用matK序列分析探讨木兰属植物的系统发育关系  

The utility of matK gene in the phylogenetic analysis of the genus Magnolia

作　　者：王亚玲[1] 李勇[2] 张寿洲[2] 余兴生 

机构地区：[1]西北农林科技大学生命科学学院,陕西杨凌712100 [2]深圳仙湖植物园,深圳518004

出　　处：《植物分类学报》2006年第2期135-147,共13页Acta Phytotaxonomica Sinica

摘　　要：用木兰科Magnoliaceae57种植物的matK基因序列构建了该科的系统发育分支图。结果表明:(1)木兰属MagnoliaL.是一个因为性状的趋同演化而建立的多系类群;(2)木兰亚属subgen.Magnolia和玉兰亚属subgen.Yulania(Spach)Reichenb.亲缘关系较远,支持将后者从该属中分出建立玉兰属YulaniaSpach,木兰亚属作为木兰属保留;(3)木兰亚属的sect.SplendentesDandyexVazquez组与皱种组sect.RytidospermumSpach的两个美洲种M.macrophyllaMichaux和M.dealbataZucc.亲缘关系较近,荷花玉兰组sect.TheorhodonSpach与常绿组sect.GwillimiaDC.的亲缘关系较近;(4)盖裂木属TalaumaJuss.可以成立,而其分布于亚洲的BlumianaBlume组可归入木兰属;(5)拟单性木兰属ParakmeriaHu&Cheng、华盖木属ManglietiastrumLaw以及单性木兰属Kmeria(Pierre)Dandy形成一个单系群,与玉兰亚属和含笑属MicheliaL.的亲缘关系较近。花的着生位置不足以作为木兰科的分族依据,含笑族Michelieae和木兰族Magnolieae的特征及其界定应做修改。将玉兰亚属从木兰属分出后,木兰属与含笑属无性状交叉,成为两个区别明显的属。A phylogenetic analysis of the Magnoliaceae was performed based on sequence data of the chloroplast matK gene in 57 species representing 11 genera. The results show that （1） the genus Magnolia might be a polyphyletic group; （2） Magnolia subgenus Yulania should be elevated to the genetic rank; （3） the section Splendentes in Magnolia subgenus Magnolia had a very close relationship with the two American species in the section Rytidospermum, M. macrophylla and M. dealbata, and the section Gwillimia was close to the section Theorhodon; （4） the genetic status of the genus Talauma was highly supported when its Asian section Blumiana was shifted to Magnolia; and （5） the genus Parakmeria formed a clade with the two genera Kmeria and Manglietiastrum; and they all had a close relationship with Magnolia subgenus Yulania and the genus Michelia. The position of flower buds, a major feature which had been previously employed to differentiate Michelieae and Magnolieae, turned out to be an unreliable character obscuring the distinction between the two tribes. The traditional circumscription of these two tribes should be emended. Magnolia and Michelia would become two well-defined genera when the subgenus Yulania was segregated from Magnolia to be treated as an independent genus.

关 键 词：木兰科 木兰属 mark基因 系统发育分析 

分 类 号：Q941[生物学—植物学] Q943