Diversity, Genomics and Symbiotic Characteristics of Sinorhizobia That Nodulate Desmanthus spp. in Northwest Argentina.

Desmanthus spp. are legumes with the ability to associate with diverse α-proteobacteria-a microsymbiont-in order to establish nitrogen-fixing root nodules. A previous investigation from our laboratory revealed that the main bacteria associated with Desmanthus paspalaceus in symbiosis in central Argentina (Province of Santa Fe) were quite diverse and belonged to the genera Rhizobium and Mesorhizobium. To achieve a more extensive view of the local microsymbionts associated with Desmanthus spp., we sampled three different sites in Jujuy and Salta, in northwest Argentina. Matrix-assisted Laser-Desorption-Ionization Time-of-Flight mass spectrometry (MALDI-TOF) typing, 16S-rDNA analysis, and genome sequencing demonstrated that the dominant root-nodule microsymbionts belonged to the genus Sinorhizobium, with some sequenced genomes related to Sinorhizobium mexicanum, Sinorhizobium chiapanecum, and Sinorhizobium psoraleae. An analysis of nodA and nodC markers indicated that, in some of the isolates, horizontal gene transfer appeared to be responsible for the lack of congruence between the phylogenies of the chromosome and of the symbiotic region. These results revealed diverse evolutionary strategies for reaching the current Desmanthus-microsymbiont diversity. What is remarkable beside their observed genetic diversity is that the tolerance profiles of these isolates to abiotic stresses (temperature, salt concentration, pH) were quite coincident with the separation of the sinorhizobia according to place of origin, suggesting possible ecoedaphic adaptations. This observation, together with the higher aerial dry-weight matter that some isolates generated in Desmanthus virgatus cv. Marc when compared to the biomass generated by the commercial strain Sinorhizobium terangae CB3126, distinguish the collected sinorhizobia as constituting valuable germplasm for evaluation in local fields to select for more efficient symbiotic pairs.

Agro-physiological and soil microbial responses to desalinated seawater irrigation in two crops.

Irrigation with desalinated seawater (DSW) is a potential solution for addressing water scarcity in semiarid regions across the globe. However, this strategy may compromise the health of agricultural ecosystems due to the high content of phytotoxic elements (mainly boron, B) in this water. Here, a three-year experiment was carried to evaluate the response of the soil's physicochemical and microbiological properties, and plant physiology, to three irrigation water treatments (DSW; fresh water, FW; and their blend (1:1), BW) in the presence or not of organic amendments. Lemon trees (Citrus limon (L.) Burm. fil. cv. Eureka), with a higher sensitivity to B toxicity, and apricot trees (Prunus armeniaca L. cv. 'Búlida'), with a lower one, were used as model plants. Lemon trees irrigated with BW and DSW showed a decline in net photosynthesis and stomatal conductance, and an accumulation of B in leaves that exceeded the toxicity threshold. These effects were stronger in amended soils. In soils cultivated with lemon trees, DSW irrigation increased the water-soluble nitrogen content, the urease activity, and the activity and biomass of the microbial community, and shifted the microbial community structure as compared with the other water treatments. The soil microbial community responses were controlled by the addition of organic amendments. The irrigation of apricots with DSW did not negatively impact plant physiological parameters but increased the soil microbial biomass, as in the case of the lemon tree-soil system. These results suggest that DSW irrigation increases soil microbial biomass in both crop-soil systems but harms the physiological status of the most sensitive crop. Our findings provide an initial approach to evaluate the response of the plant-soil system to DSW.

The effects of ozone treatments on the agro-physiological parameters of tomato plants and the soil microbial community.

Ozone has been applied in many processes (drinking water disinfection and wastewater treatment, among others) based on its high degree of effectiveness as a wide-spectrum disinfectant and its potential for the degradation of pollutants and pesticides. Nevertheless, the effects of irrigation with ozonated water on the soil microbial community and plant physiology and productivity at the field scale are largely unknown. Here, we assessed the impact of irrigation with ozonated water on the microbial community of a Mediterranean soil and on Solanum lycopersicum L. agro-physiology and productivity in a greenhouse experiment. For this purpose, we evaluated: i) soil physicochemical properties, soil enzyme activities, and the biomass (through analysis of microbial fatty acids) and diversity (through 16S rRNA gene and ITS2 amplicon sequencing) of the soil microbial community, and ii) the nutrient content, physiology, yield, and fruit quality of tomato plants. Overall, the soil physicochemical properties were slightly affected by the treatments applied, showing some differences between continuous and intermittent irrigation with ozonated water. Only the soil pH was significantly reduced by continuous irrigation with ozonated water at the end of the assay. Biochemical parameters (enzymatic activities) showed no significant differences between the treatments studied. The biomasses of Gram- bacteria and fungi were decreased by intermittent and continuous irrigation with ozonated water, respectively. However, the diversity, structure, and composition of the soil microbial community were not affected by the ozone treatments. Changes in soil properties slightly affected tomato plant physiology but did not affect yield or fruit quality. The stomatal conductance was reduced and the intrinsic water use efficiency was increased by continuous irrigation with ozonated water. Our results suggest that soil health and fertility were not compromised, however ozonated water treatments should be tailored to individual crop conditions to avoid adverse effects.

Isohydricity of Two Different Citrus Species under Deficit Irrigation and Reclaimed Water Conditions.

Citrus species are frequently subjected to water and saline stresses worldwide. We evaluated the effects of diurnal changes in the evaporative demands and soil water contents on the plant physiology of grapefruit and mandarin crops under saline reclaimed (RW) and transfer (TW) water conditions, combined with two irrigation strategies, fully irrigated (fI) and non-irrigated (nI). The physiological responses were different depending on the species. Grapefruit showed an isohydric pattern, which restricted the use of the leaf water potential (Ψl) as a plant water status indicator. Its water status was affected by salinity (RW) and water stress (nI), mainly as the combination of both stresses (RW-nI); however, mandarin turned out to be relatively more tolerant to salinity and more sensitive to water stress, mainly because of its low hydraulic conductance (K) levels, showing a critical drop in Ψl that led to severe losses of root-stem (Kroot-stem) and canopy (Kcanopy) hydraulic conductance in TW-nI. This behavior was not observed in RW-nI because a reduction in canopy volume as an adaptive characteristic was observed; thus, mandarin exhibited more anisohydric behavior compared to grapefruit, but isohydrodynamic since its hydrodynamic water potential gradient from roots to shoots (ΔΨplant) was relatively constant across variations in stomatal conductance (gs) and soil water potential. The gs was considered a good plant water status indicator for irrigation scheduling purposes in both species, and its responses to diurnal VPD rise and soil drought were strongly correlated with Kroot-stem. ABA did not show any effect on stomatal regulation, highlighting the fundamental role of plant hydraulics in driving stomatal closure.

Effect of Pisolithus tinctorious on Physiological and Hormonal Traits in Cistus Plants to Water Deficit: Relationships among Water Status, Photosynthetic Activity and Plant Quality.

Cistus species can form ectomycorrhizae and arbuscular mycorrhizal fungus that can bring benefits when plants are under water stress conditions. However, the application of some ectomycorrhizae on the water uptake under drought through physiological traits and hormonal regulation is less known. The experiment was performed during three months in a growth chamber with Cistus albidus plants in which the combined effect of the ectomycorrhiza Pisolithus tinctorious inoculation and two irrigation treatments (control and water-stressed plants) were applied. Irrigation absence caused significant decrease in aerial growth and tended to decrease soil water potential at the root surface, leading to a decrease in leaf water potential. Under these conditions, the abscisic acid and salicylic acid content increased while the precursor of ethylene decreased. Although the mycorrhization percentages were not high, the inoculation of P. tinctorious improved the water status and slightly cushioned the rise in leaf temperature of water-stressed plants. The ectomycorrhiza decreased the scopoletin values in leaves of plants subjected to deficit irrigation, indicating that inoculated plants had been able to synthesize defense mechanisms. Therefore, Pisolithus tinctorious alleviated some of the harmful effects of water scarcity in Cistus plants, being its use a sustainable option in gardening or restoration projects.

Plant and soil microbial community responses to different water management strategies in an almond crop.

Climate change is one of the main challenges facing the agricultural sector as it strives to meet global food needs. In arid and semiarid areas, the scarcity of water imposes the use of alternative sources - such as reclaimed water (RW) or desalinated water (DW) - and of deficit irrigation strategies, such as regulated deficit irrigation (RDI), in order to maintain productivity. The impact of both alternative water sources and RDI strategies on soil microbial communities in conjunction with the crop response has been little studied, and far less in fruit trees. Here, we evaluated the effects of the irrigation water quantity (RDI or the optimal water amount) and quality (DW or saline RW) on: i) the biomass, composition, and activity of the soil microbial community, and ii) the plant agro-physiological response at the level of the water status, nutrients, vegetative growth, and yield of almond trees. The DW-RDI treatment had a lower vegetative growth than the rest, reducing the nutrient requirements and increasing the contents of organic carbon and nitrogen in soil. This coincided with a significant increase in the bacterial biomass and enzyme activities in soil, as well as with a decrease in plant nutrient use efficiencies and yield. Irrigation with RW increased the fungal biomass. When there were no water restrictions (RW-FI), none of the plant agro-physiological parameters were affected; when RDI was applied (RW-RDI), the highest soil sodicity was reached and vegetative growth and yield were negatively affected, although the plant nutrient use efficiencies did not decrease as much as with DW-RDI. In addition, the plant nutrient use efficiencies were negatively correlated with the soil enzyme activities. These results improve our knowledge of the functioning of plant-soil interactions in Mediterranean crops subjected to different irrigation strategies.

Combined ozonation and solarization for the removal of pesticides from soil: Effects on soil microbial communities.

Pesticides have been used extensively in agriculture to control pests and soil-borne diseases. Most of these pesticides can persist in soil in harmful concentrations due to their intrinsic characteristics and their interactions with soil. Soil solarization has been demonstrated to enhance pesticide degradation under field conditions. Recently, ozonation has been suggested as a feasible method for reducing the pesticide load in agricultural fields. However, the effects of ozonation in the soil microbial community have not been studied so far. Here, we evaluate the combined effects of solarization and ozonation on the microbial community of a Mediterranean soil. For this purpose, soil physico-chemical characteristics and enzyme activities and the biomass (through analysis of microbial fatty acids) and diversity (through 16S rRNA and ITS amplicon sequencing) of soil microbial communities were analyzed in a 50-day greenhouse experiment. The degradation of the pesticides was increased by 20%, 28%, and 33% in solarized soil (S), solarized soil with surface ozonation (SOS), and solarized soil with deep ozonation (SOD), respectively, in comparison to control (untreated) soil. Solarization and its combination with ozonation (SOS and SOD) increased the ammonium content as well as the electrical conductivity, while enzyme activities and soil microbial biomass were negatively affected. Despite the biocidal character of ozone, several microbial populations with demonstrated pesticide-degradation capacity showed increases in their relative abundance. Overall, the combination of solarization plus ozone did not exacerbate the effects of solarization on the soil chemistry and microbial communities, but did improve pesticide degradation.

Genome sequence of Bradyrhizobium yuanmingense strain P10 130, a highly efficient nitrogen-fixing bacterium that could be used for Desmodium incanum inoculation.

Strain P10 130, an isolated Bradyrhizobium strain from Argentina which promotes the growth of the leguminous plant Desmodium incanum by different mechanisms was previously selected as the best candidate for D. incanum inoculation based on broader selective criteria. A close relationship between this strain and B. yuanmingense was determined by MALDI BioTyper identification and 16S rRNA gene phylogenetic analysis. This study aimed to analyse the genome sequence of B. yuanmingense P10 130 in order to deepen our knowledge regarding its plant growth-promoting traits and to establish its phylogenetic relationship with other species of Bradyrhizobium genus. The genome size of strain P10 130 was estimated to be 7.54 Mb that consisted of 65 contigs. Genome Average Nucleotide Identity (ANI) analysis revealed that B. yuanmingense CCBAU 10071 T was the closest strain to P10 130 with ca. 96% identity. Further analysis of the genome of B. yuanmingense P10 130 identified 20 nod/nol/NOE, 14 nif/18 fix, 5 nap/5 nor genes, which may be potentially involved in nodulation, nitrogen fixation, and denitrification process respectively. Genome sequence of B. yuanmingense P10 130 is a valuable source of information to continue the research of its potential industrial production as a biofertilizer of D. incanum.

Conflictos del cirujano: ¿La vocación quirúrgica está en crisis? / Conflicts of surgeons: is surgical vocation in crisis?

RESUMEN Introducción: En los últimos años vemos un aumento de bibliografía que se refiere a problemas perso nales y psicológicos del cirujano, a la deserción en residencias de cirugía y a la falta de especialización de individuos jóvenes. Este aumento se observa sobre todo en revistas de jerarquía como Lancet o JAMA. ¿Pero cuál es la situación en la Argentina? ¿Consideramos que nos están pagando adecua damente por nuestra práctica? ¿Pensamos en abandonar nuestra especialidad? ¿Cuántos conflictos tenemos con pacientes por mes? Estimamos necesaria la realización de un trabajo regional que lo plasme. Objetivo: conocer la situación socioeconómica actual de los cirujanos. Material y métodos: estudio de corte transversal. Resultados: de 73 cirujanos encuestados de la provincia de Santa Fe, se recibió respuesta en un 57,5 %. El 87,8 % fueron hombres y 56,1% estaba dentro del grupo de edad adulto intermedio/mayor al momento del estudio. El 97,6 % de los cirujanos concordó en que sus ingresos no se corresponden con el tiempo invertido en la práctica. Consideraron abandonar su práctica diaria en el último año en un 26,2 %; la causa económica es el principal problema para el 72,7%. Discusión: la incomodidad del cirujano frente a su salario (97,6 %), la discrepancia de porcentajes en tre cirujanos y cirujanas (87,8% vs. 12,2%), la falta de cirujanos jóvenes (43,9%) y la alarmante cifra de cirujanos graduados por año (35 por año) son cuatro puntos clave que consideramos deberían abordar de manera urgente los entes políticos y, sobre todo, las Asociaciones de Cirugía.

ABSTRACT Background: In recent years we have witnessed more publications about personal and psychological issues affecting surgeons, residents quitting surgery residencies, and lack of specialization of young in dividuals. This growth can be observed especially in high-impact journals such as The Lancet or JAMA. But what is the situation in Argentina? Do we think that we are receiving adequate payment for our practice? Do we consider quitting our specialty? How many conflicts do we have with patients each month? We think that a regional work is necessary to reflect this situation. Objective: The aim of this study is to determine the current socioeconomic situation of surgeons. Material and methods: We conducted a cross-sectional study. Results: A total of 73 surgeons from the province of Santa Fe were contacted and 42 answers were received (response rate 57.5%): 87.8% were men and 56.1% corresponded to middle/older adulthood. Almost all surgeons (97.6%) agreed that their income did not reflect the time spent in practice. Up to 26.2% of survey respondents considered quitting their daily practice in the last year due to eco nomic reasons, which is the main problem for 72.7% of them. Discussion: Surgeons' discomfort with their salaries (97.6%), the discrepancy in percentages between male and female surgeons (87.8% vs. 12.2%), the lack of young surgeons (43.9%) and the alarming number of surgeons graduated per year (35 per year) are 4 key issues which we believe should be urgently addressed by political bodies and, especially, by surgery associations.

[Silent celiac disease in an obese patient with alopecia areata.] / Enfermedad celiaca silente en paciente obeso con alopecia areata.

Introduction: celiac disease is a medical condition that is characterized by its varied forms of clinical presentation and its association with other autoimmune pathologies. The objective is to describe the case of a patient who presented for consultation due to alopecia areata. Methodology: observational, descriptive, retrospective study of a 24-year-old obese male Results: among the routine studies positive serology for celiac disease was detected and confirmed with digestive endoscopy. Conclusions: the alopecia areata of this patient allowed to reveal another autoimmune disease.

Introducción: la enfermedad celiaca es una afección médica que se caracteriza por sus variadas formas de presentación clínica y por su asociación a otras patologías autoinmunes. Objetivo: describir caso de paciente que se presentó a consulta por alopecía areata. Metodología: estudio observacional, descriptivo, retrospectivo de varón obeso de 24 años Resultados: entre los estudios de rutina se detecta serología positiva para enfermedad celiaca que se confirma con endoscopía digestiva. Conclusiones: la alopecía areata de este paciente permitió detectar otra enfermedad autoinmune.

Características clínicas de la automedicación en adultos de tres Unidades de Salud Familiar de Paraguay en 2019

RESUMEN Introducción: la automedicación se define como la ingestión de medicamentos por iniciativa propia y sin receta médica. Esta práctica, que suele alcanzar cifras de prevalencia importantes, puede acarrear graves consecuencias a la salud de la población. Objetivos: describir las características de la automedicación en adultos de tres Unidades de Salud Familiar del Paraguay en el período agosto - septiembre del 2019. Metodología: estudio observacional, descriptivo y prospectivo en población adulta utilizando una entrevista estructurada previo consentimiento informado. Se midieron datos demográficos y variables relacionadas al consumo de medicamentos sin prescripción médica. Resultados: fueron estudiados 153 sujetos, de los cuales la edad media fue 43±17 años, con predominio del sexo femenino (77,2%). La situación laboral predominante fue quehaceres domésticos (39,2%). La mayoría (40%) tenía un nivel de escolaridad secundaria. En 101 casos (66%) se detectó algún grado de automedicación pues muchos admitieron ingerir más de un fármaco a la vez. La principal fuente de adquisición de los medicamentos fueron las farmacias (50%). La fuente de información del medicamento requerido para las afecciones de los sujetos estudiados fue principalmente el farmacéutico (37%). Los fármacos ingeridos con mayor frecuencia fueron los analgésicos (84%). El principal síntoma que motivo la automedicación fue el dolor (75%). Conclusión: la frecuencia de automedicación fue 66% predominando la ingesta de analgésicos y antipiréticos. Los síntomas que mayormente motivaron esta conducta fueron la fiebre y el dolor y la principal fuente de adquisición de los medicamentos fueron las farmacias.

ABSTRACT Introduction: Self-medication is defined as the ingestion of medications on their own initiative and without a prescription. This practice, which usually reaches significant prevalence figures, can have serious consequences for the health of the population. Objectives: To describe the characteristics of self-medication in adults of three Family Health Units of Paraguay in the period August - September 2019. Methodology: Observational, descriptive and prospective study in the adult population using a structured interview with prior informed consent. Demographic data and variables related to the consumption of non-prescription medications were measured. Results: One hundred and fifty-three subjects were studied, with a mean age of 43±17 years and female predominance (77.2%). The predominant employment situation was household chores (39.2%). The majority (40%) had high school level. In 101 cases (66%) some degree of self-medication was detected as many admitted to ingest more than one drug at a time. The main source of acquisition of drugs were pharmacies (50%). The source of information on the medication required for the conditions of the subjects studied was mainly the pharmacist (37%). The drugs most frequently ingested were analgesics (84%). The main symptom that caused self-medication was pain (75%). Conclusion: The frequency of self-medication was 66% predominating the intake of analgesics and antipyretics. The symptoms that mostly motivated this behavior were fever and pain and the main source of medication acquisition was pharmacies.

Medium-long term effects of saline reclaimed water and regulated deficit irrigation on fruit quality of citrus.

BACKGROUND: Non-conventional water sources and water-saving techniques can be valuable in semi-arid regions, although their long-term effects on citrus quality are little known. This study evaluated the effects of irrigation with two sources, transfer water (TW) and reclaimed water (RW), combined with two irrigation strategies, full irrigation (FI) and regulated deficit irrigation (RDI), on fruit quality of mandarins and grapefruits during eight growth seasons. RESULTS: Reclaimed water irrigation in mandarin, without water restriction, influenced maturity index (MI) less than TW-FI, because titratable acidity (TA) increased to a greater degree than soluble solid contents (SSC). Nevertheless, juice quality standards were satisfied. Regardless of the irrigation treatment (FI or RDI), a trend towards increasing fruit weight was also detected with RW. In grapefruit, its rootstock (Citrus macrophylla) enhanced salinity resilience with respect to the rootstock of mandarin ('Carrizo' citrange) and, hence, MI was not affected by RW. The RDI strategy, without saline stress (TW-RDI), increased, to a similar degree, both SSC and TA in mandarin fruit, not affecting the MI. In grapefruit, the water stress of RDI did improve the MI due to the TA did not change and SSC increased significantly, the TA did not change. The combination of both strategies, RW-RDI, decreased the MI only in some years because TA increased proportionally more than SSC in mandarin. CONCLUSIONS: The medium- and long-term feasibility of using RW and RDI to irrigate citrus was demonstrated. However, they must be performed cautiously and with appropriate management to avoid damaging fruit quality as a result of phytotoxic elements. © 2019 Society of Chemical Industry.

Factores de insatisfacción al alta de un servicio de Clínica Médica del Paraguay / Factors of dissatisfaction upon discharge from a Medical Clinic service of Paraguay

Introducción: los factores que influyen en la insatisfacción de los pacientes son diversos y varían con cada país y tipo de hospital. Objetivos: hallar la frecuencia y factores asociados a la insatisfacción en la atención referida por los pacientes. Materiales y métodos: se realizó una investigación cuantitativa con el cuestionario SERVQUAL aplicado al alta de los pacientes adultos del Servicio de Clínica Médica del Hospital Nacional durante los años 2018 y 2019. Con el cuestionario de recogieron variables demográficas, clínicas y las respuestas a 22 preguntas que evaluaron cinco dimensiones relacionadas a la satisfacción con el servicio. Todos los sujetos encuestados firmaron el consentimiento informado. Resultados: se encuestaron 224 pacientes, siendo 48% del sexo masculino y 52% del femenino. La edad media fue 44±17 años. La frecuencia de insatisfacción con la atención recibida fue 59%. La dimensión del cuestionario SERVQUAL con peor puntuación fue la tangibilidad. Los factores de riesgo asociados estadísticamente a la insatisfacción fueron el sexo masculino, la procedencia rural, el estado civil soltero y la presencia de comorbilidades. Conclusiones: la frecuencia de insatisfacción fue 59%. El perfil del paciente insatisfecho es un varón, de procedencia rural, soltero y con comorbilidades.

Introduction: the factors that influence patient dissatisfaction are diverse and vary with each country and type of hospital. Objectives: to find the frequency and factors associated with dissatisfaction in the care referred by the patients. Materials and methods: a quantitative investigation was carried out with the SERVQUAL questionnaire applied to the discharge of adult patients from the Medical Clinic Service of the National Hospital during the years 2018 and 2019. With the questionnaire we collected demographic, clinical variables and responses to 22 questions that evaluated five dimensions related to satisfaction with the service. All the subjects surveyed signed the informed consent. Results: 224 patients were surveyed, 48% being male and 52% female. The average age was 44 ± 17 years. The frequency of dissatisfaction with the care received was 59%. The dimension of the SERVQUAL questionnaire with the worst score was tangibility. The risk factors statistically associated with dissatisfaction were male sex, rural origin, single marital status and the presence of comorbidities. Conclusions: the frequency of dissatisfaction was 59%. The profile of the dissatisfied patient is a male, of rural origin, single and with comorbidities.

Tres casos consecutivos de gangrena seca en invierno / Three consecutive cases of dry gangrene in winter

Se presentan tres casos de gangrena seca ocurridos en el invierno austral del 2018. El primero corresponde a un varón de 37 años, portador de vasculitis por crioglobulinemia y enfermedad celiaca silente, que desarrolla gangrena seca en manos y pies. El segundo es una mujer de 40 años que consulta por gangrena seca de manos y pies, sin etiología demostrable. El tercero es un varón de 38 años que ingresa por choque séptico de origen neumónico que requiere tratamiento con vasopresores desarrollando gangrena seca de manos y pies. A pesar que los tres casos tienen etiología diferente, coincidieron con temperaturas muy frías (media 6° C), inusuales para el clima tropical del Paraguay.

We present three cases of dry gangrene occurred in the southern winter of 2018. The first corresponds to a 37-year-old man, carrier of vasculitis due to cryoglobulinemia and silent celiac disease, which develops dry gangrene in hands and feet. The second is a 40-year-old woman who consults for dry gangrene of hands and feet, without demonstrable etiology. The third is a 38-year-old male admitted for septic shock of pulmonary origin that requires treatment with vasopressors developing dry gangrene of the hands and feet. Although the three cases have a different etiology, they coincided with very cold temperatures (average 6 °C), unusual for the tropical climate of Paraguay.

Ripening Indices, Olive Yield and Oil Quality in Response to Irrigation With Saline Reclaimed Water and Deficit Strategies.

The 70% worldwide surface of olive orchards is irrigated. The evaluation of non-conventional water resources and water-saving techniques has gained importance during the last decades in arid and semiarid environments. This study evaluated the effects of irrigation with two water sources: low-cost water DEsalination and SEnsoR Technology (DESERT) desalinated water (DW) ECw ∼1 dS m-1) and reclaimed water (RW) (ECw ∼ 3 dS m-1) combined with two irrigation strategies: full irrigation (FI) (100% of ETc) and regulated deficit irrigation (RDI, 50% of ETc) on fruit yield, ripening indices, and oil yield and quality of olive trees cv Arbosana planted in Mediterranean conditions. Our results showed that RW without water restrictions increased the fruit yield by 35% due to a slight increase in the fruit weight and, mainly, to a greater fruit set than the control trees; although this did not result in a higher oil yield (g tree-1) since the oil content per fruit dry weight was reduced. The RDI strategy did not decrease the fruit yield despite the fact that olive weight tended to decrease, and it increased the oil yield by ∼14.5%. The combination of both stresses (RW and RDI) neither decreased the fruit yield; however, it significantly reduced oil yield (25% less in 2018) since oil content per fruit dry weight was strongly reduced (40%) compared to control trees. Both RDI treatments, regardless water source, determined acidity levels in olive paste lower than in FI treatments; however, it reduced oil extractability and fatty yield. The finding about oil quality indicated that olive exposure to RW, regardless of the water amount, decreased oil quality mainly due to the reduction of oleic acid and the increase of C18:2/C18:3 ratio and peroxides; on the contrary, both RW and RDI improved the total polyphenols. In all cases, the parameters met the legislation. In short, with appropriate management, RW and RDI have great potential to manage oil olive production; nevertheless, studies subjected to long-term use of these techniques should be experienced to ensure the sustainability of oil yields and quality.

Poor plant performance under simulated climate change is linked to mycorrhizal responses in a semiarid shrubland.

Warmer and drier conditions associated with ongoing climate change will increase abiotic stress for plants and mycorrhizal fungi in drylands worldwide, thereby potentially reducing vegetation cover and productivity and increasing the risk of land degradation and desertification. Rhizosphere microbial interactions and feedbacks are critical processes that could either mitigate or aggravate the vulnerability of dryland vegetation to forecasted climate change.We conducted a four-year manipulative study in a semiarid shrubland in the Iberian Peninsula to assess the effects of warming (~2.5ºC; W), rainfall reduction (~30%; RR) and their combination (W+RR) on the performance of native shrubs (Helianthemum squamatum) and their associated mycorrhizal fungi.Warming (W and W+RR) decreased the net photosynthetic rates of H. squamatum shrubs by ~31% despite concurrent increases in stomatal conductance (~33%), leading to sharp decreases (~50%) in water use efficiency. Warming also advanced growth phenology, decreased leaf nitrogen and phosphorus contents per unit area, reduced shoot biomass production by ~36% and decreased survival during a dry year in both W and W+RR plants. Plants under RR showed more moderate decreases (~10-20%) in photosynthesis, stomatal conductance and shoot growth.Warming, RR and W+RR altered ectomycorrhizal fungal (EMF) community structure and drastically reduced the relative abundance of EMF sequences obtained by high-throughput sequencing, a response associated with decreases in the leaf nitrogen, phosphorus and dry matter contents of their host plants. In contrast to EMF, the community structure and relative sequence abundances of other non-mycorrhizal fungal guilds were not significantly affected by the climate manipulation treatments.Synthesis: Our findings highlight the vulnerability of both native plants and their symbiotic mycorrhizal fungi to climate warming and drying in semiarid shrublands, and point to the importance of a deeper understanding of plant-soil feedbacks to predict dryland vegetation responses to forecasted aridification. The interdependent responses of plants and ectomycorrhizal fungi to warming and rainfall reduction may lead to a detrimental feedback loop on vegetation productivity and nutrient pool size, which could amplify the adverse impacts of forecasted climate change on ecosystem functioning in EMF-dominated drylands.

Agricultural reuse of municipal wastewater through an integral water reclamation management.

The DESERT-prototype, a state-of-the-art compact combination of water treatment technologies based on filtration and solar-based renewable energy, was employed to reclaim water for agricultural irrigation. Water reclaimed through the DESERT-prototype (PW) from a secondary effluent of a wastewater treatment plant, as well as conventional irrigation water (CW) and the secondary effluent (SW) itself, were employed to cultivate baby romaine lettuces in a greenhouse in Murcia (Spain), by means of drip and sprinkler irrigation methods, thus establishing six treatments. Assessments of physicochemical and microbiological quality of irrigation water, as well as agronomic and microbiological quality of crops from all treatments, showed that results associated to PW complied in all cases with relevant standards and guidelines. In contrast, results linked to SW and CW presented certain non-compliance cases of water and crop microbiological quality. These assessments lead to conclude that the DESERT-prototype is an appropriate technology for safe water reclamation oriented to agricultural production, that can be complemented by a proper irrigation method in reaching safety targets.

Enfermedad arterial periférica determinada por índice tobillo-brazo en pacientes con síndrome metabólico

RESUMEN Introducción: el síndrome metabólico se asocia con un mayor riesgo cardiovascular, incluyendo la enfermedad arterial periférica. Objetivos: determinar la frecuencia de la enfermedad arterial periférica detectada por el método índice tobillo brazo en pacientes con síndrome metabólico, describir las características clínicas y laboratoriales del síndrome metabólico y detallar la sintomatología de los pacientes con EAP según la escala de Fontaine Metodología: estudio observacional prospectivo realizado en 100 pacientes adultos que cumplían con criterios para síndrome metabólico, según los criterios armonizados del año 2009 internados en el Servicio de Clínica Médica del Hospital Nacional (Itauguá, Paraguay) en años 2016 y 2017. El índice tobillo-brazo derecho se calculó por el cociente de la presión arterial sistólica del tobillo derecho dividido la presión arterial sistólica más elevada de cualquier brazo y de forma similar para el índice tobillo-brazo izquierdo. Se consideró índice tobillo-brazo compatible con enfermedad arterial periférica todo valor ≤ 0,9. Resultados: se hallo 23% de insuficiencia vascular periférica, siendo 18% del lado derecho, 13% del lado izquierdo y 8% bilateral. Los criterios para síndrome metabólico fueron: hipertensión arterial (100%), circunferencia abdominal aumentada (89%), glicemia en ayunas elevada o diabetes mellitus tipo 2 (50%), colesterol HDL bajo (47%), triglicéridos elevados (35%). Solo 7/23 (30%) sujetos presentaron síntomas según la escala de Fontaine, 5 pacientes en estadio IIa y 2 en estadio IIb. Conclusión: la frecuencia de enfermedad arterial periférica fue 23%. La claudicación de miembros estaba presente en 30% de los afectados.

ABSTRACT Introduction: The metabolic syndrome is associated with an increased cardiovascular risk, including peripheral arterial disease. Objectives: To determine the frequency of peripheral arterial disease (PAD) detected by the ankle-brachial index method in patients with metabolic syndrome, to describe the clinical and laboratory characteristics of the metabolic syndrome and to detail the symptomatology of patients with PAD according to Fontaine scale. Methodology: A prospective observational study performed on 100 adult patients who met criteria for metabolic syndrome, according to the harmonized criteria of 2009, and admitted in the Medical Clinic Service of the Hospital Nacional (Itauguá, Paraguay) in 2016 and 2017. The right ankle-brachial index was calculated by the ratio of the systolic blood pressure of the right ankle divided by the higher systolic blood pressure of any arm and similarly for the left ankle-brachial index. The ankle-brachial index compatible with peripheral arterial disease was considered to be any value ≤0.9. Results: Twenty three percent of peripheral vascular insufficiency was found, being 18% of the right side, 13% of the left side and 8% bilateral. The criteria for metabolic syndrome were: arterial hypertension (100%), increased abdominal circumference (89%), high fasting blood sugar or type 2 diabetes mellitus (50%), low HDL cholesterol (47%), high triglycerides (35%). Only 7/23 (30%) subjects presented symptoms according to the Fontaine scale, 5 patients in stage IIa and 2 in stage IIb. Conclusion: The frequency of peripheral arterial disease was 23%. Claudication of limbs was present in 30% of those affected.

Ecological and functional adaptations to water management in a semiarid agroecosystem: a soil metaproteomics approach.

Climate change models point to a decrease in water availability in semiarid areas that would compromise the maintenance of sustainable agriculture. Here, we used a grapefruit agroecosystem model to evaluate the responses of the active soil microbial community - as a microbial subset directly involved in soil functionality- undergoing strategies to cope with the low water availability in south-east Spain. For this purpose, we tested the impacts of: (i) water quality: transfer-water from a river (TW) or reclaimed-water from a wastewater-treatment plant (RW); and (ii) water quantity: continuous optimal amount of water or reduced irrigation (RDI) in the temporal frame when the crop is less sensitive; and their interactions. Metaproteomics revealed that the phylogenetic diversity of the active community and its functional diversity were lowered in soils with RW. RDI lowered soil respiration and functional diversity while the phylogenetic diversity remained constant. The reestablishment of full irrigation after RDI led to a recovery of soil respiration that was accompanied by an enhanced abundance of resilient bacterial populations. Bacterial populations displayed molecular mechanisms against water stress that have been conserved evolutionarily in plants. Protein-based studies shed light on ecological and functional mechanisms that govern the adaptive responses of soil microbial communities to climate-change friendly water management.

Transformation of plum plants with a cytosolic ascorbate peroxidase transgene leads to enhanced water stress tolerance.

BACKGROUND AND AIMS: Water deficit is the most serious environmental factor limiting agricultural production. In this work, the tolerance to water stress (WS) of transgenic plum lines harbouring transgenes encoding cytosolic antioxidant enzymes was studied, with the aim of achieving the durable resistance of commercial plum trees. METHODS: The acclimatization process was successful for two transgenic lines: line C3-1, co-expressing superoxide dismutase (two copies) and ascorbate peroxidase (one copy) transgenes simultaneously; and line J8-1, harbouring four copies of the cytosolic ascorbate peroxidase gene (cytapx). Plant water relations, chlorophyll fluorescence and the levels of antioxidant enzymes were analysed in both lines submitted to moderate (7 d) and severe (15 d) WS conditions. Additionally, in line J8-1, showing the best response in terms of stress tolerance, a proteomic analysis and determination of the relative gene expression of two stress-responsive genes were carried out. KEY RESULTS: Line J8-1 exhibited an enhanced stress tolerance that correlated with better photosynthetic performance and a tighter control of water-use efficiency. Furthermore, this WS tolerance also correlated with a higher enzymatic antioxidant capacity than wild-type (WT) and line C3-1 plum plants. On the other hand, line C3-1 displayed an intermediate phenotype between WT plants and line J8-1 in terms of WS tolerance. Under severe WS, the tolerance displayed by J8-1 plants could be due to an enhanced capacity to cope with drought-induced oxidative stress. Moreover, proteomic analysis revealed differences between WT and J8-1 plants, mainly in terms of the abundance of proteins related to carbohydrate metabolism, photosynthesis, antioxidant defences and protein fate. CONCLUSIONS: The transformation of plum plants with cytapx has a profound effect at the physiological, biochemical, proteomic and genetic levels, enhancing WS tolerance. Although further experiments under field conditions will be required, it is proposed that J8-1 plants would be an interesting Prunus rootstock for coping with climate change.