Comprehensive evaluation of germplasm resources of 100 cherry tomatoes based on different evaluation methods

Objective In order to explore the adaptability of cherry tomato germplasm resources, and evaluate the excellent cherry tomato breeding materials suitable for new varieties breeding in Yinchuan Plain area.

Method Totally 100 cherry tomato germplasm resources were collected as research objects, and the main phenotypic traits were determined. The adaptability was comprehensively evaluated by three different evaluation methods, which were widely recognized as multivariate statistical method, gray correlation analysis method and DTOPSIS method.

Result The coefficient of variation of the main phenotypic traits of 100 cherry tomatoes ranged from 17.78% to 306.46%, and there were significant or extremely significant correlations among most of the traits. The 26 phenotypic traits were integrated into 10 principal components, with a cumulative contribution rate of 71.901%. The comprehensive score was calculated based on the principal component, the weighted correlation degree was calculated by the grey correlation degree method, and the relative proximity degree was calculated by the DTPOSIS method. The ranking of various qualities under the three evaluation methods showed both uniformity and difference. A total of four materials were ranked in the top 10, namely, T55, T83, T42 and T87.

Conclusion Under the three evaluation methods, the comprehensive analysis shows that T55, T83, T42 and T87 are the best germplasm, and T55 is the most suitable germplasm material for cultivation in Yinchuan Plain, and can be used as an important basic material for breeding.