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Phylogenetics and biogeography of eastern Asian-North American disjunct genus Pachysandra (Buxaceae) inferred from nucleotide sequences
引用本文:李建华,Zhihua JIAO.Phylogenetics and biogeography of eastern Asian-North American disjunct genus Pachysandra (Buxaceae) inferred from nucleotide sequences[J].植物分类学报,2009,47(3):191-201.
作者姓名:李建华  Zhihua JIAO
作者单位:1. Arnold Arboretum of Harvard University, 22 Divinity Avenue, Cambridge, MA 02138, USA;2. School of Chemical and Environmental Engineering, China University of Mining and Technology, 11 Xueyuan Road, Haidian District, Beijing, China;
基金项目:Acknowledgements We thank Patrick Lynch of Longwood Gardens for providing materials for P. procumbens and P. terminalis, and Margaret Frank for laboratory assistance.
摘    要:Pachysandra is an eastern Asian-North American disjtunct genus with three species, two in eastern Asia (Pachysandra axillaris and Pachysandra terminalis) and one in eastern North America (Pachysandra procurnbens). Although morphological and cytological studies suggest a close affinity of Pprocumbens with P axillaris, molecular data from nuclear and chloroplast DNA regions have provided conflicting signals. In this study, we tested previous phylogenetic hypotheses using sequences of nuclear ribosomal DNA internal transcribed spacers and chloroplast ndhF gene from multiple individuals of each of the three species. We also estimated the time of divergence between eastem Asia and eastern North America. Our results support the morphological and cytological conclusion that P procumbens is more closely related to P axillaris than to P terminalis. The estimated time of divergence of P axillaris and P procumbens was 14.6±5.5 mya, consistent with estimates from many other eastern Asian-North American disjunct genera. The migration of Pachysandra populations from eastern Asia to North America might have occurred by way of the North Atlantic land bridge.

关 键 词:北美东部  核苷酸序列  系统发育  金丝枣  生物地理学  东亚  间断  叶绿体DNA
收稿时间:2008-8-18
修稿时间:2008-12-18

Phylogenetics and biogeography of eastern Asian-North American disjunct genus Pachysandra (Buxaceae) inferred from nucleotide sequences
Zhi-hua JIAO,Jian-hua LI.Phylogenetics and biogeography of eastern Asian-North American disjunct genus Pachysandra (Buxaceae) inferred from nucleotide sequences[J].Acta Phytotaxonomica Sinica,2009,47(3):191-201.
Authors:Zhi-hua JIAO  Jian-hua LI
Abstract:Pachysandra is an eastern Asian-North American disjunct genus with three species, two in eastern Asia (Pachysandra axillaris and Pachysandra terminalis) and one in eastern North America (Pachysandra procumbens). Although morphological and cytological studies suggest a close affinity of Pprocumbens with P axillaris, molecular data from nuclear and chloroplast DNA regions have provided conflicting signals. In this study, we tested previous phylogenetic hypotheses using sequences of nuclear ribosomal DNA internal transcribed spacers and chloroplast ndhF gene from multiple individuals of each of the three species. We also estimated the time of divergence between eastern Asia and eastern North America. Our results support the morphological and cytological conclusion that P procumbens is more closely related to P axillaris than to P terminalis. The estimated time of divergence of P axillaris and P procumbens was 14.64-5.5 mya, consistent with estimates from many other eastern Asian-North American disjunct genera. The migration of Pachysandra populations from eastern Asia to North America might have occurred by way of the North Atlantic land bridge.
Keywords:Buxaceae  divergence time  ndhF  nrDNA ITS  Pachysandra
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