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首页> 外文期刊>Phycological Research >Molecular, biochemical and morphological data suggest an affiliation of Spongiochrysis hawaiiensis with the Trentepohliales (Ulvophyceae, Chlorophyta)
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Molecular, biochemical and morphological data suggest an affiliation of Spongiochrysis hawaiiensis with the Trentepohliales (Ulvophyceae, Chlorophyta)

机译：分子，生化和形态学数据表明夏威夷海绵体与Trentepohliales（Ulvophyceae，Chlorophyta）有隶属关系

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摘要

The aeroterrestrial, unicellular green alga Spongiochrysis hawaiiensis had been included in the ulvophycean order Cladophorales based on small subunit (SSU) rDNA sequence data, and represents so far the only fully terrestrial member of this order. Other characteristics of S.hawaiiensis that are atypical for Cladophorales include the presence of large amounts of carotenoids and a budding-like mode of cell division. As the position of this terrestrial, unicellular alga in an order of aquatic, multicellular green algae is unusual, we re-evaluated the phylogenetic relationships of this enigmatic organism based on supplementary SSU rDNA sequences as well as novel large ribosomal subunit (LSU) rDNA and internal transcribed spacer (ITS rDNA) sequences. Additionally, we examined several morphological characters of S.hawaiiensis, as well as low molecular weight carbohydrate (LMWC) patterns of S.hawaiiensis and members of the Cladophorales and Trentepohliales as potential chemotaxonomic markers. We found S.hawaiiensis to be uninucleate. The analysis of the LMWC content detected the presence of the polyol erythritol in S.hawaiiensis and in the Trentepohliales, while this compound was missing in the Cladophorales. The phylogenetic analyses of the novel sequences placed S.hawaiiensis in the terrestrial Trentepohliales. This placement is supported by the aeroterrestrial habitat, the presence of large amounts of carotenoids, the uninucleate cells, and the presence of the polyol erythritol as a protective compound against water loss.
机译：基于小亚基（SSU）rDNA序列数据，航空陆地单细胞绿藻夏威夷海绵体已被列入角藻科的角藻，并且是迄今为止唯一的陆地完全成员。夏威夷葡萄球菌不典型的其他特征包括大量类胡萝卜素的存在和细胞分裂的萌芽状模式。由于这种陆生单细胞藻类在水生，多细胞绿藻类中的位置是不寻常的，因此我们根据补充的SSU rDNA序列以及新型大核糖体亚基（LSU）rDNA重新评估了该神秘生物的系统发生关系。内部转录间隔区（ITS rDNA）序列。此外，我们检查了夏威夷葡萄球菌的几种形态学特征，以及夏威夷葡萄球菌的低分子量碳水化合物（LMWC）模式以及作为潜在化学分类标记的枝形目和T形纲成员。我们发现夏威夷沙门氏菌是单核的。 LMWC含量的分析检测到夏威夷葡萄球菌和特兰氏菌中存在多元醇赤藓糖醇，而枝状藻中则缺少该化合物。对新序列的系统发育分析将夏威夷沙门氏菌置于陆地Trentepohliales中。该位置受到以下因素的支持：航空地球栖息地，大量类胡萝卜素，单核细胞的存在以及多元醇赤藓醇作为防止水分流失的保护性化合物的存在。

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