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首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >Weighted morphology: a new approach towards phylogenetic assessment of Nostocales (Cyanobacteria)
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Weighted morphology: a new approach towards phylogenetic assessment of Nostocales (Cyanobacteria)

机译：加权形态学：一种对结节藻（蓝藻）进行系统发育评估的新方法

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摘要

The classification of order Nostocales (Cyanobacteria) and inter relationships of morphologically similar taxa is still debatable due to ever changing morphological features. No attempt has been made to improve the morphological taxonomy despite the fact that it is the morphology that represents the totality of genes. To test the validity of morphological taxonomy and fine tune the phylogenetic relationships within the order Nostocales a new weighted morphology approach was applied by using 76 isolates and their 16S rRNA gene sequences. Further, the study was extended with morphological data set of the remaining 232 taxa for which no molecular data are yet available. Trichome aggregation, heterocyst shape, and akinete shape are suggested as important and stable features for identification. At 30 % weight assignment to the selected morphological characters, morphological taxonomy found 36 % compatible with 16S tree. Adding weight to the morphological characters considerably improved the congruence between the morphology and 16S rRNA-based phylogenetic trees of the order Nostocales. When the weighting procedure was extended to all the Nostocalean members irrespective of molecular data availability, it was found that Nostoc sphaericum and Nostoc microscopicum closely assembled in a single clade. Closer arrangement of Aulosira and Nodularia represent the subfamily aulosirae (Bornet and Flahault Ann Sci Nat Bot 7:223-224, 1888) while taxonomic affiliation of Cylindrospermum with Nostoc, Anabaena, and Raphidiopsis representing the subfamily anabaenae (Bornet and Flahault Ann Sci Nat Bot 7:223-224, 1888) was resolved.
机译：由于形态特征的不断变化，仍然需要对孔雀菌（蓝藻）的分类以及形态相似的类群之间的相互关系进行辩论。尽管实际上是代表基因总数的形态，但并未尝试改善形态学分类。为了测试形态分类学的有效性并微调Nostocales顺序内的系统发生关系，通过使用76个分离株及其16S rRNA基因序列，采用了一种新的加权形态学方法。此外，该研究扩展了剩余232个分类单元的形态学数据集，而该数据集尚无分子数据。提示，Trichome聚集，异卵囊形状和akinete形状是重要且稳定的识别特征。在为选定的形态特征分配30％的权重时，形态分类学发现36％的树与16S树兼容。增加形态特征的权重大大改善了形态学和Nostocales级的基于16S rRNA的系统发育树之间的一致性。当将加权过程扩展到所有Nostocalean成员时，无论分子数据的可用性如何，都发现球形的Nostoc sphaericum和Nostoc microscopicum紧密地组装在单个分支中。 Aulosira和Nodularia的较近排列代表aulosirae家族（Bornet和Flahault Ann Sci Nat Bot 7：223-224，1888年），而Cylindrospermum与Nostoc，Anabaena和Raphidiopsis的分类学隶属关系代表了Anabaenae的亚家族（Bornet和Natharia Bothault） 7：223-224，1888）已解决。

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