期 刊 ：植物遗传资源学报 2015年 16卷 1期
关键词：湖南；紫薇种质资源；遗传多样性；形态性状；聚类分析；
Keywords:Hunan, Lagerstroemia indica germplasm, Genetic diversity, Morphological characteristics, Clustering analysis,
摘 要 ：摘 要：对湖南省111份不同紫薇（Lagerstroemia indica）种质资源的17个形态性状多样性进行研究。结果表明，湖南省紫薇种质资源具有丰富的形态多样性，平均遗传多样性指数为0.707。总体上是数量性状形态多样性指数大于质量性状，其中2个质量性状（花色、瓣爪色）和5个数量性状（花径、着花数、花序长、花序宽、种子千粒重）变异明显，其多样性（Shannon’s）指数分别大于1.2和1.4。不同紫薇品种群种质资源遗传性状多样性差异明显，多样性指数由高到低顺序依次为：红薇品种群（L. indica Rubra Group）（H‘=0.838）、堇薇品种群（L. indica Amabilis Group）（H‘=0.823）、银薇品种群（L. indica Alba Group）（H‘=0.696）、矮生品种群（L. indica dwarf Group）（H‘=0.604）、复色品种群（L. indica Bicolor Group）（H‘=0.573）。通过主成分分析，前7个主成分的贡献率为67.70%，包括花序长、花序宽、着花数、花色数、花色、种子千粒重、瓣爪色、叶色、小枝四棱、花香、花径等11个形态性状指标，代表了紫薇种质各个性状的综合特征。基于形态性状，把111份紫薇种质聚类分析并划分为五大组群，其遗传聚类与张启翔、王献分别从形态观察和分子标记对紫薇品种分类原则与和标准一致，即将种源组成作为一级分类标准，株高作为二级分类标准，而将花色作为三级分类标准是完全相吻合的。
Abstract:Abstract: We studied the morphological diversity of 111 types of Lagerstroemia indica germplasm resources in Hunan by examining 17 morphological Characteristics. The results showed that, Lagerstroemia indica germplasm resources in Hunan were rich in morphological diversity, with mean diversity index (Shannon’s index, H‘) of 0.707. On the whole, the morphological diversity index of quantitative trait was greater than that of qualitative trait. We observed significant varieties in 2 qualitative Characteristics (color, claw color) and 5 quantitative Characteristics (the flower diameter, flower number, length and the width of inflorescence, 1000 seed weight), with H‘ being greater than 1.2 and 1.4, respectively. The degree of genetic diversity among different groups of Lagerstroemia indica varieties germplasm resources varied considerably. The groups of Lagerstroemia indica ranged in a diminishing order of H’ value from L. indica Rubra Group (H‘=0.838), L. indica Amabilis Group (H‘=0.823), L. indica Alba Group( H‘= 0.696), L. indica dwarf Group (H‘=0.604), to L. indica Bicolor Group (H‘=0.573). Based on principal component analysis, the contribution rate of the first 7 principal components was 67.70%, including the inflorescence length, inflorescence width, number of flowers, number of flower colors, flower color, 1000-seed weight, claw color, leaf color, branchlets four prism, potpourri, and flower diameter (11 morphological indices in total), which represent the crape myrtle Germplasm traits. Based on morphological traits, 111 copies of Lagerstroemia indica germplasm were analyzed in cluster and divided into five groups. The genetic clustering results are consistent with Zhang and Wang’s research in terms of morphological and molecular markers on the principle of classification of Lagerstroemia indica varieties and standards, i.e., using the source composition as the primary classification criteria, the plant height as the secondary, and the color as the third level classification criteria.