Abstract
Abstract Lycopersicon esculentum Mill. X Lycopersicon esculentum (E X E) and interspecific Lycopersicon esculentum × Lycopersicon peruvianum (L.) Mill. (E × P) ovules were studied to determine the sequence of events leading to embryo and endosperm deterioration in E × P ovules. At 7 days, the single-celled zygote and multicellular endosperm stage, the E × P ovule showed no signs of abnormality. Endosperm deterioration was the first indication of anatomical abnormality. The endosperm had disintegrated totally by 10 days after pollination. The ExP embryo did not follow normal stages of embryo development but divided randomly, and at 17 days filled the embryo sac with an undifferentiated mass of cells. Deterioration of both the E x P embryo and the cells of the proliferated endothelium was complete by 24 days. The embryo sac cavity size of 14-day E × P ovules and the weight of 13-day ExP ovules also indicated that endosperm and embryo breakdown began in this interspecific cross earlier than the 30- to 40-day age reported by other researchers.
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