[Inheritance of parthenocarpy in monoecious cucumber (Cucumis sativus L.) under different eco-environments]

By using the mixed major gene plus polygene inheritance model of quantitative traits, a joint analysis of four-generations obtained after cross between two monoecious inbred lines was made to study the inheritance of parthenocarpy in monoecious cucumber in Jiangning (Nanjing) and Changli (Hebei). The interactions between genotype and environment were detected, and the inheritance of parthenocarpy in the monoecious cucumber was fitted in E-1-1 model and controlled by two additive-dominant-epistatic major genes and additive-dominant polygene under different eco-environments. The F1 tendency and genetic parameters of the parthenocarpy were different, and the major gene heritability of F2 ranged from 42.1% to 97.5%, which was mainly due to the differences in sunlight intensity and air temperature during fruit-setting period at the two locations. It was suggested that the parents should be highly parthenocarpic in breeding program, and the characterization of parthenocarpy should be conducted under different eco-environments.