Molecular Evidence for the Wide Distribution of Two Lineages of Terrestrial Green Algae (Chlorophyta) over Tropics to Temperate Zone
Molecular Evidence for the Wide Distribution of Two Lineages of Terrestrial Green Algae (Chlorophyta) over Tropics to Temperate Zone
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DOI：
10.5402/2012/795924
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发表时间：
2012-09
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影响因子：
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通讯作者：
Ladislav Hodač;C. Hallmann;Helen Rosenkranz;Fabian Faßhauer;T. Friedl
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作者：
Ladislav Hodač;C. Hallmann;Helen Rosenkranz;Fabian Faßhauer;T. Friedl
环境克隆和培养菌株的18S rDNA序列的系统发育分析揭示了广泛分布的两个陆上绿色藻类谱系，Jenufa和Xylochloris，最近在东南亚的热带雨林中描述。Jenufa（绿藻纲）的一个新谱系，与J. minuta最密切相关，甚至是同种，由欧洲起源的序列形成。来自厄瓜多尔和巴拿马的另外三个序列形成了Jenufa的另外两个谱系。另一个支系是不规则木绿球藻（Xylochloris irregularis）的近亲，可能代表该属的一个新种，与迄今为止唯一描述的种X.不规则的它包括两个不同的分支，每个分支包含来自德国和厄瓜多尔的几乎相同的序列。这两个属的新序列的分析允许假定的偏好J. minuta地上生长的岩石或人工硬基板结合显着的适应延长黑暗的时间，而Xylochloris可能更喜欢发生在树皮或土壤中。
Phylogenetic analyses of 18S rDNA sequences from environmental clones and culture strains revealed a widespread distribution of two subaerial green algal lineages, Jenufa and Xylochloris, recently described from rainforests in southeast Asia. A new lineage of Jenufa (Chlorophyceae), most closely related to or even conspecific with J. minuta, was formed by sequences of European origin. Two more lineages of Jenufa were formed by three additional sequences from Ecuador and Panama. The other lineage was a close relative of Xylochloris irregularis (Trebouxiophyceae), probably representing a new species of the genus and distinct from the only so far described species, X. irregularis. It comprised two distinct clades each containing almost identical sequences from Germany and Ecuador. Analyses of the new sequences for both genera allowed to presume a preference of J. minuta to subaerial growth on rock or artificial hard substrates combined with a remarkable adaptation to extended periods of darkness, whereas Xylochloris may preferably occur on tree bark or in the soil.