Mrakia psychrophila sp. nov., a new species isolated from Antarctic soil

Ming-xiu, Xin; Zhou, Pengyu

doi:10.1631/jzus.2007.b0260

Cited by 44 publications

(25 citation statements)

References 23 publications

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“…Mrakia psychrophila was first described by Xin and Zhou (2007) from soil samples collected from Fildes Peninsula, Antarctica and its optimum and MGTs are at 10 and 18°C, respectively. The first integrated study on the genomic, transcriptomic and proteomic perspectives of M. psychrophila provided insights into the cold adaptation mechanism of psychrophilic fungi (Su et al 2016).…”

Section: Representative Cold-adapted Fungal Speciesmentioning

confidence: 99%

Living strategy of cold-adapted fungi with the reference to several representative species

et al. 2017

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Our planet is dominant with cold environments that harbour enormously diverse cold-adapted fungi comprising representatives of all phyla. Investigation based on culture-dependent and independent methods has demonstrated that cold-adapted fungi are cosmopolitan and occur in diverse habitants and substrates. They live as saprobes, symbionts, plant and animal parasites and pathogens to perform crucial functions in different ecosystems. Pseudogymnoascus destructans caused bat white-nose syndrome and Ophiocordyceps sinensis as Chinese medicine are the representative species that have significantly ecological and economic significance. Adaptation to cold niches has made this group of fungi a fascinating resource for the discovery of novel enzymes and secondary metabolites for biotechnological and pharmaceutical uses. This review provides the current understanding of living strategy and ecological functions of cold-adapted fungi, with particular emphasis on how those fungi overcome the extreme low temperature and perform their ecological function.

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Section: Representative Cold-adapted Fungal Speciesmentioning

confidence: 99%

Living strategy of cold-adapted fungi with the reference to several representative species

et al. 2017

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“…Psychrophilic and psychrotolerant fungi significantly contribute to soil microbial biomass, playing a key role in decomposition cycles in cold ecosystems (Margesin et al ., ; Xin and Zhou, ). These organisms present several adaptations in their membranes, enzymatic systems and genes of great biotechnological potential (Margesin and Schinner, ).…”

Section: Introductionmentioning

confidence: 99%

Polyphenolic substrates and dyes degradation by yeasts from 25 de Mayo/King George Island (Antarctica)

Rovati

Pajot

Ruberto

et al. 2013

Yeast

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Antarctica offers a range of extreme climatic conditions, such as low temperatures, high solar radiation and low nutrient availability, and constitutes one of the harshest environments on Earth. Despite that, it has been successfully colonized by 'cold-loving' fungi, which play a key role in decomposition cycles in cold ecosystems. However, knowledge about the ecological role of yeasts in nutrient or organic matter recycling/ mineralization remains highly fragmentary. The aim of this work was to study the yeast microbiota in samples collected on 25 de Mayo/King George Island regarding the scope of their ability to degrade polyphenolic substrates such as lignin and azo dyes. Sixty-one yeast isolates were obtained from 37 samples, including soil, rocks, wood and bones. Molecular analyses based on rDNA sequences revealed that 35 yeasts could be identified at the species level and could be classified in the genera Leucosporidiella, Rhodotorula, Cryptococcus, Bullera and Candida. Cryptococcus victoriae was by far the most ubiquitous species. In total, 33% of the yeast isolates examined showed significant activity for dye decolorization, 25% for laccase activity and 38% for ligninolytic activity. Eleven yeasts did not show positive activity in any of the assays performed and no isolates showed positive activity across all tested substrates. A high diversity of yeasts were isolated in this work, possibly including undescribed species and conspicuous Antarctic yeasts, most of them belonging to oligotrophic, slow-growing and metabolically diverse basidiomycetous genera.

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“…the ability to grow and reproduce well at temperatures around 0 u C (Morita, 1975;Margesin et al, 2008), is a typical feature of the teliospore-producing genus Mrakia; the lowest growth temperature for Mrakia strains was reported to be 212 u C (Panikov & Sizova, 2007). Members of this genus have been isolated from numerous low-temperature environments in various regions, such as forest substrates in European Russia, glacier-preserved fossil lichens in Greenland, Antarctic soil or snow, glacial meltwater rivers in Patagonia, Argentina, and alpine Italian subglacial sediments, ice and meltwater, but also from frozen fish in Japan and frozen yoghurt in Brazil (Fell & Statzell-Tallman, 1998;Moreira et al, 2001;Bab'eva et al, 2002;Xin & Zhou, 2007;Turchetti et al, 2008). Some strains related to the species Mrakia frigida produce cold-active pectinolytic enzymes (Barnett et al, 2000;Nakagawa et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Mrakiella cryoconiti gen. nov., sp. nov., a psychrophilic, anamorphic, basidiomycetous yeast from alpine and arctic habitats

Margesin

Fell

2008

INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLO

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). Two representatives were isolated from alpine glacier cryoconite and from northern Siberian sediment. Physiological and biochemical properties are similar to characteristics shared by members of the genus Mrakia, although sexual reproduction is absent. Mrakiella cryoconiti strains are psychrophilic and produce cold-active pectate lyase. Sequence analyses of the ITS and 26S rRNA D1/D2 regions indicated that these strains represent a distinct taxon within the Mrakia clade of the order Cystofilobasidiales, class Tremellomycetes and phylum Basidiomycota. On the basis of phenotypic and genotypic characteristics, Cryptococcus aquaticus (a member of the Mrakia clade) is transferred to the newly described genus as Mrakiella aquatica comb. nov. INTRODUCTIONThe order Cystofilobasidiales (Fell et al., 1999) includes teleomorph and anamorph genera. Psychrophily, i.e. the ability to grow and reproduce well at temperatures around 0 u C (Morita, 1975;Margesin et al., 2008), is a typical feature of the teliospore-producing genus Mrakia; the lowest growth temperature for Mrakia strains was reported to be 212 u C (Panikov & Sizova, 2007). Members of this genus have been isolated from numerous low-temperature environments in various regions, such as forest substrates in European Russia, glacier-preserved fossil lichens in Greenland, Antarctic soil or snow, glacial meltwater rivers in Patagonia, Argentina, and alpine Italian subglacial sediments, ice and meltwater, but also from frozen fish in Japan and frozen yoghurt in Brazil (Fell & Statzell-Tallman, 1998;Moreira et al., 2001;Bab'eva et al., 2002;Xin & Zhou, 2007;Turchetti et al., 2008). Some strains related to the species Mrakia frigida produce cold-active pectinolytic enzymes (Barnett et al., 2000;Nakagawa et al., 2004). These enzymes could be useful for a wide range of applications, such as the food industry for juice clarification below 5 u C or low-temperature pre-treatment of wastewater containing pectic substances. Two cold-active pectate-lyaseproducing strains (Margesin et al., 2005) were previously assigned to Mrakia frigida on the basis of internal transcribed spacer (ITS) and large-subunit (LSU) rRNA gene sequences. However, detailed investigation of the strains demonstrated the absence of teliospore production, which is characteristic of the genus Mrakia. In addition, ITS and LSU rRNA gene D1/D2 sequences indicate that these strains belong to a hitherto unknown genus and species, for which the name Mrakiella cryoconiti gen. nov., sp. nov. is proposed. METHODSSample collection and isolation. Yeast strain A15T was isolated from alpine glacier cryoconite collected from the Stubaier glacier near Innsbruck in Tyrol, Austria (altitude 2900 m above sea level) (Margesin et al., 2002). Strain AG25 originated from a sediment sample containing mud, spring water and moss, which was collected in the Gyda peninsula in northern Siberia (Gounot, 2001). Yeasts were maintained on R2A agar (Difco) plates; long-term storage was performed in 10 % (w/v) skimmed milk at 280 uC.Physiolog...

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Mrakia psychrophila sp. nov., a new species isolated from Antarctic soil

Cited by 44 publications

References 23 publications

Living strategy of cold-adapted fungi with the reference to several representative species

Living strategy of cold-adapted fungi with the reference to several representative species

Polyphenolic substrates and dyes degradation by yeasts from 25 de Mayo/King George Island (Antarctica)

Mrakiella cryoconiti gen. nov., sp. nov., a psychrophilic, anamorphic, basidiomycetous yeast from alpine and arctic habitats

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