalidade significativa em decorrência da apresentação de formas evoluídas da TB e da coinfecção com o Vírus da Imunodeficiência Humana. Essa situação repercute na saúde perinatal e a população de maior risco é as gestantes de baixa condição socioeconômica, usuárias de drogas psicoativas e a coinfecção pelo HIV. Apresentamos uma série de 4 casos clínicos de recém-nascidos filhos de mulheres com tuberculose ativa no momento do parto no período de janeiro de 2015 a junho de 2019 atendidos no Centro Hospitalar Pereira Rossell, com uma incidência de 0,15 casos por 1 000 nascidos vivos. Três deles eram portadores do vírus da imunodeficiência humana com carga viral detectável ao nascimento devido à baixa adesão ao tratamento antirretroviral. Não se detectou resistência aos medicamentos antituberculose. Em relação aos recém-nascidos, não se confirmou nenhum caso de tuberculose congênita. Realizaram-se medidas de isolamento de contato e exames de primeiro nível para o diagnóstico de tuberculose congênita, todos negativos.

Serie de casos de pacientes con infección connatal a citomegalovirus sintomática en el Servicio de Recién Nacidos del Centro Hospitalario Pereira Rossell / Case studies of patients with connatal symptomatic cytomegalovirus infection at the Pereira Rossell Children Hospital / Relatos de casos de pacientes com infecção por citomegalovírus sintomático congênito no Centro Pediátrico Pereira Rossell

Resumen: Introducción: la citomegalovirosis es la infección connatal con mayor prevalencia y la causa más frecuente de sordera neurosensorial de origen no genético. Es una patología mayormente asintomática hasta en 90% de los casos. Existen en nuestro país escasos datos sobre la epidemiología de esta enfermedad. Objetivo: conocer el perfil epidemiológico de la citomegalovirosis connatal sintomática en el Centro Hospitalario Pereira Rossell. Material y método: estudio descriptivo, transversal, longitudinal. Fuente de datos: historias clínicas electrónicas del servicio. Criterios de inclusión: neonatos hospitalizados entre el 1/1/2010 y el 31/12/2018 con reacción en cadena de polimerasa (PCR) para citomegalovirus positiva en orina, saliva o sangre en las primeras tres semanas de vida y al menos una manifestación clínica o paraclínica. Resultados: 19 pacientes cumplieron los criterios establecidos. Incidencia 0,2/1000 nacidos vivos. Fallecieron dos pacientes. El diagnóstico fue realizado por PCR en sangre o en orina. Las manifestaciones clínicas más frecuentes fueron pacientes pequeños para la edad gestacional, microcefalia y hepatoesplenomegalia. Alteraciones paraclínicas: alteraciones imagenológicas del sistema nervioso central, alteraciones hematológicas y alteraciones del hepatograma. El tratamiento fue iniciado en todos los casos con ganciclovir, pero heterogéneo en la duración y continuación. Conclusiones: los hallazgos en cuanto a prevalencia de citomegalovirosis connatal sintomática, manifestaciones clínicas y paraclínicas son coincidentes con la bibliografía internacional. Es fundamental la creación de un protocolo de manejo del paciente con citomegalovirosis connatal.

Summary: Introduction: cytomegalovirus is a greatly prevalent connatal infection and it is the most common cause of non-genetic sensorineural hearing loss. Mostly, in up to 90% of the cases, is asymptomatic. There is few data in Uruguay regarding its epidemiology. Objective: to learn about the symptomatic connatal cytomegalovirus epidemiological profile at the Pereira Rossell Children Hospital. Materials and methods: descriptive transversal longitudinal study. Source of data: electronic medical records. Selection criteria: hospitalized newborns between Jan 1, 2010 and Dec 31,2018 showing a polymerase chain reaction (PCR) for positive cytomegalovirus in urine, saliva or blood during the first 3 weeks of life and at least one clinical or paraclinical reaction. Results: 19 patients met the criteria. Incidence: 0,2/1000 of live newborns. Two patients died. A blood or urine PCR test was carried out. The most common clinical symptoms were: small-sized babies for their gestational age, microcephaly, hepatosplenomegaly. Paraclinical alterations: imagological SNC alterations, hematological alterations and hepatogram alterations. Ganciclovir treatment was started in every case, but treatment duration and continuity were heterogeneous. Conclusions: the findings regarding symptomatic connatal cytomegalovirus prevalence and their clinical and paraclinical symptoms met the international literature findings. It is essential to create a patient management protocol for patients with connatal cytomegalovirus.

Resumo: Introdução: o citomegalovírus é uma infecção congênita muito prevalente e é a causa mais comum de perda auditiva neurossensorial não genética. É principalmente assintomático, em até 90% dos casos. Existem poucos dados no Uruguai sobre a sua epidemiologia. Objetivo: conhecer o perfil epidemiológico do citomegalovírus congênito sintomático no Hospital Pediátrico Pereira Rossell. Materiais e métodos: estudo longitudinal transversal descritivo. Fonte dos dados: prontuários eletrônicos. Critérios de seleção: recém-nascidos hospitalizados entre 1º de janeiro de 2010 e 31 de dezembro de 2018 que mostraram uma reação em cadeia da polimerase (PCR) para citomegalovírus positivo na urina, saliva ou sangue durante as primeiras 3 semanas de vida e pelo menos uma reação clínica ou para clínica. Resultados: 19 pacientes preencheram os critérios. Incidência: 0,2/1000 de recém-nascidos vivos. Dois pacientes morreram. Foi realizado um teste de PCR no sangue ou na urina. Os sintomas clínicos mais comuns foram: crianças de pequeno porte para a idade gestacional, microcefalia, hepatoesplenomegalia. Alterações para clínicas: alterações hematológicas, alterações no hepatograma e alterações imagiológicas do SNC. O tratamento com Ganciclovir foi iniciado em todos os casos, mas a duração e a continuidade do tratamento foram heterogêneas. Conclusões: os resultados referentes à prevalência de citomegalovírus congênito sintomático, assim como os sintomas clínicos e para clínicos concordaram com aquilos achados da literatura internacional. É essencial criar um protocolo de gerenciamento para pacientes com citomegalovírus congênito.

Hiperinsulinismo congénito por mutación del gen ABCC8 / Congenital hyperinsulinism due to the ABCC8 gene mutation / Hiperinsulinismo congênito causado por mutação do gen ABCC8

Resumen: El hiperinsulinismo congénito es la causa más común de hipoglucemia persistente en el recién nacido y la infancia, con un alto riesgo de daño neurológico irreversible. En los últimos años, gracias a los avances en el conocimiento de la genética molecular, se ha avanzado y profundizado en sus bases genéticas; sin embargo, el diagnóstico se sigue realizando en muchas ocasiones demasiado tarde, dada la heterogeneidad que presenta esta enfermedad. Se detalla a continuación el caso de una paciente con hipoglicemias de difícil control desde el nacimiento, secundaria a hiperinsulinismo congénito y en cuyo estudio genético se evidenció mutación del gen ABCC8.

Summary: Congenital hyperinsulinism (CH) is the most common cause of persistent hypoglycemia in newborns and children at a high risk of irreversible neurological damage. In spite of the recent progress made by the molecular genetics' genetic base, diagnosis is still often late, given the heterogeneity of this disease. We hereby report the case of a patient ranging from secondary and difficult to control hypoglycemia to congenital hyperinsulinemia. Her genetic test showed ABCC8 gene mutation.

Resumo: O hiperinsulinismo congênito (HC) é a causa mais comum de hipoglicemia persistente em recém-nascidos e crianças com alto risco de dano neurológico irreversível. Apesar dos recentes progressos realizados pela base genética da genética molecular, o diagnóstico ainda é frequentemente realizado tarde demais, dada a heterogeneidade dessa doença. Relatamos o caso duma paciente que varia de hipoglicemia secundária e de difícil controle a hiperinsulinemia congênita. Seu teste genético mostrou mutação no gene ABCC8.

[Incidence of group B streptococcal early-onset sepsis in infants born at Centro Hospitalario Pereira Rossell between 2007-2015]. / Incidencia de sepsis precoz por Streptococcus agalactiae en recién nacidos del Centro Hospitalario Pereira Rossell en el período 2007-2015.

BACKGROUND: Group B Streptococcus (GBS) disease remains the leading cause of early-onset sepsis (EOS) in developed countries despite effective prophylaxis strategies. AIMS: To describe the incidence, clinical features and mortality of GBS EOS in infants born at Centro Hospitalario Pereira Rossell (CHPR) and analyse failure of adherence to prevention strategies. METHODS: Retrospective review of EOS cases between 2007 and 2015 collected from the bacteriology laboratory database. RESULTS: Fifteen cases of GBS EOS were identified, with an incidence of 0.23% during the study period. Intrapartum antibiotic prophylaxis (IAP) was not administered in any of the cases. All infants were symptomatic within the first 15 hours of life, mainly due to respiratory signs (80%). In one case, GBS was isolated from spinal fluid. Mortality rate was 20%. All deaths occurred in the first 24 hours of life, corresponding two thirds to preterm infants. CONCLUSION: The incidence of GBS EOS at CHPR was similar to other centers where IAP is implemented. Better adherence to prophylaxis strategies could reduce the incidence.

Long-distance pollen and seed dispersal and inbreeding depression in Hymenaea stigonocarpa (Fabaceae: Caesalpinioideae) in the Brazilian savannah.

Hymenaea stigonocarpa is a neotropical tree that is economically important due to its high-quality wood; however, because it has been exploited extensively, it is currently considered threatened. Microsatellite loci were used to investigate the pollen and seed dispersal, mating patterns, spatial genetic structure (SGS), genetic diversity, and inbreeding depression in H. stigonocarpa adults, juveniles, and open-pollinated seeds, which were sampled from isolated trees in a pasture and trees within a forest fragment in the Brazilian savannah. We found that the species presented a mixed mating system, with population and individual variations in the outcrossing rate (0.53-1.0). The studied populations were not genetically isolated due to pollen and seed flow between the studied populations and between the populations and individuals located outside of the study area. Pollen and seed dispersal occurred over long distances (>8 km); however, the dispersal patterns were isolated by distance, with a high frequency of mating occurring between near-neighbor trees and seeds dispersed near the parent trees. The correlated mating for individual seed trees was higher within than among fruits, indicating that fruits present a high proportion of full-sibs. Genetic diversity and SGS were similar among the populations, but offspring showed evidence of inbreeding, mainly originating from mating among related trees, which suggests inbreeding depression between the seed and adult stages. Selfing resulted in a higher inbreeding depression than mating among relatives, as assessed through survival and height. As the populations are not genetically isolated, both are important targets for in situ conservation to maintain their genetic diversity; for ex situ conservation, seeds can be collected from at least 78 trees in both populations separated by at least 250 m.

Incidencia de sepsis precoz por Streptococcus agalactiae en recién nacidos del Centro Hospitalario Pereira Rossell en el período 2007-2015 / Incidence of group B streptococcal early-onset sepsis in infants born at Centro Hospitalario Pereira Rossell between 2007-2015

Resumen Introducción La infección por Streptococcus agalactiae (β-hemolítico del grupo B (SGB) continúa siendo una de las principales causas de sepsis precoz en países desarrollados a pesar de la implementación de profilaxis efectiva. Objetivos Describir la incidencia, características clínicas y mortalidad de sepsis precoz por SGB en recién nacidos del Centro Hospitalario Pereira Rossell (CHPR), y analizar las fallas de adherencia a las estrategias de prevención. Métodos Estudio retrospectivo de descripción de casos entre los años 2007 a 2015 identificados a partir de la base de datos del laboratorio de bacteriología. Resultados Se identificaron 15 casos de sepsis neonatal precoz a SGB con una incidencia en el período de estudio de 0,23‰. La quimioprofilaxis intraparto no fue realizada en caso alguno. Todos los recién nacidos se presentaron sintomáticos en las primeras 15 h de vida. La dificultad respiratoria fue el signo más frecuente (80%). En un caso se aisló SGB de líquido cefalorraquídeo. La mortalidad fue de 20%. Todas las muertes ocurrieron en las primeras 24 h de vida, siendo dos tercios prematuros. Conclusión La incidencia de sepsis precoz por SGB en el CHPR fue similar a la incidencia en centros donde se realiza quimioprofilaxis. Una mejor adherencia a las estrategias de prevención podría disminuir la incidencia.

Background: Group B Streptococcus (GBS) disease remains the leading cause of early-onset sepsis (EOS) in developed countries despite effective prophylaxis strategies. Aims: To describe the incidence, clinical features and mortality of GBS EOS in infants born at Centro Hospitalario Pereira Rossell (CHPR) and analyse failure of adherence to prevention strategies. Methods: Retrospective review of EOS cases between 2007 and 2015 collected from the bacteriology laboratory database. Results: Fifteen cases of GBS EOS were identified, with an incidence of 0.23% during the study period. Intrapartum antibiotic prophylaxis (IAP) was not administered in any of the cases. All infants were symptomatic within the first 15 hours of life, mainly due to respiratory signs (80%). In one case, GBS was isolated from spinal fluid. Mortality rate was 20%. All deaths occurred in the first 24 hours of life, corresponding two thirds to preterm infants. Conclusion: The incidence of GBS EOS at CHPR was similar to other centers where IAP is implemented. Better adherence to prophylaxis strategies could reduce the incidence.

Linkage Disequilibrium and Population Structure in Wild and Cultivated Populations of Rubber Tree (Hevea brasiliensis).

Among rubber tree species, which belong to the Hevea genus of the Euphorbiaceae family, Hevea brasiliensis (Willd. ex Adr.de Juss.) Muell. Arg. is the main commercial source of natural rubber production worldwide. Knowledge of the population structure and linkage disequilibrium (LD) of this species is essential for the efficient organization and exploitation of genetic resources. Here, we obtained single-nucleotide polymorphisms (SNPs) using a genotyping-by-sequencing (GBS) approach and then employed the SNPs for the following objectives: (i) to identify the positions of SNPs on a genetic map of a segregating mapping population, (ii) to evaluate the population structure of a germplasm collection, and (iii) to detect patterns of LD decay among chromosomes for future genetic association studies in rubber tree. A total of 626 genotypes, including both germplasm accessions (368) and individuals from a genetic mapping population (254), were genotyped. A total of 77,660 and 21,283 SNPs were detected by GBS in the germplasm and mapping populations, respectively. The mapping population, which was previously mapped, was constructed with 1,062 markers, among which only 576 SNPs came from GBS, reducing the average interval between two adjacent markers to 4.4 cM. SNPs from GBS genotyping were used for the analysis of genetic structure and LD estimation in the germplasm accessions. Two groups, which largely corresponded to the cultivated and wild populations, were detected using STRUCTURE and via principal coordinate analysis. LD analysis, also using the mapped SNPs, revealed that non-random associations varied along chromosomes, with regions of high LD interspersed with regions of low LD. Considering the length of the genetic map (4,693 cM) and the mean LD (0.49 for cultivated and 0.02 for wild populations), a large number of evenly spaced SNPs would be needed to perform genome-wide association studies in rubber tree, and the wilder the genotypes used, the more difficult the mapping saturation.