Analysis of agronomic traits in tomato inbred lines

The genetic diversity and genetic relationship of 9 agronomic traits among 46 tomato inbred lines were comprehensively examined by variation evaluation,genetic correlation analysis,principal component analysis and cluster analysis.The results showed that the trait of weight per fruit displayed the highest coefficient variation(CV) of 36.8%,while the fruit hardness had the lowest CV of 12.6%.The correlation analysis indicated that complex correlations exist among different traits.The results of correlation and path analysis showed that the total yield per plant was closely related to the number of ventricles,transverse diameter of fruit,longitudinal diameter of fruit,weight per fruit and fruit set rate.Principal component analysis showed that the first four principal components accounted for over 84.4% of genetic diversity,which contained most information of all indicators.The 46 tomato inbred lines were divided into 3 groups at the 0.16 European distance,foreign resources were clustered compactly into 1 sub-group and 2 sub-group of the first group; and only 1 Chinese wild tomato was clustered in the second group.The results clearly defined the phenotypic features of tomato inbred lines,which provided useful information for breeders to accelerate breeding process of new cultivars.