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首页> 外文期刊>Phycological Research >Review: Taxonomy of Nitella (Charales, Charophyceae) based on comparative morphology of oospores and multiple DNA marker phylogeny using cultured material
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Review: Taxonomy of Nitella (Charales, Charophyceae) based on comparative morphology of oospores and multiple DNA marker phylogeny using cultured material

机译：综述：Nitella（Charales，Charophyceae）的分类学，基于卵形的比较形态和使用培养物的多种DNA标记系统发育

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摘要

The genus Nitella is the largest group in the Charales and has the highest diversity of vegetative and oospore morphologies. In his worldwide monograph on the Charales, R. D. Wood characterized the sections and species of Nitella mainly on the basis of vegetative morphology and treated oospore wall morphology as diagnostic at the infraspecific level. Therefore, many species of Nitella exhibiting distinct external morphology of the oospore wall (EMOW) were reduced to infraspecific rank and only 53 of 204 species previously described were recognized within Nitella. However, recent morphological and molecular phylogenetic studies have demonstrated the phylogenetic validity of using EMOW for diagnosing some species of Nitella. More recently, a scanning electron microscopy (SEM) study of internal morphology of the oospore wall (IMOW) and multiple DNA marker analyses using both nuclear and chloroplast gene sequences were conducted to improve our understanding of the taxonomy of Nitella at the species level, on the basis of cultured material of a large number of species. Multiple DNA marker analyses resolved detailed and robust phylogenetic relationships within the genus and demonstrated the taxonomic and phylogenetic significance of IMOW. In addition, they supported the taxonomic decisions based on differences in oospore morphology, suggesting that an integrated approach, involving both SEM studies of the EMOW and IMOW and multiple DNA marker analyses, is appropriate to address problems at lower taxonomic levels within the genus, as well as to construct a natural taxonomic system for the genus. In this paper, recent morphological and molecular phylogenetic studies are reviewed and recent improvements in taxonomy of Nitella are summarized. Moreover, the evolution of morphological features and phylogenetic relationships within Nitella are discussed, focusing especially on oospore morphology.
机译：Nitella属是Charales中最大的一类，其营养和卵形形态的多样性最高。 R. D. Wood在其关于Charales的全球专着中，主要根据植物的形态学对Nitella的切片和物种进行了表征，并将卵孢子壁的形态学用于亚种水平的诊断。因此，表现出卵孢子壁（EMOW）独特的外部形态的许多Nitella物种被降低到亚种等级，并且在Nitella中仅识别出先前描述的204种中的53种。但是，最近的形态学和分子系统发育研究表明，使用EMOW诊断某些Nitella物种的系统发育有效性。最近，通过扫描电子显微镜（SEM）研究了卵壁的内部形态（IMOW），并使用核和叶绿体基因序列进行了多个DNA标记分析，以提高我们对Nitella分类学的了解。大量物种的养殖材料的基础。多种DNA标记分析解决了该属内详细而稳固的系统发生关系，并证明了IMOW的分类学和系统发生意义。此外，他们支持基于卵形形态差异的分类学决策，这表明，包括EMOW和IMOW的SEM研究以及多种DNA标记分析在内的综合方法适用于解决该属中较低分类学水平的问题，因为以及为该属构建自然的分类系统。在本文中，综述了最近的形态学和分子系统发育研究，并总结了Nitella分类学的最新进展。此外，还讨论了Nitella内的形态特征演变和系统发育关系，特别是卵形形态。

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