基于表型的樱桃番茄种质遗传多样性分析

Genetic Diversity Analysis of Cherry Tomato Germplasms Based on Phenotypic Traits

为研究樱桃番茄种质的遗传多样性,科学评价种质,以21份自交系为材料,对其12个表型性状进行遗传变异、主成分和聚类分析。结果表明:各性状的变异系数为14.97%~216.48%,Shannon多样性指数为0.66~1.34。选取累积贡献率为76.619%的前4个主成分,所包含的9个表型性状是种质评价的主要指标,5份材料综合表现优良(F>0.8)。进一步系统聚类,在欧氏距离8~11之间将供试种质分为四类,分别包含6、10、4和1份材料,可用于不同类型品种的选育。21份樱桃番茄种质具有较丰富的遗传多样性,为相关资源的利用及品种选育提供了参考。

In order to study the genetic diversity of cherry tomatoes and evaluate the germplasms scientifically, twelve phenotypic characters were analyzed by genetic variation, principal component and cluster analysis in 21 inbred lines.The results showed that the variation coefficient ranged from 14.97% to 216.48%, and the diversity indices ranged from 0.66 to 1.34 in different traits. Considering the first four principal components which had a cumulative contribution rate of 76.619%, five germplasms had excellent comprehensive performance(F>0.8) with 9 main phenotypic indices for germplasm evaluation. By further systematic cluster analysis, the germplasms were classified into 4 clusters between 8 and 11 in euclidean distance, including 6, 10, 4 and 1 germplasms respectively, which could be used to breed different varieties. In brief, 21 cherry tomato germplasms had rich genetic diversity, which would provide a reference for the resource utilization and variety breeding.