Abstract
The tea plant is suitable material for studying -the radiation effects on the development of the leaf-and flower buds because each bud has three primo-rdia, inner one of which would develop to the leaf bud, the others to the flower buds, if possible. Whether these primordia would develop to the leaf bud or the flower buds depends upon the inte-lrnal and external conditions of the plants. Based on such a view, 2 to 7 year-old plants of tea varieties were irradiated chronically with gam-ma rays (60Co) at the two stages of development. The levels of exposure were 1O, 12.5, 25, 50, 100 and 200R/day.
