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首页> 外文期刊>Phycological Research >Phylogeny, morphology, and physiology of Micractinium strains isolated from shallow ephemeral freshwater in Antarctica
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Phylogeny, morphology, and physiology of Micractinium strains isolated from shallow ephemeral freshwater in Antarctica

机译：南极浅水短暂淡水分离出的Micractinium菌株的系统发生，形态和生理

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摘要

Cryotolerant eukaryotic microalgae were isolated from meltwater streams on Ardley Island and King George Island in Antarctica, and their morphological, molecular, and physiological characteristics were investigated. Owing to their simple morphology, distinctive characters were not observed with neither light microscopy nor transmission electron microscopy. However, molecular phylogenetic inferences drawn from the concatenated small subunit rRNA and internal transcribed spacer sequence data indicated that these microalgal strains belonged to the genus Micractinium. All the Micractinium strains showed cryotolerant properties, while their optimum growth temperature was around 20 degrees C. Similar to other cryotolerant organisms, these Antarctic microalgae also contained a higher ratio of polyunsaturated fatty acids to saturated fatty acids. In this study, new Antarctic Micractinium spp. were discovered and added to the culture collection. These cryotolerant strains may serve as a promising source of nutritionally important linoleic (C-18:2 6) and -linolenic (C-18:3 3) acids.
机译：从南极洲的阿德利岛和乔治国王岛的融水流中分离了耐低温真核微藻，并对它们的形态，分子和生理特性进行了研究。由于其简单的形态，光学显微镜和透射电子显微镜均未观察到明显的特征。但是，从级联的小亚基rRNA和内部转录的间隔区序列数据得出的分子系统发育推断表明，这些微藻菌株属于Micractinium属。所有Micractinium菌株均显示出耐低温特性，而其最佳生长温度约为20摄氏度。与其他耐低温生物类似，这些南极微藻还含有较高比例的多不饱和脂肪酸与饱和脂肪酸。在这项研究中，新的南极菌属。被发现并添加到文化收藏中。这些耐低温菌株可以作为营养上重要的亚油酸（C-18：2 6）和-亚麻酸（C-18：3 3）的有前途的来源。

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