0023-6152

AA00697606

4621

Unrefereed

0023-6152

AA00697606

To evaluate fruit quality of triploid hybrid grapes obtained from reciprocal crosses between diploid 'Muscat Bailey A' and tetraploid 'Red Pearl', the flower clusters were immersted in a solution of GA3 (100mg/liter) at the full bloom stage and examined at the mature stage. Fruit set was observed in 55% of the 3x hybrits from 'Muscat Bailey A' × 'Red Pearl' and 68% of those from the reciprocal. GA3 treatment resulted in fruit set in all the hybrids. GA3-treated flower clusters of hybrids that showed no fruit set without GA3 treatment set fruits with the average of 67 berries per cluster. In almost all hybrids, GA3 treatment increased the number of berries set per cluster remarlably, especially in those set without GA3 treatment, average berry weight in GA3-treatment clusters ranged from 1 to 3g with the average of 1.9g In almost all hybrids that set fruits without GA3 treatment, GA3 treatment to the flower clusters increased berry weight irrespective of that in non-treaated flower clusters. In non-treated clusters, fertilized seeds were rarely detected in a few berries of hybrids from the reciprocal crosses (<0.3 per berry), whereas in GA3-treated clusters the rates of berries with seeds decreased less than 0.1%. In non-treated clusters, a large number of unfertilized small seeds with hard seed coat (<0.4 small seed per berry in average) were often observed among the hybrids from reciprocal decreased less than 0.1 seed per berry. About 95% of hybrids showed moderate and low extent of lignification of pedicles in GA3-treated clusters.