Evaluation and Genetic Diversity of Tomato Varieties Based on Phenotypic Traits

To evaluate 48 tomato variety resources collected from domestic and abroad,phenotypic traits were investigated and measured.The data were analyzed by multivariate statistical analysis to study the genetic diversity.The results showed that the variation of different traits was between 14.03% and 81.25%,with the average value of 40.79%.Correlation analysis found that agronomic traits of plants and quality traits of fruit were intrinsically linked.The 15 components were reduced to five by principal component analysis.They were flowers and fruits factor,reproductive period factor,nutrition factor,plants morphology factor and fruit shape factor respectively.48 tomato materials were divided into five groups by cluster analysis.Classification of 70.8% varieties were consistent with the results of discriminant analysis.The results clearly defined the phenotypic specificity and genetic diversity of tomato varieties,which filtered some specific variety resources to provide the basis for further use and improvement of them.