新疆天山山脉地区疏花蔷薇天然居群表型多样性分析

 在新疆天山山脉地区选取疏花蔷薇（Rosa laxa Retz.）6个天然居群，对叶片、花序、果实和种子等14个表型性状进行了遗传多样性分析。结果表明：疏花蔷薇种内表型性状无论在居群间还是在居群内均表现出显著或极显著差异。表型性状居群间分化系数为41.84%，表明居群间和居群内多样性同样丰富。表型性状的平均变异系数为22.79%，离散程度较高。对表型性状进行的变异系数多重比较和主成分分析均显示，花序和种子相关性状的变异是造成疏花蔷薇表型变异的主要来源。利用居群间欧氏距离进行的UPGMA聚类分析结果进一步表明，疏花蔷薇6个天然居群可以分为3类，表型性状并没有严格依地理距离而聚类。

Phenotypic Diversity of Natural Populations of Rosa laxa Retz.in Tianshan Mountains of Xinjiang

Six natural populations of Rosa laxa Retz. in Tianshan mountains of Xinjiang were selected to analyze the phenotypic diversity based on 14 phenotypic traits from leaves，flowers，fruits and seeds. The results showed that there were significant differences in the phenotypic traits among populations and among individuals within populations. The mean phenotypic differentiation coefficient（V_ST）of the 13 morphological traits among populations was 41.84%，which indicating the comparatively abundant phenotypic diversity among or within populations. The average variation coefficient（CV）of phenotype traits was 22.79% showing the high variation of the phenotypic traits. Duncan’s test of CV and the principal component analysis of phenotypic traits both indicated that the traits on inflorescences and seeds were the main factors account for the phenotypic variations. According to the UPGMA cluster analysis，the populations of Rosa laxa in this study could be divided into three groups. These cluster results were not due to geographic distances.