Genetic diversity of the fruit traits of F₁ persimmon progenies

In order to provide theoretical guidance for the genetic improvement of fruit quality and selection of superior persimmon clones by cross-breeding, the genetic variation of the important phenotypic and quality traits of the fruit of the F₁ persimmon progenies was studied.

The genetic diversity of 36 F₁ hybrid plants of ‘Fuyu’ × ‘Akagaki’ was analyzed by measuring 4 phenotypic indexes and 8 fruit quality indexes, and statistical methods such as person correlation analysis, principal component analysis and cluster analysis were used to analyze the correlation among the traits and the discretization among the individual plants of the F₁ persimmon.

(1) The variation coefficients of 12 traits of the F₁ progenies of persimmon hybridization ranged from 10.80%-165.97%, among which the variation coefficient of soluble tannins was 165.97%. The variation coefficient of the horizontal diameter of fruits was 10.80%. (2) Among the 66 pairs of correlations generated by the 12 traits, 9 correlation pairs reached an extremely significant level (P < 0.01) and 9 pairs reached a significant level (P < 0.05). The insoluble tannin content was significantly positively correlated with the total tannin content and it showed an extremely significantly negative correlation with the content of soluble proteins. There was a significantly positive correlation between the total tannin content and the total polyphenol content. (3) The 12 traits were reduced to 4 principal components by the principal component analysis, and the cumulative contribution rate was 73.42. Through the systematic clustering analysis, 36 individual plants of the F₁ generation were divided into 4 groups, including group I, Ⅱ, Ⅲ and Ⅳ. The clustering results fully reflected the characteristics of each group. (4) Through the data screen, the superior individuals of ZJ346, ZJ49 and ZJ40 were selected for different applications.

The genetic diversity of the 12 fruit traits of the F₁persimmon progenies is rich. Compared with the small variation of the phenotypic traits, the variation of important indicators of fruit intrinsic quality is more abundant.