Phylogenetic relationships of the “higher" hamamelids were estimated based on nucleotide sequences of the non coding region of chloroplast trnL-F. Twenty-five species were sampled, representing 24 genera of all eight families of the “higher" hamamelids. A parsimony analysis of data set indicated that the “higher" hamamelids formed a strongly supported clade with 100% bootstrap value in the strict consensus tree. Nothofagus was the basal lineage and the Fagaceae was sister to a well supported core “higher" hamamelids clade containing Myricaceae, Rhoipteleaceae, Juglandaceae, Casuarinaceae, Ticodendraceae and Betulaceae. Three clades were recognized in the core“higher" hamamelids:(1)Casuarina (Ticodendron,(Betulaceae)), (2) Juglandaceae Rhoipteleaceae, and (3) Myricaceae. Compared with the previous studies, familial relationships of the “higher" hamamelids were better resolved.
据叶绿体trn L-F 序列分析“高等”金缕梅类植物的系统发育关系
李睿琦 陈之端* 洪亚平** 路安民
（中国科学院植物研究所系统与进化植物学重点实验室，北京100093）
摘要: 研究对"高等"金缕梅类的8科24属25种植物和外类群Hamamelis两种植物的叶绿体DNA trnL-F区进行了测序,并根据DNA序列对该类植物的系统发育关系进行了分析.结果表明: 所有"高等"金缕梅类植物的科结合成一支, bootstrap 分析支持率为100%,各科之间的关系得到很好分辨.Nothofagus是最基部的一支;山毛榉科(Fagaceae)作为姐妹群与"核心"金缕梅类的科(桦木科Betulaceae,胡桃科Juglandaceae, 木麻黄科Casuarinaceae, 杨梅科Myricaceae, Ticodendraceae 和马尾树科Rhoipteleaceae)组成一支,并得到很强的支持."核心"金缕梅类构成三支,关系如下:(1) Casuarina (Ticodendron, (Betulaceae)), (2) Juglandaceae-Rhoipteleaceae, (3) Myricaceae.本研究显示叶绿体DNA trnL-F区对分辨"高等"金缕梅类科间关系及部分科内的属间关系十分有效.
关键词： trn L-F 区；叶绿体DNA；“高等”金缕梅类；系统发育关系
通讯作者。E-mail: <zhiduan @ ns.ibcas.cn>
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