A global molecular phylogeny of the fern genus Trichomanes (Hymenophyllaceae) with special reference to stem anatomy
A global molecular phylogeny of the fern genus Trichomanes (Hymenophyllaceae) with special reference to stem anatomy
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DOI：
10.1111/j.1095-8339.2007.00684.x
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发表时间：
2007-09-01
影响因子：
2.4
通讯作者：
Dubuisson, Jean-Yves
中科院分区：
文献类型：
--
作者：
Ebihara, Atsushi;Iwatsuki, Kunio;Dubuisson, Jean-Yves
为了为未来的分类学修订奠定基础并推断 Trichomanes s.l.（两个大型薄膜蕨属之一）的进化特征，使用叶绿体 rbcL 序列进行了分子系统发育分析。采样覆盖了该属在热带和温带地区的大部分全球分布范围，以及主要来自亚洲的 51 个样本，涵盖了所有具有分类学意义的物种。八个选定的性状的进化，被采用作为分类键和/或推定反映形态回归，在检索到的最简约的 rbcL 树上进行了优化，以及对 45 个物种的茎解剖结构的新观察。 rbcL 系统发育中毛虫内检索到的 8 个稳健进化枝与现有分类相冲突。我们的结果还表明，该属的主要诊断特征杯形囊肿在膜叶藻谱系中平行出现，正如该谱系中包含的侧毛虫（以苍白毛毛虫为代表）所证明的那样。退化性状状态在叶大小、茎厚度、根系和茎解剖结构（中柱和皮层）的进化中是同质性不对称的建议可能说明了毛毛虫适应性进化转变的强烈趋势。 (c) 2007 年伦敦林奈学会。
To establish a basis for future taxonomic revisions and to infer the evolutionary traits of Trichomanes s.l., one of two large filmy fern genera, molecular phylogenetic analyses were conducted using chloroplast rbcL sequences. Sampling covered most of the global distribution range of this genus throughout the tropical and temperate zones, as well as all taxonomically significant species by the addition of 51 samples principally from Asia. The evolution of eight selected characters, which were adopted as taxonomic keys and/or putatively reflect morphological regression, was optimized on the retrieved most parsimonious rbcL trees, together with new observations on the stem anatomy of 45 species. The eight robust clades retrieved within Trichomanes in the rbcL phylogeny conflict with the existing classifications. Our results also suggest that the cup-shaped sorus, the primary diagnostic character of the genus, appears in parallel in the Hymenophyllum lineage, as demonstrated by Pleuromanes (typified by Trichomanes pallidum) included in the lineage. The suggestion that the regressive character states are homoplastic apomorphies in the evolution of the frond size, stem thickness, root system, and stem anatomy (stele and cortex) probably illustrates a strong tendency towards adaptive evolutionary transition in Trichomanes. (c) 2007 The Linnean Society of London.