ISHS Acta Horticulturae 727: X International Symposium on Plant Bioregulators in Fruit Production
EFFECT OF APPLICATION OF GIBBERELLINS IN COMBINATION WITH FORCHLORFENURON (CPPU) ON INDUCTION OF SEEDLESS FRUIT SET AND GROWTH IN TRIPLOID LOQUAT |
| Authors: | S. Yahata, M. Miwa, H. Ohara, K. Ohkawa, H. Matsui |
| Keywords: | fruit development, fruit quality, fruit size, parthenocarpy, seedless fruit production |
| Abstract:
This experiment was conducted to induce seedless fruit set and growth in the triploid loquat by applying GA3, GA4, GA7 or GA4+7 at 200 mg L-1 in combination with forchlorfenuron (CPPU) at 20 mg L-1 to flowers and fruitlets two times, at bloom and 57 days after bloom. The flowers were not emasculated. Treatment solutions of 100 µL were applied to each flower and fruitlet. Untreated control fruit gradually abscised and final fruit set was 0%. When GA3, GA4, GA7 or GA4+7 in combination with CPPU were applied, fruit sets at harvest were about 61%, 40%, 74% and 56%, respectively. The harvested fruits were all seedless. GA3+CPPU produced the largest fruits (51.4 g), whereas GA4+CPPU produced the smallest (23.3 g). Brix and fruit flesh firmness did not show marked differences among GAs treatments. Titratable acidity in GA3+CPPU treated fruits was the lowest and in GA4+CPPU treated fruits was the highest. These results suggest that GA3+CPPU is more effective than other combinations of GA+CPPU for seedless fruit production in the triploid loquat without decreasing the fruit quality. | |
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