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首页> 外文期刊>european journal of phycology >A molecular systematic investigation of the Acrochaetiales (Florideophycidae, Rhodophyta) and related taxa based on nuclear small-subunit ribosomal DNA sequence data
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A molecular systematic investigation of the Acrochaetiales (Florideophycidae, Rhodophyta) and related taxa based on nuclear small-subunit ribosomal DNA sequence data

机译：基于核小亚基核糖体DNA序列数据的杂毛类（Florideophycidae，Rhodophyta）和相关分类群的分子系统研究

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Small-subunit ribosomal DNA (SSU) sequences for 14 members of the rhodophyte order Acrochaetiales were used to generate phylogenetic trees to determine whether the Acrochaetiales is monophyletic and to assess the relationships of acrochaetioid algae to closely related taxa. Within the Acrochaetiales, two strongly supported groups are recognized: one group that includes, in addition to three other species, the type species of the generaAcrochaetium,AudouinellaandRhodochorton; and a second group that includes an unequivocal representative ofColaconemaand nine additional species. The relationships of these groups with the Batrachospermales, Palmariales and Nemaliales were not resolved and the possibility that the Acrochaetiales is polyphyletic was not eliminated. Resolution of relationships for species within these groups was strong in only a few cases, with many of the phylogenetic issues at this level remaining equivocal. Our results do not positionCamontagneain the Acrochaetiales, as has recently been suggested, but strongly ally this genus to the family Rhodothamniellaceae of the Palmariales. The phylogenetic position ofRhododraparnaldia, an alga intermediate between the Acrochaetiales and Batrachospermales, remains unresolved. These molecular results provide a foundation for assessing the taxonomic significance of phenotypic characters (e.g. anatomy, life histories, morphology, phycoerythrin type and plastid details) variously considered taxonomically significant in the Acrochaetiales.
机译：使用红毛目 Acrochaetiales 的 14 个成员的小亚基核糖体 DNA （SSU） 序列生成系统发育树，以确定 Acrochaetiales 是否是单系的，并评估 Acrochaetioid 藻类与密切相关分类群的关系。在Acrochaetiales中，两个得到强烈支持的群体被认可：一个群体，除了其他三个物种外，还包括Acrochaetium属的类型物种，Audouinella和Rhodochorton;第二组包括Colaconema的明确代表和另外九个物种。这些群体与Batrachospermales，Palmariales和Nemaliales的关系没有得到解决，也没有消除Acrochaetiales是多系的可能性。仅在少数情况下，这些群体内物种关系的解决是强有力的，这一水平的许多系统发育问题仍然模棱两可。我们的研究结果并没有像最近所建议的那样将Camontagneain定位为Acrochaetiales，而是将该属与Palmariales的Rhodothamniellaceae科紧密结盟。Rhododraparnaldia（一种介于 Acrochaetiales 和 Batrachospermale 之间的藻类）的系统发育位置仍未解决。这些分子结果为评估表型特征的分类学意义奠定了基础（例如解剖学、生活史、形态学、藻红蛋白类型和质体细节）在杂毛类中被认为具有分类学意义。

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