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作 者 ：宋 杰1,李世峰1,刘丽娜2,李树发1,解玮佳1,关文灵2*

期 刊 ：西北植物学报 2013年 2期 页码：272~279

关键词：云南含笑；天然居群；表型多样性；昆明；

Keywords:Michelia yunnanensis, natural population, phenotypic diversity, Kunming,

摘 要 ：为揭示云南含笑天然居群表型变异程度和变异规律,以云南昆明地区天然分布的云南含笑为研究对象,调查了6个居群180个单株的14个表型性状,采用巢式方差分析、变异系数、相关分析、Shannon-Weaver多样性指数分析和聚类分析等方法,分析了居群间和居群内表型多样性。结果表明:（1）云南含笑表型性状在居群间和居群内存在极其丰富的多样性,14个表型性状平均表型分化系数（24.38%）小于居群内变异（75.62%）,居群内变异是表型变异的主要来源；14个表型性状的变异系数（CV）在16.20%～60.11%之间,表明云南含笑居群内表型性状离散程度较高。（2）对云南含笑各居群的Shannon-Weaver指数分析表明,云南含笑各居群具有丰富的多样性,总体表型多样性指数为1.772。（3）利用居群间欧氏距离进行的UPGMA 聚类分析结果表明,云南含笑6个天然居群可以聚为3 类,而且表型性状并没有严格依地理距离而聚类。

Abstract:In order to reveal the variation degree and variation patterns of the phenotypic in Michelia yunnanensis,we investigated 14 phenotypic traits for 180 individuals in 6 natural populations of M.yunnanensis from Kunming City in Yunnan Province of China and used nested analysis,correlation analysis,variance analysis,Shannon-Weaver diversity index and cluster analysis to analyze results.The results showed that:(1)There were significant differences in the phenotypic variation among and within populations.Phenotypic differentiation coefficient (VST) among populations (24.38%),was less than that of within populations (75.62%).The variation within-populations comprised a majority of total phenotypic variation.Coefficient of variation (CV) varied from 16.20% to 60.11% showing the high variation of the phenotypic traits.(2)The Shannon-Weaver index analysis shows that there were rich diversity in M.yunnanensis various populations and the total mean diversity index was 1.772.(3)According to the UPGMA cluster analysis,the po-pulations of M.yunnanensis in this study could be divided into three groups.These cluster results were not due to geographic distances.Utilizing of variation within and among populations is important significance for genetic improvement of M.yunnanensis.

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