Leave it to the leaves: A molecular phylogenetic study of malaxideae (Epidendroideae, Orchidaceae)
Leave it to the leaves: A molecular phylogenetic study of malaxideae (Epidendroideae, Orchidaceae)
复制标题
DOI：
10.3732/ajb.92.6.1025
复制
发表时间：
2005-06-01
影响因子：
3
通讯作者：
Cameron, KM
中科院分区：
文献类型：
--
作者：
Cameron, KM
收集了71个兰科植物的核ITS序列和叶绿体matK序列。得到的分支图分辨率很高，并得到了刀切分析的很好支持。这表明传统的以花形态特征为分类依据的分类体系并不能反映这些类群的演化历史。相反，部落被分成两大分支：一个是陆生物种，另一个是附生植物。在附生的分支中，具有侧向压扁叶的分类群(Oberonia)是单系的，而其余的分类群(Liparis Proparte)具有拉长的复叶，并形成至少两个额外的单系谱系的副系等级。在陆生分支中，具有褶皱叶的分类群(Liparis p.p.和Malax p.p.)清楚地与具有复叶的分类群分开(Liparis p.p.和Malaxp.)。虽然进一步的分类单元样本应该在命名改变之前进行，但显然，马拉松亚科至少需要划分为7个属。此外，从附生习性向陆生习性的转变仅在马拉松亚科发生过一次，并再次证明了营养重于生殖特征在兰科某些类群分类中的价值。
Nuclear ITS and plastid matK sequences were collected for 71 taxa of Malaxideae (Orchidaceae). Resulting cladograms are highly resolved and well supported by jackknife analyses. These indicate that the traditional classification system of the tribe using characters primarily related to floral morphology does not reflect the evolutionary history of these taxa. Rather, the tribe is split into two major clades: one of terrestrial species and another of epiphytes. Within the epiphytic clade, taxa with laterally compressed leaves (Oberonia) are monophyletic, whereas the remaining taxa (Liparis pro parte) have elongate conduplicate leaves and form a paraphyletic grade of at least two additional monophyletic lineages. Within the terrestrial clade, taxa with plicate leaves (Liparis p.p. and Malaxis p.p.) clearly separate from taxa with conduplicate leaves (Liparis p.p. and Malaxis p.p.). Although further taxon sampling should take place before nomenclature is changed, it seems evident that Malaxideae will need to be divided into at least seven genera. Furthermore, the transition from epiphytic to terrestrial habit is documented to have occurred only once in Malaxideae, and the value of vegetative over reproductive features in classifying some groups of orchids is again demonstrated.