【作者】 宣晶；

【导师】 张志翔；

【作者基本信息】 北京林业大学 ， 野生动植物保护与利用， 2009， 硕士

【摘要】 6东业假卫矛属(Microtropis Wall．ex Meissn．)植物的分化及起源中心是在中国云南省滇东南大围山区。云南省也是假卫矛属(Microtropis Wall．ex Meissn．)植物分布种类最多的地区之一。云南省屏边自治县的大围山区分布的种类中不仅包括假卫矛属(Microtropis Wall．ex Meissn．)植物进化过程中较为原始的类群，还存在一些可能是进化旁支的类群。7广义日本假卫矛复合体分布范围由云贵高原沿东南沿海直至台湾岛、琉球群岛直至日本列岛。其形态特征成连续变化状态，某些类群存在一些稳定的性状可作为区分，但很难找出一个合适的分类性状进行分类学处理。从分子系统树的结果与分析来看，这一复合体起源可能较为复杂，并且涵盖了一些分类性状较为稳定的近缘类群，这使得对这一复合体的分类学研究更加困难。更多还原

【Abstract】 In this paper,20 populations from 17 species of the Microtropis plants collected from the tropical and subtropical areas of China were investigated using a molecular phylogenic study.Based on the Sequences informations of trnL intron and trnL-trnF spacer,rpl32-trnL(UAG) regions from cpDNA,and ITS regions form nrDNA form the research materials and GenBank,the molecular phylograms of Microtropis were constructed with different methods.Through an analysis on the phylograms constructed with different menthods based on both cpDNA and nrDNA combined with the achievement of Taxonomic study,the phylogeny of genus Microtropis was discussed.The main conclusions are as the follows:1 Microtropis Wall.ex Meissn.is a monophyletic group.1 Microtropis wui Y Y.M.Shui et W.H.Chen with the Tropical Rain Forest characters is the ancient group of Microtropis Wall.ex Meissn.The characters may be the ancient characters of Microtropis.The Genus Microtropis may have an origin of tropical.Though later than Genus Euonymus Linn.on the divergence time,Microtropis is still considered as an ancient taxonomic group.2 Genus Quetzalia was homologous to Microtropis,and was divergened from the anciet group of Microtropis,which refers to reallocate the Genus Quetzalia to the Genus Microtropis.The floristic geographical element of Microtropis should be considered to be Tropical Asia-Tropical America disjunction.However,the Microtropis species in America was supported to be an indepanded evolution branch for a geographic isolationoccur in the early geochron.3 The Hot Spots of Microtropis were appeared both in South Yunnan of China and Borneo Island of Malay Archipelago.The india-eurasia collision is supposed to be the cause of hot spots. The origin centre of Microtropis is supposed to be on the Indo-China Peninsula.4 The Microtropis can be treated to be two Taxonomic Groups based on the form of Inflorescence,one of which is the group of dichasium,and the other is the group of racemiform cyme.The form of fasciculate cyme includes both racemiform cyme type and dichasium type.The phylogeny status of fasciculate cyme is suggest to have a further study.5 The origin and divergence center of East-Asia Microtropis is Daweishan Mountain in Southeast Yunnan.It is supposed that,there lived both some of the speices of evolutionary offset and some ancient speices in Daweishan Mountain of Pingbian.6 The complex of Microtropis japonica s.1.was mainly located from Yunnan-Guizhou Plateau to Japan archipelago.There are continuous variations in M.japonica s.l..Though some species can be distinguished with some stable characters,the complex is hard to search out a proper taxonomic character to confirm the Taxonomic status of M.japonica s.l..The result of molecular phylogenic study shows a complex origin of M.japonica s.l.,which refers to comprise some close relative species.The phylogeny and taxonomy study on this complex seemed to be more difficult.更多还原