To improve the fruit quality in triploid grapes, the mechanism underlying formation of unfertilized small seeds with hard seed coat was investigated in berries of a large number of triploid hybrids obtained from reciprocal crosses between diploid 'Muscat Bailey A' and tetraploid 'Red Pearl'. In each triploid hybrid plant, ten flower clusters trimmed so that they have about 200 flowers each were open-pollinated, and another ten open-pollinated flower clusters trimmed similarly were immersed in a solution of GA3 (100 mg/l) at the full bloom stage. Triploid hybrid plants that produced unfertilized small seeds were 8/18 plants for open-pollinated clusters and 21/68 plants for GA 3-treated clusters. The rate of unfertilized small seeds was different in different triploid hybrids, and the rates in each triploid plant showed small variation between two or three years examined. In GA 3-treated clusters, the rate of small hard seeds in each hybrid was dramatically decreased. These results indicated that the extent of unfertilized small seed formation is a triploid-plant-specific character and that the formation is highly suppressed by immersion treatment of the flower clusters with high concentration of GA3 solution.
|Number of pages
|Journal of the Faculty of Agriculture, Kyushu University
|Published - Oct 2005
All Science Journal Classification (ASJC) codes
- Agronomy and Crop Science