Variation and Evaluation of Fruit Traits from Choerospondias axillaris Germplasm Resources

Abstract:

In order to analyze the variation pattern and genetic diversity of Choerospondias axillaris germplasms in typical distribution areas, fourteen fruit traits of 20 germplasms from 7 provinces were systematically analyzed and comprehensively evaluated. The results showed that there were variation and genetic diversity of 14 fruit traits in 20 germplasm resources. The variation coefficients of fruit traits except fruit shape index and edible rate were more than 10%, and the average genetic diversity index of fruit traits was 1.88. The correlation analysis showed that the single fruit weight of C. axillaris was positively correlated with the indexes of peel weight, kernel weight, pulp weight and transverse diameter, and the correlation coefficient was greater than 0.93. The 20 germplasms of C. axillaris were divided into 2 groups by cluster analysis, and the group II was further divided into 3 subgroups, and there were significant differences in fruit traits between 2 groups, and the biggest difference was single fruit weight. A comprehensive analysis model was established based on the principal component comprehensive scoring method. The 17#, 16#, 10#, 91# germplasms were selected, which had the characteristics of large fruit, high Vitamin C content, high total sugar content, and good comprehensive traits, and could be used as excellent germplasm resources for cultivation. Therefore, the fruit traits of C. axillaris germplasms had rich variation and genetic diversity, the selected 4 germplasm resources for fruit use had high breeding value and potential for development and utilization.

Key words:Choerospondias axillaris;Germplasm resource;Fruit trait;Mutation;Genetic diversity;Comprehensive evaluation