Ecological Strategies of Snow Molds to Tolerate Freezing Stress

Hashizume, Tamotsu; Xiao, Nan; Yajima, Yuka; Kida, Kenichi; Tokura, Katsuyuki; Murakami, Ryo; Tojo, Motoaki; Matsumoto, Naoyuki

doi:10.1007/978-1-4614-8253-6_24

Cited by 6 publications

(6 citation statements)

References 22 publications

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Section: Resultsmentioning

confidence: 99%

“…Both filamentous basidiomycetes produced extracellular IBPs abundantly (>90–95% of total extracellular proteins) to adapt to freezing environments; however, T. ishikariensis may inhibit mycelial growth at subzero temperatures when IBPs freely diffuse into the extracellular environment [ 10 , 27 ]. Possibly, IBP molecules are bound with EPS, covering the mycelia of T. ishikariensis to protect from freezing damage [ 10 ]. Both basidiomycetes, G. antarctica and T. ishikariensis , produce both EPS and IBPs for frost resistance, but the ratios of EPS to IBPs were contrasting; G. antarctica produced a large amount of EPS and a small amount of IBPs to form frozen colonies.…”

Section: Resultsmentioning

confidence: 99%

“…Previously, we described that ecophysiological strategies for freezing tolerance of filamentous fungi differed among taxa in in the Northern Hemisphere [ 10 ]. Filamentous basidiomycetes such as Typhula ishikariensis secreted abundant ice-binding proteins (IBPs) (>95% of total extracellular proteins) [ 11 ] to keep the extracellular environment unfrozen.…”

Section: Introductionmentioning

confidence: 99%

“…Filamentous basidiomycetes such as Typhula ishikariensis secreted abundant ice-binding proteins (IBPs) (>95% of total extracellular proteins) [ 11 ] to keep the extracellular environment unfrozen. This fungus also produced extracellular polysaccharides (EPS) which covered the hyphae to inhibit the diffusion of IBPs so that thermal hysteresis activity may be maintained [ 10 ]. However, in basidiomycetous yeasts, there are few reports on frost resistance.…”

Section: Introductionmentioning

confidence: 99%

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Basidiomycetous Yeast, Glaciozyma antarctica, Forming Frost-Columnar Colonies on Frozen Medium

et al. 2021

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The basidiomycetous yeast, Glaciozyma antarctica, was isolated from various terrestrial materials collected from the Sôya coast, East Antarctica, and formed frost-columnar colonies on agar plates frozen at −1 °C. Thawed colonies were highly viscous, indicating that the yeast produced a large number of extracellular polysaccharides (EPS). G. antarctica was then cultured on frozen media containing red food coloring to observe the dynamics of solutes in unfrozen water; pigments accumulated in frozen yeast colonies, indicating that solutes were concentrated in unfrozen water of yeast colonies. Moreover, the yeast produced a small quantity of ice-binding proteins (IBPs) which inhibited ice crystal growth. Solutes in unfrozen water were considered to accumulate in the pore of frozen colonies. The extracellular IBPs may have held an unfrozen state of medium water after accumulation in the frost-columnar colony.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Basidiomycetous Yeast, Glaciozyma antarctica, Forming Frost-Columnar Colonies on Frozen Medium

et al. 2021

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“…Pathogenicity is strongly correlated with freezing resistance in oomycetous snow moulds (Hoshino et al 2009(Hoshino et al , 2013b. Fungi in permafrost are characterized by both the presence of natural cryoprotectants such as plant substrates or derivatives in these ecotopes and the ability to utilize their inherent mechanisms of protection (Ozerskaya et al 2009).…”

Section: Evolution Of Cryophilic Fungimentioning

confidence: 99%