Abstract:

Asynchronous flowering period in different species of Cucurbita was overcome by the means of adjusting sowing time. The experiment of interspecific hybridization was done between 12 materials of three mainly cultivated species (C. pepo, C. moschata and C. maxima) and fig-leaf gourd (C. ficifolia.). It was no fruit when the fig-leaf gourd act as female parent，and it was fruiting when the other three mainly cultivated species did. There were no seeds in the fruits when C. pepo×C. ficifolia and C. maxima×C. ficifolia. 18 F1 plants of C. moschata×C. ficifolia were obtained. The stamens were degenerate in the plants of the interspecific hybrids F1. It was fruiting but no seeds when the interspecific hybrids F1 as female parent and backcrossing using C. moschata or the C. ficifolia as male parent. The plant morphology of F1 of C. moschata×C. ficifolia was intermediate type of parents and had a tendency to the male parent. Disease resistance and insect resistance of the F1 were worse than C. ficifolia of male parent and approached C. moschata of female parent.