The leaf areas in the cane limited by 5 leaves, 15 leaves, 25 leaves for two bunches was studied on total leaf area, fruit dry weight, reducing sugar, tartaric acid, anthocyanin, and invertase activity with the foliar application of 1 and 10% sucrose and 25 and 50 ppm of 6-benzyladenine. The results obtained are as follows:
1. Total leaf area was significantly increased by the increased number of leaves per cane, while an average leaf was reduced.
2. As the leaf number increased in the cane, the contents of reducing sugar, anthocyanin, and berry weight increased but tartaric acid decreased.
3. However 35 leaves retained in the cane with two bunches increased anthocyanin, but not reducing sugar, as compared with 25 leaves.
4. The single foliar application of sucrose and benzyladenine increased reducing sugar.
5. The mixture solution of two compound increased reducing sugar content, but the only 1% sucrose foliar application with 50 ppm of 6-benzyladenine decreased reducing sugar.
6. Invertase activity in berries showed rapid increase from July 24 to August 8, and then kept its elevated level.
7. Any significant change of invertase activity due to sucrose or benzyladenine treatment was not noticed.
|