Comparative Study on Physiological and Biochemical Properties of Male Sterile Lines and Their Maintainers in Eggplant

The eggplant male sterile line 05-506 and its maintainer 05-507 which were developed through interspecific hybridization of S.melongena L.with S.integrifolium,were employed to analyze the content of hormones,chlorophyll,free amino acids,soluble sugar and photosynthetic characteristics in eggplant leaves.Results showed that the content of IAA and GA3 in the male sterile line was lower than those in its maintainer in seedling stage,but the content of ZR was higher than that in its maintainer.The ratio of ABA/(IAA+ZR+GA3) in the male sterile line was 1.3 times of the maintainer.In seedling stage,the chlorophyll content of the maintainer line was higher than that of the male sterile line.In blooming stage,the male sterile line was observed to have a similar chlorophyll content with its maintainer.In fruiting stage,the chlorophyll content of maintainer line was lower compared with the male sterile line.The variation of net photosynthesis rate(Pn) was found similar to the content of soluble sugar and free amino acid.The ratio of soluble sugar content to free amino acid in eggplant was quite low in seedling stage,however,it increased in blooming stage and decreased in fruiting stage.The decreased ratio of male sterile line was lower than maintainer line in fruiting stage.The curves of diurnal variation of Pn in leaves of the male sterile line and their maintainer showed two peaks,with a phenomenon of noon nap.Pn values of seedling stage〈blooming stage〈fruiting stage in different stages were ranked as,but seedling stage〈fruiting stage blooming stage〈blooming stage for the maintainer.The research also demonstrated that the light saturation point of the male sterile line was always higher than that of the maintainer line both in vegetative growth and in reproductive growth stages,the light compensation point of the male sterile line was always higher than that of the maintainer line both in seedling stage and the blooming stage,but lower compared with the maintainer in fruiting stage.