Phylogenetic relationships and neotenic evolution of Metzgeriopsis (Lejeuneaceae) based on chloroplast DNA sequences and morphology
Phylogenetic relationships and neotenic evolution of Metzgeriopsis (Lejeuneaceae) based on chloroplast DNA sequences and morphology
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DOI：
10.1111/j.1095-8339.2006.00531.x
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发表时间：
2006-07-01
影响因子：
2.4
通讯作者：
Heinrichs, Jochen
中科院分区：
文献类型：
--
作者：
Gradstein, S. Robbert;Wilson, Rosemary;Heinrichs, Jochen
摘要基于rbcL基因序列、叶绿体DNA trl - f区序列和形态分析，研究了叶苔科最大的叶苔科单菌体成员——亚洲野苔（Marchantiophyta）的系统位置。Metzgeriopsis在系统发育上并不是像以前所建议的那样从Lejeuneaceae的其他分类群中分离出来的，而是嵌套在Cololejeunea中。这两个属有许多共同的形态特征，特别是孢子体一代，这是新描述的。Metzgeriopsis和Cololejeunea是Tuyamaella-Cololejeunea分支的成员，其特点是新时代的特征，可能是为了适应热带雨林中短暂的栖息地而进化的。三种不同类型的迟发性发生在这个分支中，这显然是由多个异时事件引起的。在Lejeuneaceae中，原幼期发育是Metzgeriopsis所特有的，显然是由初级幼期祖先进化而来的。简要回顾了苔藓植物原丝体发育的发生，并将其分为两种类型：具有持久的菌状原丝体的物种和具有持久的丝状原丝体的物种。菌体型是非常罕见的，是附生苔类植物所特有的，而丝状型则更为常见，是许多陆生苔藓植物的特征，包括罕见的原生苔藓属。新组合棘球蚴（Cololejeunea metzgeriopsis k.i.g ebel）梳。11月被提议。(c) 2006年伦敦林奈学会。
The systematic position of the enigmatic Asiatic liverwort Metzgeriopsis pusilla (Marchantiophyta), the single thalloid member of the largest family of leafy liverworts, Lejeuneaceae, was investigated based on sequences of the rbcL gene and the trnL-F region of chloroplast DNA, and morphology. Metzgeriopsis is not phylogenetically isolated from other taxa of Lejeuneaceae, as previously suggested, but is nested within Cololejeunea. The two genera share many morphological features, especially in the sporophyte generation, which is newly described. Metzgeriopsis and Cololejeunea are members of the Tuyamaella-Cololejeunea clade, characterized by neotenic features that probably evolved as adaptations to ephemeral habitats in tropical rain forests. Three different types of neoteny occur in this clade, which apparently originated by multiple heterochronic events. Within Lejeuneaceae, protonemal neoteny is unique to Metzgeriopsis and apparently resulted by evolution from a primary neotenic ancestor. The occurrence of protonemal neoteny in bryophytes is briefly reviewed and two types are recognized: species having a persistent thalloid protonema and species having a persistent filamentous protonema. The thalloid type is very rare and exclusive to epiphyllous liverworts, whereas the filamentous type is much more common and is characteristic of many terrestrial bryophytes, including the rare genus Protocephalozia. The new combination Cololejeunea metzgeriopsis K. I. Goebel) comb. nov. is proposed. (c) 2006 The Linnean Society of London.