鹅观草属的系统发育分析  

A PHYLOGENETIC ANALYSIS OF ROEGNERIA(POACEAE)

作　　者：蔡联炳[1] 王玉金[1] 

机构地区：[1]中国科学院西北高原生物研究所,西宁810001

出　　处：《植物研究》2001年第4期554-560,共7页Bulletin of Botanical Research

基　　金：国家自然科学基金资助项目 (批准号 39870 0 90 )

摘　　要：根据分支系统学的原理和方法 ,对禾本科鹅观草属进行了系统发育分析。鹅观草属传统分类上的 1 8个系被确定为终端类群 ,来自形态学、解剖学、细胞学和孢粉学的 2 3个性状被选作建立矩阵的依据 ;雀麦族中的短柄草属作为外类群被用于外部性状的极性识别 ,过去分析过的性状资料被用于微观特征的极性判断 ;采用PAUP程序对矩阵进行运算 ,共获得 6个同等简约的谱系分支图 ,其中具最低f-比值的图被选作分支分析的基础。结果表明 ,分支图上显示的组、系划分与传统分类的基本一致 ,各类群间的演化关系与过去凭借单一证据所作的零散推断也基本吻合。所不同的是半颖组各支类群不是共祖起源 ,可能具有复杂的内部组成 ;在个别系间 ,分支图展现的类群位置与宏观分析的存在差异。On the Principles and methods of cladistics, the phylogenetic relationships in Roegneria of Poaceae were analysed in the present paper. Eighteen series of Roegneria in traditional taxonomy were recognized and regarded as the terminal taxa, and its twenty-three characters from morphology, anatomy, cytology and palynology were selected as the basis for constructing data matrix. Brachypodium of the tribe Bromeae was chosen as an outgroup, and used for determining polarities of external characters; the data of characters analysed in the past were used for judging the polarities of microcosmic characters. The data matrix was computed with the PAUP program. Six equally parsimonious cladograms were obtained and the one with the lowest f-value of 0.228 was selected as base for making cladistic analysis. The results of analysis show that the sections or series revealed by the cladogram basically agree with those in traditional taxonomy, and the phylogenetic relationships among the taxa are also consistent those inferred by a unilateral evidence in the past. In the cladogram, however, the taxa of Sect. Goulardia were not derived from a identical ancestor, and the section probably possesses a complex composition; the systematic positions of one or two series are different from those of the series analysed by the macroscopic characters.

关 键 词：鹅观草属 分支系统学 系统发育 

分 类 号：Q949.714.2[生物学—植物学]