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首页> 外文期刊>Polar biology >Endophytic symbiont yeasts associated with the Antarctic angiosperms Deschampsia antarctica and Colobanthus quitensis
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Endophytic symbiont yeasts associated with the Antarctic angiosperms Deschampsia antarctica and Colobanthus quitensis

机译：与南极被子植物Deschampsia antarctica和Colobanthus quitensis相关的内生共生酵母

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摘要

Fungal diversity in Antarctic seems to be greater than what is known and remains largely unexplored. In this study, we identified the endophytic symbiont yeasts associated with leaves of the angiosperms Deschampsia antarctica and Colobanthus quitensis living on King George Island, Antarctica using a culture-based approach. One hundred and twelve yeast isolates were obtained from the tissue of the different plants sampled. These yeasts were identified using sequencing of the D1/D2 domains of the LSU region of the rRNA gene as Cryptococcus victoriae, Cystobasidium laryngis, Rhodotorula mucilaginosa, Sporidiobolus ruineniae and Leucosporidium aff. golubevii. The psychrophilic yeast C. victoriae was the most abundant species associated with the two angiosperms. Cystobasidium laryngis occurs only in the leaves of D. antarctica. In contrast, R. mucilaginosa, S. ruineniae and L. aff. golubevii occurred only in C. quitensis. Phylogenetic analysis indicates the Antarctic endophytic yeast strains are closely related to taxa obtained from substrates located in different habitats of the world. However, the endophytic yeast C. victoriae was closely related to psychrophilic taxa isolated from Antarctica, but also from the Arctic, Alpine and Himalayan environments. The abundance of endophytic yeasts associated with Antarctic angiosperms suggests a possible symbiotic relationship with their plant hosts, which may provide shelter and growing conditions suitable for the yeasts' survival, dispersal and colonization other Antarctic environments. In contrast, the endophytic yeasts might directly or indirectly promote the fitness of their host plants by producing metabolites beneficial to plant survival in the extreme environments of Antarctica.
机译：南极的真菌多样性似乎比已知的更大，并且在很大程度上尚未得到开发。在这项研究中，我们使用基于文化的方法鉴定了与被子植物Deschampsia antarctica和Colobanthus quitensis的叶子相关的内生共生酵母，它们生活在南极洲国王乔治岛。从取样的不同植物的组织中获得了112株酵母分离株。使用rRNA基因的LSU区的D1 / D2结构域的测序鉴定了这些酵母，这些基因分别是维多利亚隐球菌，喉蓝藻，粘液红假单胞菌，乌头假单胞菌和隐孢子虫。 golubevii。嗜冷酵母C. victoriae是与两个被子植物相关的最丰富的物种。喉胞蓝单胞菌仅发生在南极D.的叶子中。相比之下，R。mucilaginosa，S. Ruineae和L. aff.。 golubevii仅在C. quitensis中发生。系统发育分析表明，南极内生酵母菌株与从世界不同生境的基质获得的分类单元密切相关。然而，内生的酵母C. victoriae与从南极洲，也从北极，高山和喜马拉雅环境中分离出来的嗜冷类群密切相关。与南极被子植物相关的大量内生酵母表明与它们的植物宿主之间可能存在共生关系，这可能提供适合酵母生存，散布和定居于其他南极环境的庇护所和生长条件。相反，内生酵母可能通过产生有益于南极极端环境中植物生存的代谢产物来直接或间接促进其宿主植物的适应性。

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  • 来源
    《Polar biology》 |2017年第1期|177-183|共7页
  • 作者

    Santiago Iara F.; Rosa Carlos A.; Rosa Luiz H.;

  • 作者单位

    Univ Fed Minas Gerais, Dept Microbiol, BR-31270901 Belo Horizonte, MG, Brazil;

    Univ Fed Minas Gerais, Dept Microbiol, BR-31270901 Belo Horizonte, MG, Brazil;

    Univ Fed Minas Gerais, Dept Microbiol, BR-31270901 Belo Horizonte, MG, Brazil;

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  • 正文语种 eng
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  • 关键词

    Antarctica; Endophytes; Extremophile; Symbiosis;

    机译：南极洲;内生菌;极端微生物;共生;

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