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1.
Mycologia ; 116(5): 792-820, 2024.
Artículo en Inglés | MEDLINE | ID: mdl-39121366

RESUMEN

Pseudohydnum, commonly known as cat's tongue mushrooms, is a monophyletic assemblage within Auriculariales, which encompasses species with gelatinous basidiomata, spathulate, flabellate, or shell-shaped pileus, hydnoid hymenophore, globose to ellipsoidal basidiospores, and longitudinally cruciate-septate basidia. According to the available literature, 16 species have been described in Pseudohydnum, mostly represented in temperate-boreal forests of the Northern Hemisphere. However, the limited morphological, molecular, and ecological information, especially from the Southern Hemisphere ecosystems, does not presently allow a reliable assessment of its taxonomic boundaries nor provide a complete picture of the species diversity in the genus. In an ongoing effort to examine specimens collected in dense and mixed ombrophilous forest fragments (Atlantic Rainforest domain) from Southeastern and Southern Brazil, additional taxa assigned to Pseudohydnum were identified. Four new species are recognized based mostly on characters of the pileus surface, stipe, hymenium, and basidiospores. Molecular phylogenetic analyses based on nuc rDNA internal transcribed spacer region ITS1-5.8S-ITS2 (ITS barcode), partial nuc rDNA 28S, and partial RNA polymerase II largest subunit (RPB1) sequences supported the description of these new taxa. Here, we propose Pseudohydnum brasiliense, P. brunneovelutinum, P. cupulisnymphae, and P. viridimontanum as new species. Morphological descriptions, line drawings, habitat photos, and comparisons with closely related taxa are provided. A dichotomous key for identification of currently known Southern Hemisphere Pseudohydnum species is presented.


Asunto(s)
Agaricales , ADN de Hongos , ADN Espaciador Ribosómico , Filogenia , Esporas Fúngicas , ADN de Hongos/genética , Brasil , ADN Espaciador Ribosómico/genética , Esporas Fúngicas/citología , Esporas Fúngicas/clasificación , Agaricales/clasificación , Agaricales/genética , Agaricales/aislamiento & purificación , Agaricales/citología , Análisis de Secuencia de ADN , ADN Ribosómico/genética , Basidiomycota/clasificación , Basidiomycota/genética , Basidiomycota/citología , Basidiomycota/aislamiento & purificación , ARN Ribosómico 28S/genética , Cuerpos Fructíferos de los Hongos/citología , Bosques
2.
Artículo en Inglés | MEDLINE | ID: mdl-39190453

RESUMEN

Two Gram-stain-negative, aerobic, rod-shaped, orange-coloured bacterial strains, designated strain C216T and strain M2295, were isolated from mature mushroom compost from composting facilities in Victoria and South Australia, Australia, respectively. External structures such as flagella or pili were not observed on the cells under scanning electron microscopy. Optimal growth was found to occur at 45 °C, at pH 7.25 and in the absence of NaCl on Emerson's 350 YpSs medium. The genome sequence of strain C216T was 3 342 126 bp long with a G+C content of 40.5 mol%. Functional analysis of the genome of strain C216T revealed genes encoding chitinolytic and hemi-cellulolytic functions, with 166 predicted genes associated with carbohydrate metabolism (8.9% of the predicted genes). These functions are important for survival in the mushroom compost environment, which is rich in hemicelluloses. No antibiotic resistance genes were found in the genome sequence. The major fatty acids of strain C216T were iso-C15 : 0 (56.7%), iso-C17 : 0 3-OH (15.6%), C16 : 1 ω7c/iso-C15 : 0 2-OH (7.3%) and iso-C15 : 1 G (6.1%). The only respiratory quinone was MK-7. The major polar lipid of strain C216T was phosphatidylethanolamine, but three unidentified phospholipids, four unidentified aminophospholipids/aminolipids and one unidentified glycolipid were also detected. Phylogenetic analysis based on proteins encoded by the core genome (bac120, 120 conserved bacterial genes) showed that strain C216T forms a distinct lineage in the family Chitinophagaceae and that the closest identified relative is Niabella soli (69.69% ANI). These data demonstrate that strain C216T represents a novel genus and novel species within the family Chitinophagaceae, for which we propose the name Mycovorax composti. The type strain is C216T (=DSM 114558T=LMG 32998T).


Asunto(s)
Agaricales , Técnicas de Tipificación Bacteriana , Composición de Base , Compostaje , ADN Bacteriano , Ácidos Grasos , Filogenia , ARN Ribosómico 16S , Análisis de Secuencia de ADN , Microbiología del Suelo , Ácidos Grasos/análisis , Agaricales/genética , Agaricales/clasificación , Agaricales/aislamiento & purificación , ADN Bacteriano/genética , ARN Ribosómico 16S/genética , Comamonadaceae/genética , Comamonadaceae/aislamiento & purificación , Comamonadaceae/clasificación , Fosfolípidos/análisis , Vitamina K 2/análogos & derivados , Fosfatidiletanolaminas , Genoma Bacteriano , Australia del Sur
3.
Mycologia ; 116(5): 848-864, 2024.
Artículo en Inglés | MEDLINE | ID: mdl-38990778

RESUMEN

Species of the ectomycorrhizal (ECM) family Cortinariaceae (Agaricales, Agaricomycetes, Basidiomycota) have long been considered impoverished or absent from lowland tropical rainforests. Several decades of collecting in forests dominated by ECM trees in South America's Guiana Shield is countering this view, with discovery of numerous Cortinariaceae species. To date, ~12 morphospecies of this family have been found in the central Pakaraima Mountains of Guyana. Here, we describe three of these as new species of Cortinarius and two as new species of Phlegmacium from forests dominated by the ECM tree genera Dicymbe (Fabaceae subfam. Detarioideae), Aldina (Fabaceae subfam. Papilionoideae), and Pakaraimaea (Cistaceae). Macromorphological, micromorphological, habitat, and DNA sequence data are provided for each new species.


Asunto(s)
Agaricales , ADN de Hongos , Fabaceae , Micorrizas , Filogenia , Guyana , ADN de Hongos/genética , Micorrizas/clasificación , Micorrizas/genética , Agaricales/clasificación , Agaricales/genética , Agaricales/aislamiento & purificación , Fabaceae/microbiología , Análisis de Secuencia de ADN , ADN Espaciador Ribosómico/genética , Cortinarius/clasificación , Cortinarius/genética , Cortinarius/aislamiento & purificación , Ecosistema , ADN Ribosómico/genética , Esporas Fúngicas/citología , Esporas Fúngicas/clasificación
4.
Mycologia ; 116(5): 821-834, 2024.
Artículo en Inglés | MEDLINE | ID: mdl-38953774

RESUMEN

Two new Psilocybe species (Hymenogastraceae), P. ingeli and P. maluti, are described from southern Africa. Morphology and phylogeny were used to separate the two novel fungi from their closest relatives in the genus. Psilocybe ingeli was found fruiting on bovine manure-enriched grasslands in the Kwa-Zulu Natal Province of South Africa and differs from its closest relative P. keralensis and others in the internal transcribed spacer ITS1-5.8S-ITS2, partial 28S nuc rDNA, and translation elongation factor 1-alpha regions, distribution, and having larger basidiospores. Similarly, P. maluti was collected from the Free State Province of South Africa and observed in the Kingdom of Lesotho, growing on bovine manure. A secotioid pileus, geographic distribution, and differences in the same DNA regions distinguish P. maluti from its closest relative P. chuxiongensis. Furthermore, the spore dispersal and traditional, spiritualistic use of P. maluti are discussed here.


Asunto(s)
ADN de Hongos , ADN Espaciador Ribosómico , Filogenia , Psilocybe , ADN de Hongos/genética , ADN Espaciador Ribosómico/genética , Animales , Sudáfrica , Psilocybe/genética , Bovinos , Análisis de Secuencia de ADN , ADN Ribosómico/genética , Esporas Fúngicas , África Austral , Estiércol/microbiología , ARN Ribosómico 28S/genética , Factor 1 de Elongación Peptídica/genética , Cuerpos Fructíferos de los Hongos , ARN Ribosómico 5.8S/genética , Agaricales/clasificación , Agaricales/genética , Agaricales/aislamiento & purificación
5.
Fungal Biol ; 128(3): 1758-1770, 2024 May.
Artículo en Inglés | MEDLINE | ID: mdl-38796260

RESUMEN

Starting in the fall of 2019, mortality, blight symptoms, and signs of white fungal mycelia were observed on external host tissues of non-native landscape trees as well as numerous native trees, understory shrubs, and vines throughout northern and central Florida, USA. We determined that the fungus is an undescribed species of Basidiomycota based on morphological characteristics and DNA sequence analysis. Phylogenetic analyses of the internal transcribed spacer (ITS), large subunit (LSU), and translation elongation factor 1-alpha (tef1) regions revealed that this novel plant pathogen is an undescribed taxon of the genus Parvodontia (Cystostereaceae, Agaricales). We propose the name Parvodontia relampaga sp. nov. which describes its unique morphological features and phylogenetic placement. We confirmed the pathogenicity of P. relampaga in greenhouse inoculations on host plants from which strains of this novel pathogen were isolated, including the non-native gymnosperm Afrocarpus falcatus, the non-native and commercially important Ligustrum japonicum, and the native tree Quercus hemisphaerica. P. relampaga was also detected on a total of 27 different species of woody host plants, including such economically and ecologically important hosts as Fraxinus, Ilex, Magnolia, Persea, Prunus, Salix, Vitis, and Vaccinium. For this new plant disease, we propose the name "relampago blight," which refers to the lightning-like rhizomorph growth (relámpago means 'lightning' in Spanish). This study presents a newly discovered fungal taxon with a wide host range on both angiosperms and gymnosperms that may be an emerging pathogen of concern in Florida and the Gulf Coast region.


Asunto(s)
ADN de Hongos , Filogenia , Enfermedades de las Plantas , Enfermedades de las Plantas/microbiología , Florida , ADN de Hongos/genética , Agaricales/genética , Agaricales/clasificación , Agaricales/aislamiento & purificación , Agaricales/fisiología , Agaricales/patogenicidad , Análisis de Secuencia de ADN , ADN Espaciador Ribosómico/genética , ADN Espaciador Ribosómico/química
6.
Mycologia ; 116(3): 392-408, 2024.
Artículo en Inglés | MEDLINE | ID: mdl-38551379

RESUMEN

The porcini mushroom family Boletaceae is a diverse, widespread group of ectomycorrhizal (ECM) mushroom-forming fungi that so far has eluded intrafamilial phylogenetic resolution based on morphology and multilocus data sets. In this study, we present a genome-wide molecular data set of 1764 single-copy gene families from a global sampling of 418 Boletaceae specimens. The resulting phylogenetic analysis has strong statistical support for most branches of the tree, including the first statistically robust backbone. The enigmatic Phylloboletellus chloephorus from non-ECM Argentinian subtropical forests was recovered as a new subfamily sister to the core Boletaceae. Time-calibrated branch lengths estimate that the family first arose in the early to mid-Cretaceous and underwent a rapid radiation in the Eocene, possibly when the ECM nutritional mode arose with the emergence and diversification of ECM angiosperms. Biogeographic reconstructions reveal a complex history of vicariance and episodic long-distance dispersal correlated with historical geologic events, including Gondwanan origins and inferred vicariance associated with its disarticulation. Together, this study represents the most comprehensively sampled, data-rich molecular phylogeny of the Boletaceae to date, establishing a foundation for future robust inferences of biogeography in the group.


Asunto(s)
Agaricales , Genoma Fúngico , Filogenia , Agaricales/genética , Agaricales/clasificación , Agaricales/aislamiento & purificación , Secuenciación Completa del Genoma , Micorrizas/genética , Micorrizas/clasificación , Filogeografía
8.
J Microbiol Methods ; 191: 106348, 2021 12.
Artículo en Inglés | MEDLINE | ID: mdl-34699864

RESUMEN

Neonothopanus gardneri, also known as coconut flower mushroom (flor-de-coco), is a Brazilian bioluminescent basidiomycete found in Palm Forest, a transitional biome between the Amazonian Forest and Caatinga (Savanna-like vegetation) in Northeast Brazil, especially in Piauí State. Recent advances toward the elucidation of fungal bioluminescence have contributed to the discovery of four genes (hisps, h3h, luz and cph) involved with the bioluminescence process, the so-called Caffeic Acid Cycle (CAC) and to develop biotechnological applications such autoluminescent tobacco plants and luciferase-based reporter genes. High-yield and -quality RNA-extraction methods are required for most of these purposes. Herein, four methods for RNA isolation from the mycelium of N. gardneri were evaluated: RNeasy® kit (QIAGEN), TRI+, TRI18G+, and TRI26G+. Highest RNA yield was observed for TRI18G+ and TRI26G+ methods, an increase of ~130% in comparison to the RNeasy® method and of ~40% to the TRI+ protocol. All the RNA samples showed good purity and integrity, except by gDNA contamination in RNA samples produced with the RNeasy® method. High quality of RNA samples was confirmed by successful cDNA synthesis and PCR amplification of the coding sequence of h3h gene, responsible for the hydroxylation of the precursor of fungal luciferin (3-hydroxyhispidin). Similarly, RT-qPCR amplification of ef-tu gene, related to the protein biosynthesis in the cell, was demonstrated from RNA samples. This is the first report of a reproducible, time-saving and low-cost optimized method for isolation of high-quality and -yield, DNA-free RNA from a bioluminescent fungus, but that can also be useful for other basidiomycetes.


Asunto(s)
Agaricales/genética , Mediciones Luminiscentes/métodos , Micelio/genética , Técnicas de Tipificación Micológica/métodos , ARN de Hongos/aislamiento & purificación , Agaricales/aislamiento & purificación , Agaricales/metabolismo , Biotecnología , Brasil , ADN Complementario , Ecosistema , Bosques , Luciferinas , Tipificación Molecular/métodos , Reacción en Cadena de la Polimerasa , Biosíntesis de Proteínas
9.
Biotechnol Lett ; 43(4): 845-854, 2021 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-33389270

RESUMEN

The aim of this study was to characterize the growth of the fungus Leucoagaricus gongylophorus LEU18496, isolated from the fungus garden of the nest of leaf cutter ants Atta mexicana. The fungus garden was cultivated in an artificial laboratory nest and the fungus further grown in submerged (SmC) and solid state (SSC) cultures with sugarcane bagasse, grass or model substrates containing CM-cellulose, xylan or lignin. The CO2 production rate with grass in SmC (Vmax 34.76 mg CO2 Lgas-1 day- 1) was almost four times than SSC (Vmax 9.49 mg CO2 Lgas-1 day- 1), while the production rate obtained in sugarcane bagasse in SmC (Vmax 16.02 mg CO2 Lgas-1 day- 1) was almost three times than that for SSC (Vmax 5.42 mg CO2 Lgas-1 day- 1). In addition, the fungus grew with defined carbon substrates mixtures in SmC, but at different rates, first xylan, followed by CM-cellulose and lignin. Endoglucanase and xylanase activities (U mgprotein-1) were detected in all cultures, the specific activity was higher in the fungus-garden, 5.2 and 1.8; followed by SSC-grass, 1.5 and 0.8, and SSC-bagasse, 0.9 and 0.8, respectively. Laccase activity in the fungus-garden was 44.8 U L- 1 and 10.9 U L- 1 in the SSC-grass. The gongylidia structures observed by environmental scanning electron microscopy were ca. 40 µm and the hyphae width ca. 5 µm. The results show that L. gongylophorus from A. mexicana have promising applications for the treatment of plant residues to release fermentable sugars and the production of high value lignocellulolytic enzymes such as endoglucanase, xylanase or laccases.


Asunto(s)
Agaricales/crecimiento & desarrollo , Hormigas/microbiología , Celulasa/metabolismo , Endo-1,4-beta Xilanasas/metabolismo , Lignina/metabolismo , Agaricales/enzimología , Agaricales/aislamiento & purificación , Animales , Celulosa/química , Cromatografía de Gases , Fermentación , Proteínas Fúngicas/metabolismo , Regulación Enzimológica de la Expresión Génica , Regulación Fúngica de la Expresión Génica , Microscopía Electrónica de Rastreo , Hojas de la Planta/parasitología
10.
Mycologia ; 113(1): 168-190, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-33175671

RESUMEN

Four epitypes and three new species of Amanita (Amanitaceae, Agaricales, Agaricomycetes, Basidiomycota) are described from Guineo-Congolian rainforests of Cameroon. Amanita echinulata, A. fulvopulverulenta, A. robusta, and A. bingensis are epitypified based on collections that are the first since the species were described nearly a century ago. Morphological features of the epitypes are described and enumerated. Amanita minima, Amanita luteolamellata, and A. goossensfontanae are described as new and added to the known macromycota of tropical Africa. Habit, habitat, and known distribution are provided for each species. Sequence data for the internal transcribed spacer (ITS) locus are provided for types and other collections of all taxa, and a molecular phylogenetic analysis across the genus Amanita corroborates morphology-based infrageneric placement for each.


Asunto(s)
Amanita , Clasificación , Agaricales/clasificación , Agaricales/genética , Agaricales/aislamiento & purificación , Amanita/clasificación , Amanita/genética , Amanita/aislamiento & purificación , Camerún , ADN Espaciador Ribosómico/genética , Ecosistema , Genes Fúngicos , Filogenia , Bosque Lluvioso
11.
Mycologia ; 113(1): 33-42, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-33337985

RESUMEN

Phlebopus roseus is described as new based on collections from southwest China. Phylogenetic analyses of nuclear rDNA internal transcribed spacer region ITS1-5.8S-ITS2 (ITS) and portions of nuclear 28S rDNA (28S), translation elongation factor 1-alpha (tef1), and the largest and second largest subunits of RNA polymerase II (rpb1, rpb2) support P. roseus as a novel species in the genus Phlebopus (Boletinellaceae, Boletales). The new species resembles P. portentosus but differs from it in that mature basidiomata have a bright rose-red-colored stipe and a radiate tubular hymenophore with nested pores. Despite extensive searching, P. roseus has only been found at four sites within a 24-hectare orchard dominated by Eriobotrya japonica, which is agriculturally important given its fruit production (loquats). Therefore, this species appears to be endemic and geographically restricted. The ecology of this bolete is also unique. In line with the trophic behavior of other species in the Boletinellaceae, our observations indicate that P. roseus forms a symbiotic association with the scale insect Coccus hesperidum, identified through sequence analysis of its mitochondrial cytochrome c oxidase subunit I (COI) region, to form fungus-insect galls that develop on roots of E. japonica trees. Phlebopus roseus is an edible mushroom species and is collected from the type location by farmers and sold commercially in limited quantities at local markets alongside P. portentosus and other fungi.


Asunto(s)
Basidiomycota , Agaricales/clasificación , Agaricales/genética , Agaricales/aislamiento & purificación , Animales , Basidiomycota/clasificación , Basidiomycota/genética , Basidiomycota/aislamiento & purificación , China , Clasificación , ADN de Hongos/genética , Eriobotrya/microbiología , Hemípteros , Factor 1 de Elongación Peptídica/genética , Raíces de Plantas/microbiología , Tumores de Planta/microbiología , ARN Polimerasa II/genética , ARN Ribosómico 28S/genética , Simbiosis
12.
BMJ Case Rep ; 13(12)2020 Dec 28.
Artículo en Inglés | MEDLINE | ID: mdl-33372014

RESUMEN

A 44-year-old Asian Indian woman presented with a history of pain and redness in the left eye for 3 weeks. Scleral congestion with a nodular swelling was present inferotemporally. Raised C reactive protein and positive antinuclear and perinuclear antineutrophil cytoplasmic antibodies suggested autoimmune scleritis. The patient was therefore managed with corticosteroids. Nevertheless, the development of severe pain associated with a scleral abscess led to a revised diagnosis of infectious scleritis. Corticosteroids therapy was halted and urgent debridement was performed. Microbiology confirmed fungal scleritis due to Coprinopsis cinerea Multiple full-thickness circumferential debridements with antifungal therapy resulted in satisfactory anatomical and visual outcomes. This case presented a unique challenge, since laboratory results were misleading, and corticosteroids resulted in a fulminant clinical course. Therefore, aggressive circumferential debridement was performed to achieve the elimination of a rare fungal aetiology of scleritis, which has not been reported previously to cause human infection.


Asunto(s)
Agaricales/aislamiento & purificación , Infecciones Fúngicas del Ojo/microbiología , Infecciones Fúngicas del Ojo/cirugía , Escleritis/microbiología , Escleritis/cirugía , Corticoesteroides/efectos adversos , Corticoesteroides/uso terapéutico , Adulto , Antifúngicos/uso terapéutico , Diagnóstico Diferencial , Progresión de la Enfermedad , Infecciones Fúngicas del Ojo/tratamiento farmacológico , Dolor Ocular/microbiología , Femenino , Humanos , Escleritis/tratamiento farmacológico , Sulfonamidas/uso terapéutico , Tiofenos/uso terapéutico , Timolol/uso terapéutico
13.
BMC Infect Dis ; 20(1): 945, 2020 Dec 11.
Artículo en Inglés | MEDLINE | ID: mdl-33308180

RESUMEN

BACKGROUND: Filamentous basidiomycetes are mainly considered to be respiratory tract colonizers but the clinical significance of their isolation in a specimen is debatable. Hormographiella aspergillata was first reported as a human pathogen in 1971. We discuss the role of this mold as a pathogen or colonizer and give an update on diagnostic tools and in vitro antifungal susceptibility. CASE PRESENTATION: We identified three cases of H. aspergillata with respiratory symptoms in a short period of time. One invasive infection and two colonizations were diagnosed. Culture supernatants showed that H. aspergillata can produce galactomannan and ß-D-glucan but not glucuronoxylomannan. For the first time, isavuconazole susceptibility was determined and high minimum inhibitory concentrations (MICs) were found. Liposomal amphotericin B and voriconazole have the lowest MICs. CONCLUSION: To date, 22 invasive infections involving H. aspergillata have been reported. On isolation of H. aspergillata, its pathogenic potential in clinical settings can be tricky. Molecular identification and antifungal susceptibility testing are essential considering high resistance against several antifungal therapies.


Asunto(s)
Agaricales/genética , Anfotericina B/administración & dosificación , Antifúngicos/administración & dosificación , Enfermedades Pulmonares Fúngicas/diagnóstico , Adulto , Agaricales/aislamiento & purificación , Anciano , Resultado Fatal , Femenino , Humanos , Masculino , Pruebas de Sensibilidad Microbiana , Persona de Mediana Edad , Resultado del Tratamiento
14.
Mycologia ; 112(6): 1086-1103, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32897841

RESUMEN

In tropical and subtropical rainforests, vegetative fungal rhizomorphs from the Marasmiineae are routinely used as construction material in bird nests. Because rhizomorphs seldom produce mushrooms within nests, the fungal species involved remain largely unknown. In turn, this limitation has prevented us from resolving broader questions such as whether specific fungal species are selected by birds for different functional roles (i.e., attachment, or parasite control). To fill some of these gaps, we collected 74 rhizomorph-containing bird nests from the Neo- and Afrotropics and used nuc rDNA internal transcribed spacer ITS1-5.8S-ITS2 (ITS) sequences to discriminate between rhizomorph-forming species. In total we recovered 25 Marasmiineae species used by birds in nest construction, none of which were shared between the Neotropics and the Afrotropics. We also collected Marasmiineae basidiomes in the vicinity of nests and used ITS sequences to match these sporulating morphs with nest rhizomorphs for nine species. Basidiomes from an additional five species were found fruiting from rhizomorphs incorporated within bird nests. Finally, an additional six species were putatively identified based on publicly available sequence data. Rhizomorphs of five species were found to be utilized almost exclusively as lining material in nests. Lining material comes in direct contact with nestlings and is hypothesized to play a role in parasite control. Rhizomorphs from 10 species were used to attach and anchor nests to substrates; we matched six of those to fruiting litter trap-forming species collected in the understory. Litter traps hold large quantities of fallen litter material, suggesting that birds may preferentially use rhizomorphs that are adapted to bearing heavy loads for nest attachment. Finally, we describe two species of Marasmius-M. neocrinis-equi, sp. nov., and M. nidus-avis, sp. nov.-that are commonly found associated with bird nests and show that rhizomorph production is common across the genus.


Asunto(s)
Agaricales/clasificación , Agaricales/genética , Aves , Variación Genética , Clima Tropical , Agaricales/aislamiento & purificación , Animales , Comportamiento de Nidificación
15.
BMC Microbiol ; 20(1): 266, 2020 08 26.
Artículo en Inglés | MEDLINE | ID: mdl-32847512

RESUMEN

BACKGROUND: Atrazine is one of the most widespread chlorinated herbicides, leaving large bulks in soils and groundwater. The biodegradation of atrazine by bacteria is well described, but many aspects of the fungal metabolism of this compound remain unclear. Thus, we investigated the toxicity and degradation of atrazine by 13 rainforest basidiomycete strains. RESULTS: In liquid medium, Pluteus cubensis SXS320, Gloelophyllum striatum MCA7, and Agaricales MCA17 removed 30, 37, and 38%, respectively, of initial 25 mg L- 1 of the herbicide within 20 days. Deficiency of nitrogen drove atrazine degradation by Pluteus cubensis SXS320; this strain removed 30% of atrazine within 20 days in a culture medium with 2.5 mM of N, raising three metabolites; in a medium with 25 mM of N, only 21% of initial atrazine were removed after 40 days, and two metabolites appeared in culture extracts. This is the first report of such different outcomes linked to nitrogen availability during the biodegradation of atrazine by basidiomycetes. The herbicide also induced synthesis and secretion of extracellular laccases by Datronia caperata MCA5, Pycnoporus sanguineus MCA16, and Polyporus tenuiculus MCA11. Laccase levels produced by of P. tenuiculus MCA11 were 13.3-fold superior in the contaminated medium than in control; the possible role of this enzyme on atrazine biodegradation was evaluated, considering the strong induction and the removal of 13.9% of the herbicide in vivo. Although 88% of initial laccase activity remained after 6 h, no evidence of in vitro degradation was observed, even though ABTS was present as mediator. CONCLUSIONS: This study revealed a high potential for atrazine biodegradation among tropical basidiomycete strains. Further investigations, focusing on less explored ligninolytic enzymes and cell-bound mechanisms, could enlighten key aspects of the atrazine fungal metabolism and the role of the nitrogen in the process.


Asunto(s)
Agaricales/efectos de los fármacos , Agaricales/metabolismo , Atrazina/metabolismo , Lacasa/metabolismo , Agaricales/crecimiento & desarrollo , Agaricales/aislamiento & purificación , Atrazina/farmacología , Biodegradación Ambiental , Medios de Cultivo , Contaminantes Ambientales/metabolismo , Matriz Extracelular/enzimología , Proteínas Fúngicas/metabolismo , Nitrógeno/metabolismo , Polyporaceae/efectos de los fármacos , Polyporaceae/metabolismo , Bosque Lluvioso , Especificidad de la Especie
16.
Int J Med Mushrooms ; 22(5): 501-507, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32749104

RESUMEN

Panus lecomtei is emerging as an edible mushroom found worldwide and particularly in the Northern Hemisphere. The mushroom contains a substantial amount of useful nutritional and medicinal compounds. In the present study, we have examined a specimen of P. lecomtei submitted to the ICAR-Directorate of Mushroom Research gene bank. The specimen was examined for taxonomical characters using classical and molecular tools. Attempts were made for cultivation of this mushroom under controlled conditions using sawdust-based substrate. The specimen was characterized by its purplish fruiting body having coarse, rigid, dense hairs on the cap, pubescent stipe, and abundant metuloids. Molecular identification through conserved ITS region was done and the sequence was deposited in NCBI GenBank under accession number MN332200. Nutritional profiling and biochemical analysis showed that the mushroom contained high carbohydrate but low fat contents. The mushroom showed the presence of phenolics, ß-carotene, and lycopene. The analysis also showed substantial antioxidant properties in the mushroom. The findings presented herein point out that P. lecomtei can be used as a potential edible mushroom for diversification of mushroom production in India.


Asunto(s)
Polyporales , Agaricales/química , Agaricales/genética , Agaricales/aislamiento & purificación , Antioxidantes/química , Clasificación , ADN Espaciador Ribosómico/genética , Cuerpos Fructíferos de los Hongos/química , Cuerpos Fructíferos de los Hongos/crecimiento & desarrollo , Cuerpos Fructíferos de los Hongos/ultraestructura , Genes Fúngicos , India , Licopeno/análisis , Licopeno/aislamiento & purificación , Microscopía Electrónica de Rastreo , Fenoles/análisis , Fenoles/aislamiento & purificación , Filogenia , Polyporales/química , Polyporales/genética , Polyporales/crecimiento & desarrollo , Polyporales/aislamiento & purificación , beta Caroteno/análisis , beta Caroteno/aislamiento & purificación
17.
Emerg Microbes Infect ; 9(1): 1114-1122, 2020 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-32475225

RESUMEN

Filamentous basidiomycetes are uncommon agents of human diseases, despite their ubiquitous presence in the environment. We present a case of symptomatic pulmonary infection in a 38-year-old male with cough and fever; a thin-walled cyst in the posterior left upper pulmonary lobe was revealed by radiography. A non-sporulating fungus was isolated from sputum and biopsy material from the cyst. ITS and LSU sequences placed the fungus phylogenetically in Agaricales, family Cyphellaceae, and identified it as a member of shelf fungi in Gloeostereum, but without identity to any known species. The new species is described as Gloeostereum cimri. The clinical strain showed high MIC to voriconazole (>8 µg/ml) but had low MIC to amphotericin B (0.5 µg/ml).


Asunto(s)
Agaricales/genética , Agaricales/aislamiento & purificación , Quistes/microbiología , Infecciones del Sistema Respiratorio/microbiología , Esputo/microbiología , Adulto , Agaricales/efectos de los fármacos , Antifúngicos/farmacología , Antifúngicos/uso terapéutico , Biopsia , Quistes/patología , Humanos , Pulmón/microbiología , Pulmón/patología , Masculino , Pruebas de Sensibilidad Microbiana , Micosis/diagnóstico por imagen , Micosis/tratamiento farmacológico , Infecciones del Sistema Respiratorio/diagnóstico por imagen , Tórax/diagnóstico por imagen , Tomografía
18.
Mycologia ; 112(2): 371-399, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32119635

RESUMEN

Within the family Entolomataceae, many reports of Entoloma and Rhodocybe have been published, but few reports on Clitopilus and allied genera are available. In this study, Clitopilus, Clitocella, and Clitopilopsis from China were studied by morphological and phylogenetic methods. Portions of nuc 28S rDNA (28S), RNA polymerase II second largest subunit (rpb2), translation elongation factor 1-alpha (tef1), and ATPase subunit 6 (atp6), were employed to elucidate the relationships of Clitopilus and allies. Results indicate that Clitopilus should be divided into three sections, namely, sect. Clitopilus, sect. Scyphoides, and sect. Crispi, the last of which is newly described. In total, 17 species of Clitopilus, Clitocella, and Clitopilopsis are found in China; 14 species belong to Clitopilus, of which 5 are new: C. yunnanensis, C. brunniceps, C. rugosiceps, C. sinoapalus, and C. umbilicatus. Two species of Clitocella, including one new species, Clitocella orientalis, are described. One new species of Clitopilopsis, namely, Clitopilopsis albida, is proposed.


Asunto(s)
Agaricales/clasificación , Agaricales/citología , Agaricales/genética , Agaricales/aislamiento & purificación , China , Genes Fúngicos , Tipificación de Secuencias Multilocus , Filogenia
19.
Mycologia ; 112(2): 438-452, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32074023

RESUMEN

This study describes four gray or brown species of Cuphophyllus (Hygrophoraceae, Agaricales), two of them new species, restricted to arctic-alpine and northern boreal zones of North America, and relates them morphologically and phylogenetically using multigene and nuc rDNA internal transcribed spacer ITS1-5.8S-ITS (ITS barcode) analyses to their similar, known counterparts. Cuphophyllus cinerellus, epitypified here, is shown to be a pan-palearctic species with sequence-confirmed collections from Fennoscandia and easternmost Asia. Occupying a similar habitat in the Nearctic is its sister species, the morphologically similar but novel C. esteriae, so far known only from eastern North America, including Greenland. Sister to the C. cinerellus-C. esteriae lineage, and known only from boreal raised Sphagnum bogs in Newfoundland, is a new medium-sized light cinereous brown species, C. lamarum. It has a yellow stipe but is phylogenetically distant from the yellow-stiped European C. flavipes and its North American sister species, Hygrophorus pseudopallidus. As cryptic speciation was discovered within C. flavipes, we lecto- and epitypify the name and transfer H. pseudopallidus to Cuphophyllus based on ITS analysis of the holotype. We also transfer the small European Hygrocybe comosa to Cuphophyllus based on morphology. Cuphophyllus hygrocyboides is reported from North America with the first sequence-confirmed collections from arctic-alpine British Columbia and Greenland. In addition, sequencing the holotype of C. subviolaceus identifies it as the sister species to the putative C. lacmus. Both species seem to have an intercontinental distribution. In total, we add new sequences to GenBank from 37 Cuphophyllus collections, including the holotypes of C. hygrocyboides and C. subviolaceus, the two new epitypes, and the two novel species.


Asunto(s)
Agaricales/clasificación , Clasificación/métodos , Agaricales/citología , Agaricales/genética , Agaricales/aislamiento & purificación , Regiones Árticas , Cuerpos Fructíferos de los Hongos , Genes Fúngicos , Tipificación de Secuencias Multilocus , Micorrizas , América del Norte , Plantago/microbiología , Especificidad de la Especie , Esporas Fúngicas/citología
20.
Mycopathologia ; 185(2): 389-394, 2020 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-31915988

RESUMEN

A case of fungal keratitis due to Coprinellus radians is reported. To our knowledge, fungal keratitis caused by this species was rare. Fungal hyphae were detected in corneal scrapings, and isolates were identified by morphology and by sequencing the internal transcribed spacer region of ribosomal DNA. The patient was treated with systemic and local antifungal therapy for 5 days, and lamellar keratoplasty was performed after no obvious improvement in symptoms. The in vitro antifungal susceptibilities of the case strain were tested for six antifungal agents. The results showed that 5-fluorouracil was resistant, fluconazole was moderately sensitive, and the other drugs assayed (amphotericin B, posaconazole, itraconazole and voriconazole) were highly effective against this fungus.


Asunto(s)
Agaricales , Antifúngicos/uso terapéutico , Queratitis , Agaricales/citología , Agaricales/genética , Agaricales/aislamiento & purificación , Anfotericina B/uso terapéutico , Trasplante de Córnea , Úlcera de la Córnea/tratamiento farmacológico , Úlcera de la Córnea/cirugía , ADN de Hongos , ADN Espaciador Ribosómico , Infecciones Fúngicas del Ojo/patología , Femenino , Humanos , Hifa/aislamiento & purificación , Queratitis/tratamiento farmacológico , Queratitis/microbiología , Queratitis/patología , Pruebas de Sensibilidad Microbiana , Persona de Mediana Edad , Triazoles/uso terapéutico
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