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基于ITS序列探讨杜鹃属的亚属和组间系统关系
引用本文:高连明,李德铢,等.基于ITS序列探讨杜鹃属的亚属和组间系统关系[J].Acta Botanica Sinica,2002,44(11):1351-1356.
作者姓名:高连明  李德铢
作者单位:中国科学院昆明植物研究所生物多样性与生物地理学开放研究实验室 昆明650204 (高连明,李德铢,张长芹),中国科学院昆明植物研究所生物多样性与生物地理学开放研究实验室 昆明650204(杨俊波)
基金项目:中国科学院知识创新工程重要方向项目 (KSCX2_1_0 6B)~~
摘    要:首次报道了 15种杜鹃属 (Rhododendron)植物、1种杜香属 (Ledum)植物和Cassiopefastigiata的内转录间隔区(ITS) (包括 5 .8S)序列。加上从GenBank下载的 13种杜鹃属植物和Bajiariaracemosa的ITS序列 ,以C .fastigiata和B .racemosa为外类群 ,用最大简约法对杜鹃属的亚属和组间的系统关系进行了分析。结果表明 :1)杜鹃属是一个单系类群 ,叶状苞亚属为杜鹃属的基部类群 ;2 )杜香属确应归并到杜鹃属中 ,且与有鳞杜鹃亚属有较近的亲缘关系 ;3)有鳞杜鹃亚属和杜香构成一个单系分支 ,该分支是其余无鳞杜鹃花的姐妹群 ;4 )由无鳞杜鹃花组成的一个分支的内部支持率较低 ,其中常绿杜鹃亚属和映山红亚属均为内部支持率很高的单系类群 ,而羊踯躅亚属和马银花亚属均为多系类群 ;5 )在马银花亚属中 ,长蕊杜鹃组和马银花组均分别得到强烈支持 ,马银花组与异蕊杜鹃亚属可能构成姐妹群关系 ,异蕊杜鹃亚属和马银花组组成的一个分支可能与映山红亚属构成姐妹群关系。

关 键 词:杜鹃属  内转录间隔区(ITS)  系统发育  属下系统关系

Infrageneric and Sectional Relationships in the Genus Rhododendron (Ericaceae) Inferred from ITS Sequence Data
Authors:GAO Lian_Ming  LI De_Zhu  ZHANG Chang_Qin  YANG Jun_Bo
Institution:GAO Lian_Ming,LI De_Zhu *,ZHANG Chang_Qin,YANG Jun_Bo
Abstract:The internal transcribed spacer (ITS) regions of nuclear ribosomal DNA (including 5.8S rRNA) of 15 Rhododendron species, representing most sections of the genus, one Ledum species and Cassiope fastigiata were sequenced. Together with the ITS sequences of 13 selected Rhododendron species and Bejaria racemosa downloaded from GenBank, we explored the infrageneric and sectional relationships of this important North Temperate genus by employing maximum_parsimony analysis using PAUP software. C. fastigiata and B. racemosa were designated as outgroups. The ITS_based tree inferred that: (1) Rhododendron was a well_supported monophyletic group, while subg. Therorhodion was basal to the rest of the genus; (2) Ledum was a member of Rhododendron , and its close relationship with the lepidote rhododendron was confirmed; (3) the lepidote rhododendron plus Ledum formed a strongly_supported monophyletic clade which was sister to the rest of the elepidote rhododendron; (4) the elepidote rhododendron formed a weakly_supported clade within which the monophyly of subg. Hymenanthes and subg. Tsutsusi were strongly supported, while subg. Pentanthera and subg. Azaleastrum were polyphyletic; and (5) the monophyly of sect. Choniastrum (subg. Azaleastrum ) was strongly_supported, while subg. Tsutsusi could be sister to a weakly_supported clade composed of two sampled species of sect. Azaleastrum (subg. Azaleastrum ) together with R. semibarbatum of subg. Mumeazalea .
Keywords:Rhododendron  internal transcribed spacer (ITS)  phylogeny  infrageneric relationships
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