ISHS Acta Horticulturae 80: Symposium on Growth Regulators in Fruit Production
HORMONAL CONTROL OF FRUIT MATURATION AND RIPENING I. THE EFFECT OF GROWTH REGULATORS ON ETHYLENE PRODUCTION AND ACID PHOSPHATASE ACTIVITY IN APPLE FRUITS |
| Authors: | H. Plich, E.S. Hegazi |
| Abstract:
Ethylene production and activity of acid phosphatase were determined during pre- and postharvest ripening of McIntosh fruits treated with SADH 3 weeks after blooming and/or CEPA and NAA 2 weeks before harvest. In control fruits the sharp increase of ethylene content in seed cells was detected only after fruit detachment from the tree, although the picking was deferred for a week. In fruits treated with CEPA, and CEPA in combination with NAA and/or SADH two peaks of ethylene content were observed; one when the fruits were attached to the tree, a few days after spraying, and second, shortly after picking as with the controls, but the content of C2H4 was slightly lowered in fruits treated additionally with SADH. The activity of acid phosphatase in control fruits remained constant before and after harvest and only increased towards the end of the postharvest period. In fruits treated with CEPA + NAA or CEPA + NAA + SADH, maturity was hastened and an increase in acid phosphatase activity took place just before harvesting and continued during postharvest ripening. Rapid increase of ethylene content in fruits after picking occurred slightly in advance of a large decrease in fruit firmness, and of an increase in acid phosphatase activity. | |
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