ISHS Acta Horticulturae 175: Symposium on Physiology of Productivity of Subtropical and Tropical Tree Fruits
STUDIES OF PLANT GROWTH REGULATOR EFFECTS ON TROPICAL AND SUBTROPICAL TREE FRUITS OF THAILAND |
| Author: | S. Subhadrabandhu |
| Abstract:
The use of growth regulators has been investigated on some tropical and subtropical fruits of Thailand. NAA and IBA have been found useful for the promotion of rooting of stem cuttings of tangerine and mango. Daminozide was found to increase the percentage of hemaphrodite flowers in mango while maleic hydrazide had the opposite effect. With litchi, ethephon applied in December to the early variety Hong Huay at 100 ppm increased flowering, while there was no effect on the later variety Opia even at higher concentrations. Papaya showed no change in sex expression with sprays of GA3 or ethephon, applied 21 days after germination. For longan, sex ratios of male to hemaphrodite flowers were changed with growth regulator sprays applied one month before appearance of the infloresence. NAA, CCC and ethephon all reduced the number of male flowers. When tangerines were sprayed with 2,4D and gibberellic acid at full bloom fruit set was increased, while subsequent fruit drop was unaffected. The data presented suggests that it is likely to be fruitful to extend such studies to tropical and sub-tropical fruits elsewhere in the world. | |
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