Abstract
Seedlings of Capsicum annuum (long fruited variety) were irradiated with acute gamma rays ( 60 Co) at cotyledonary, 4, 8 and 12-leaf stages of development. Seedlings were exposed to 1, 2, 3, 4, 5, 7·5 and 10 kR. Radio-tolerance of the plant at the different stages of its life history and of its shoot apex were determined. Cotyledonary stage was the most radiosensitive among the different irradiated stages. Sensitivity decreased with increasing age of the plant. Exposures of 3 kR and above were lethal for the seedling growth. In vegetative shoot apices the central zone was more radiosensitive than the flanks, T-2 more than T-1. Tunica 2 showed maximum sensitivity in floral apices of irradiated plants. Nuclear volume and percentages of cell deaths at different stages of development were important factors in determining radiosensitivity.
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