Abstract

Razaki which is standart table grape varieties were used in vegetation period of 2005 in this research. Samples were collected 15, 10, 8, 6, 4, 2 days before full blooming, in full blooming and 2, 4, 6, 8, 10, 15, 20, 25 days after full blooming. 75ppm GA3 was applied on flower and flower clusters, 10 days before full blooming (for promoting seedlessness) and 4 days after full blooming (for promoted largeness) as 2 times and by observing ovule developments; they were compare with untreated samples. Structures of outer and inner integuments in examined ovules started to show deformity 2 days after application. Generally, gaps occured between outer and inner integuments. While inner layer of outer integuments was disappearing 4 days after application, it elongated and went towards micropil aperture and ovules didn't create embryo sac. Embryo sac and it's organs were not observed in full blooming stage; besides, development stopped and shrinking started. Because GA3 stimulated cell division, 3-4 days after earliness in growth was observed than control. Besides, berries were longer than control. As a result, Razaki which was standart seeded varieties; first of GA3 application (10 days before full bloom) promoted seedlessness; second application of GA3 (4 days after full bloom) promoted largeness. Type of occured seedlessness was stimulative parthenocarphy.