Phylogenetic relationships within Cladophorales (Ulvophyceae, Chlorophyta) inferred from 18S rRNA gene sequences, with special reference to Aegagropila linnaei
Phylogenetic relationships within Cladophorales (Ulvophyceae, Chlorophyta) inferred from 18S rRNA gene sequences, with special reference to Aegagropila linnaei
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DOI：
10.1046/j.1529-8817.2002.01151.x
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发表时间：
2002-06-01
影响因子：
2.9
通讯作者：
Ueda, K
中科院分区：
文献类型：
--
作者：
Hanyuda, T;Wakana, I;Ueda, K
利用核18 S rRNA基因序列对一种淡水绿色绿藻--林氏针毛藻（Aegagropila linnaei，刚毛藻目，石莼科）的系统发育位置进行了研究。这种真菌通常被称为刚毛藻Cladophora aegagropila（L.）Rabenhorst或邵氏刚毛藻Cladophora sauteri（Nees ex Kutz.）库茨根据形态学，它以前被分类为Aegagropila组或Aegagropila亚属，以及刚毛藻属的几个海洋物种。这种分类是不支持目前的系统发育分析，其中两个非常不同的刚毛藻目分支被确认。林奈山羊草与刚毛藻属（Cladophora sp.）Pithophora sp.，Okamurae硬毛藻、Arnoldiella conchophila、Wittrockiella lyallii和Cladophora conchopheria。林奈山羊草与其近缘种在超微结构和生物化学特征上有相似之处，如蛋白核结构、类胡萝卜素组成和细胞壁组成等。淡水物种，包括在分析中，位于两个远亲谱系，表明从海洋到淡水栖息地的适应已经发生了至少两次独立的刚毛藻目。
The phylogenetic position of a freshwater green alga, Aegagropila linnaei (Cladophorales, Ulvophyceae), was investigated using nuclear 18S rRNA gene sequences. This alga has usually been called Cladophora aegagropila (L.) Rabenhorst or Cladophora sauteri (Nees ex Kutz.) Kutz. Based on morphology, it was formerly classified into the section Aegagropila or into the subgenus Aegagropila , together with several marine species of the genus Cladophora. This classification is not supported by the present phylogenetic analyses in which two very distinct Cladophorales clades are recognized. Aegagropila linnaei groups together in a well-supported clade with Cladophora sp., Pithophora sp., Chaetomorpha okamurae , Arnoldiella conchophila , Wittrockiella lyallii , and Cladophora conchopheria. Aegagropila linnaei and its closely related species share some ultrastructural and biochemical characteristics, like pyrenoid structure, carotenoid composition, and cell wall composition. Freshwater species, included in the analysis, were located in two distantly related lineages, indicating that adaptation from a marine to a freshwater habitat has happened at least twice independently in the Cladophorales.