ISHS Acta Horticulturae 329: VII International Symposium on Plant Growth Regulators in Fruit Production
BERRY DROP AND FRUIT REMOVAL FORCES AS RELATED WITH GA3 APPLICATIONS IN TABLE GRAPES |
| Authors: | J. Retamales, T. Cooper |
| Abstract:
Increasing gibberellic acid (GA3) applications in seedless grapes is known to be related to the more severe occurrence of berry drop in postharvest. It has been assumed that this occurs via a reduction in the attachment of the berries. A methodological approach was developed to measure fruit removal force (FRF), in Chilean Thompson Seedless grapes treated with different GA3 levels (30, 110 and 250 ppm GA3). Contrarily to the assumed notion, in spite of increased actual berry drop, larger FRF occurred as GA3 levels increased, resulting in a greater detachment resistance. Further, a marked reduction in pedicel flexibility was caused by GA3 and this is postulated to be involved in the berry abscission mechanism under these conditions. | |
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