碎米蕨属(Cheilosoria Trevis.)隶属碎米蕨类, 由于形态上的趋同进化, 使得该类群的系统分类一直存在争议。该研究对该碎米蕨属植物的4种叶绿体DNA序列片段(rbcL/matK/rps4/rps4-trnS)进行PCR扩增和序列分析, 再结合其它相关类群, 用贝叶斯法和最大似然法构建系统树并探讨其系统发育关系。结果表明, 碎米蕨属不是一个单系类群, 旧世界分布的碎米蕨属植物(薄叶碎米蕨除外)均聚在亚洲Cheilanthes群内, 与粉背蕨属(Aleuritopteris Fée)等类群形成不同亚支。该属孢子形态具有明显异质性。薄叶碎米蕨(Cheilosoria tenuifolia (Burm. f.) Trevis.)与亚洲其它碎米蕨属植物的系统位置相距甚远, 且与隐囊蕨(Notholaena hirsuta (Poir.) Desv.)聚为完全支持的分支, 两者可能均为大洋洲起源, 并属于另一类群。美洲和旧世界分布的碎米蕨属植物关系较远, 二者可能代表了不同的演化路线。
Cheilosoria Trevis. (Cheilanthoid, Pteridaceae), is a controversial genus in terms of its phylogenetic taxonomy. In this paper we reconstructed its phylogeny based on four chloroplast DNA sequence fragments (rbcL/matK/ rps4/rps4-trnS) using maximum likelihood methods and Bayesian analysis. The main results are as follows. The genus Cheilosoria Trevis. is not monophyletic. Except Cheilosoria tenuifolia (Burm. f.) Trevis., species of Cheilosoria Trevis. from the Old World were all nested within the Asian Cheilanthes group, forming different subclades with the species of Aleuritopteris Fée etc. Moreover, their spore morphology is heterogenetic. C. tenuifolia (Burm. f.) Trevis. was distantly related to other species of Asian Cheilosoria Trevis. C. tenuifolia (Burm. f.) Trevis. and Notholaena hirsuta (Poir.) Desv. formed a fully supported clade (BP=100%), so the two species may have an Oceania origin and belong to another group. The American species of Cheilosoria allosuroides (Mett.) Trevis. is distantly related to those from the Old World and may represent separate evolutionary lines.
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