披碱草属穗型下垂类种质的形态学鉴定及其聚类分析  

Morphological Identification and Cluster Analysis of Spike-drooping Germplasm of Elymus

作　　者：卢红双[1] 徐柱[1] 马玉宝[1] 李临杭[1] 

机构地区：[1]中国农业科学院草原研究所,内蒙古呼和浩特010010

出　　处：《云南农业大学学报》2008年第2期150-157,161,共9页Journal of Yunnan Agricultural University

基　　金：国家重点基础研究发展"973"计划资助(2007CB106806)

摘　　要：对采自8个不同地区的49份花序下垂的披碱草属种质材料进行了形态学鉴定和分类。利用25个形态学特征对其进行了系统聚类和主成分分析。结果表明,这些种质材料属于老芒麦、垂穗披碱草和短芒披碱草3个种,而且在同一种内不同居群间具有较大的形态变异,根据这些形态变异,可将老芒麦分为典型老芒麦、粗壮多花老芒麦、分枝型老芒麦和密穗老芒麦4个类群(生态型);垂穗披碱草分为典型垂穗披碱草、高大多小穗垂穗披碱草和分枝型垂穗披碱草3个类群(生态型)。In this paper, 49 spike-drooping Elymus germaplasm samples collected from 8 different regions were morphologically identified and classified, and 25 morphological characteristics were also studied by cluster analysis and principal components analysis. The result indicated that these germplasm samples belonged to Elymus sibiricus, Elymus nutans and Elymus breviaristatus, respectively, and there were obvious variations among different populations of the same species. Therefore, E. sibiricus was divided into 4 different groups （ ecotypes ） ： typical E. sibiricus, strong multi-flower E. sibiricus , spike-ramosed E. sibiricus and spikelet-densing E. sibiricus ; E. nutans was divided into 3 different groups （ ecotypes ）： typical E. nutans, high multi-spikelet E. nutans and spike-ramosed E. sibiricus base on their morphological variations.

关 键 词：披碱草属 分类 鉴定 聚类分析 生态型 

分 类 号：S543.901[农业科学—作物学]