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植物研究  2015 

金粉蕨属的分子系统学研究——基于5种叶绿体DNA序列片段

DOI: 10.7525/j.issn.1673-5102.2015.05.005, PP. 665-671

Keywords: 金粉蕨属,系统分类,rbcL/atpA/matK/trnL-trnF/trnG-trnR

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Abstract:

?金粉蕨属(OnychiumKaulfuss)隶属广义凤尾蕨科中的凤尾蕨亚科。迄今为止,该属属下分组及种间界定等仍有诸多问题亟待解决。本研究选取5个叶绿体DNA序列片段(rbcL/atpA/matK/trnL-trnF/trnG-trnR),采用最大似然法(ML)和贝叶斯法(BI)构建金粉蕨属的系统发育树。结果表明:(1)金粉蕨属的9个成员被分置于两大支上。其中野雉尾金粉蕨(Onychiumjaponicum(Thunberg)Kunze)、西藏金粉蕨(O.tibeticumChing&S.K.Wu)、木坪金粉蕨(O.moupinenseChing)、湖北金粉蕨(O.moupinensevar.ipii(Ching)K.H.Shing)、栗柄金粉蕨(O.japonicumvar.lucidum(D.Don)Christ)、黑足金粉蕨(O.cryptogrammoidesChrist)、繁羽金粉蕨(O.plumosumChing)聚为一支;而金粉蕨(O.siliculosum(Desvaux)C.Christensen)和蚀盖金粉蕨(O.tenuifronsChing)则聚为另一支,可为该属的属下分组提供分子系统学证据;(2)野雉尾金粉蕨与栗柄金粉蕨在系统树中并没有聚在一起,而是被其它类群分割开来,不支持将后者作为野雉尾金粉蕨的变种,建议将栗柄金粉蕨提升为种的等级;(3)系统树上木坪金粉蕨与湖北金粉蕨的样本聚在一个细支上,支持《中国植物志》将湖北金粉蕨作为木坪金粉蕨变种的分类处理;(4)西藏金粉蕨与野雉尾金粉蕨聚在一起,并得到较高的支持,说明两者的关系近缘。

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