单子叶植物科级分类阶元形态性状分支分析  

A Cladistic Analysis of Monocotyledons at the Family Level Based on Morphological Data

作　　者：李晓贤[1] 周浙昆[1] 

机构地区：[1]中国科学院昆明植物研究所生物多样性与生物地理学重点实验室,云南昆明650204

出　　处：《云南植物研究》2006年第3期241-249,共9页Acta Botanica Yunnanica

基　　金：国家自然科学基金(30370096)项目资助

摘　　要：基于93个形态形状,采用13个被子植物基部类群做为外类群,对49个单子叶植物科级分类阶元进行了分支系统学分析。经过简约性分析,得到了1684棵同等最大简约分支树。严格一致树的分支结构图表明1)古草本类植物和单子叶植物是姐妹群关系;2)具有网状脉的类群,薯蓣科,菝葜科,百部科是单子叶植物的最基部类群。由于性状状态间存在着较多的平行和逆转进化,这在一定程度上影响了系统发育重建的准确性;所选择的性状状态之间的演化很可能是平行的、多次的或者是特化的状态,因此这样复杂的演化关系的探索关键在于找到一些能确切反映其系统演化关系的形态性状。目前很难通过简约化的形态分支分析来解开整个单子叶植物的起源和演化之谜。为了避开对系统学分析造成干扰的误导性状,形态数据结合DNA序列分析很可能是必需的。Based on 93 morphological characters, sixty-two famlies including 49 representatives of monocotyledons and 13 other angiosperms samples were cladistically analyzed using maximum parsimony method. The results supported that paleoherbs and monocotyledons are a sister groups. The basic taxa of monocotyledons are composed by reticulate-venation groups which were Dioscoreaceae, Smilaceae and Stemonaceae. The resolution and support of the topology were generally low which implied that the non-homoplasy character were relatively in high degree, so that we should be carefully to explain the results. We assumed that the key problem for the phylogenetic studies on these species was to find the exact characters that may imply the real evolutionary history. In order to avoid the inference of misleading characters for phylogenetic analysis, it is protably necessary to combine the morphological data and DNA sequence data.

关 键 词：单子叶植物 科级分类阶元 形态性状 分支分析 

分 类 号：Q949.71[生物学—植物学]