Analysis of Leaf Phenotypic Variation and Evaluation of Elite Individual Plant in F₁ Progeny of Eucommia ulmoides

The genetic diversity of 17 leaf phenotype in F₁ progenies from the cross of 'Huazhong No.8' and 'Huazhong No.12' were analyzed by means of discrete description, correlation analysis, t-test and heterosis. And the F₁ offspring with stable leaf phenotypic traits were screened by membership function analysis. The results showed that the variation of leaf phenotypes in F₁ generation of Eucommia ulmoides from 2017 to 2019 ranged from 1.55% to 48.20%, and the variation coefficient of leaf active components was lower than leaf morphology, while leaf morphology had more variation. There was a very significant positive correlation between the 2 phenotypes of aucubin, genipinic acid, cypermethrin and chlorogenic acid in at least 1 year. Among the remaining 12 leaf morphological characters, there was a very significant negative correlation among leaf area, leaf shape index and leaf width, and an extremely significant positive correlation among leaf length, leaf width and leaf shape index. The correlation among leaf red component, blue component, green component and leaf chlorophyll reference value reached extremely significant or significant level. The chlorophyll reference value, leaf red component and green component was extremely significant negative correlation. Some phenotypes of F₁ generation of E. ulmoides leaf were mutually restricted, and some phenotypes have relatively stable relationship, but the correlation were complicated. Twenty-nine plants with stable leaf phenotypes were obtained, among which the most stable plants were H8−8, H8−63 and H8−66.