Abstract: Basing on the observation on and comparison between the development of normal and abortive embryos. The author has paying attention to different cases of supplying nutrient to the embryo and accuinulating nutritive substances in embryo, the present paper deals with problem about embryo's abortion in Niger seeds. The normal development of embryo after fertilization essentially depends on the sufficient supply of carbohydrates from their surrounding tissues, while the abortion of embryo is related to the short supply of carbohydrates.

Key words: accumulation, moilization, starch, abortion