Cryptococcus agrionensis sp. nov., a basidiomycetous yeast of the acidic rock drainage ecoclade, isolated from an acidic aquatic environment of volcanic origin

Russo, Gabriel; Libkind, Diego; Ulloa, Ricardo; García, Virginia de; Sampaio, José Paulo; Broock, María Rosa van

doi:10.1099/ijs.0.012534-0

Cited by 16 publications

(11 citation statements)

References 14 publications

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“…Notes : The gastricus clade recognised in Liu et al. (2015) consists of C. gastricus and C. gilvescens isolated from soil ( Fell et al., 2000 , Boekhout et al., 2011a , Fonseca et al., 2011 ); C. aciditolerans , C. ibericus and C. metallitolerans in the ARD ecoclade that were obtained from acid rock drainage ( Gadanho & Sampaio 2009 ); and C. agrionensis from acidic water of a volcanic environment ( Russo et al. 2010 ).…”

Section: Taxonomymentioning

confidence: 99%

Towards an integrated phylogenetic classification of theTremellomycetes

Liu¹,

Wang²,

Göker³

et al. 2015

Studies in Mycology

398

356

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Families and genera assigned to Tremellomycetes have been mainly circumscribed by morphology and for the yeasts also by biochemical and physiological characteristics. This phenotype-based classification is largely in conflict with molecular phylogenetic analyses. Here a phylogenetic classification framework for the Tremellomycetes is proposed based on the results of phylogenetic analyses from a seven-genes dataset covering the majority of tremellomycetous yeasts and closely related filamentous taxa. Circumscriptions of the taxonomic units at the order, family and genus levels recognised were quantitatively assessed using the phylogenetic rank boundary optimisation (PRBO) and modified general mixed Yule coalescent (GMYC) tests. In addition, a comprehensive phylogenetic analysis on an expanded LSU rRNA (D1/D2 domains) gene sequence dataset covering as many as available teleomorphic and filamentous taxa within Tremellomycetes was performed to investigate the relationships between yeasts and filamentous taxa and to examine the stability of undersampled clades. Based on the results inferred from molecular data and morphological and physiochemical features, we propose an updated classification for the Tremellomycetes. We accept five orders, 17 families and 54 genera, including seven new families and 18 new genera. In addition, seven families and 17 genera are emended and one new species name and 185 new combinations are proposed. We propose to use the term pro tempore or pro tem. in abbreviation to indicate the species names that are temporarily maintained.

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Section: Taxonomymentioning

confidence: 99%

Towards an integrated phylogenetic classification of theTremellomycetes

Liu¹,

Wang²,

Göker³

et al. 2015

Studies in Mycology

398

356

View full text Add to dashboard Cite

show abstract

“…When exposed to Cu 2þ , C. agrionensis colonies acquired brownish pigmentation, different from the pale pink color expected for this species [46]. This change of color was extremely suggestive, since similar changes were observed when Cu 2þ was included by metallothineins into cytoplasm in other yeasts species [47].…”

Section: Discussionmentioning

confidence: 65%

“…This latter species proved to be particularly interesting given its phylogenetic relationship to three Cryptococcus species isolated from an extreme acidic aquatic environment of Portugal [33,41,46]. This phylogenetic relationship indicates that all four species might have evolved to thrive in such acidic environment.…”

Section: Discussionmentioning

confidence: 89%

Heavy metal capture by autochthonous yeasts from a volcanic influenced environment of Patagonia

Russo

Libkind

Giraudo

et al. 2016

J. Basic Microbiol.

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Heavy metals at elevated concentrations are a major threat to agricultural and human health. Typically, human activities tend to release these metals to the environment in aqueous solutions, generating high levels of pollution due to the mobility of the heavy metals. The aim of the present work was to assess heavy metal tolerance in yeasts isolated from Río Agrio - Lake Caviahue volcanic acidic aquatic environment and to evaluate the capacity of selected strains to capture metals in acidic culture media conditions. The ability of three yeast species, Cryptococcus agrionensis, Cryptococcus sp. 2, and Coniochaeta fodinicola, to tolerate and capture metals in live cultures has been evaluated. These three yeast species showed high tolerance to low pH and elevated concentrations of metals, thus implying their autochthonous status. Minimal inhibitory concentration (MIC) for growth obtained for these isolates showed elevated tolerance to the six heavy metals evaluated and were significantly higher than those registered for other microorganisms. C. agrionensis was able to capture 15.80 mg (g biomass) of Cu (MIC: 0.22 g L ), Cryptococcus sp. 2 was able to capture 36.25 and 65.28 mg (g biomass) of Ni and Zn , respectively (MIC: 0.56 and 1.68, respectively), and C. fodinicola was able to capture 67.11 mg (g biomass) of Zn (MIC: 3.75). This work reported the ability of yeasts to capture metals in acidic conditions for the first time. We hope that it represents the step-stone for future researches in the ability and metabolism of yeasts form acidic aquatic environment related to metal tolerance and capture.

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“…Taxa with dimorphic life cycles show sacculate membranous caps on the dolipore septum, and tremelloid basidia consisting of four cells with longitudinal to oblique walls. agrionensis, were isolated from glacial waters and acidic environments in Argentina, respectively Russo et al 2010). Cryptococcus species accounted for 50% of the total number of strains isolated from glacial melt water rivers Brought to you by | New York University Bobst Library Technical Services Authenticated Download Date | 6/29/15 8:58 AM in Patagonia (de Garcia et al 2007), with Cr.…”

Section: Tremellalesmentioning

confidence: 99%