ISHS Acta Horticulturae 120: Symposium on Growth Regulators in Fruit Production
ON THE ROLE OF ETHYLENE IN APPLE FRUIT SET |
| Authors: | M. Rahemi, F.G. Dennis Jr |
| Abstract:
To determine if ethylene production by apple flowers limits fruit set, aqueous sprays of aminoethoxyvinylglycine (AVG), an inhibitor of ethylene synthesis, and of (2-chloroethyl) phosphonic acid (ethephon), an ethylene-generating compound, were applied to branch units of trees of 3 apple cultivars (McIntosh, Red Prince Delicious, and Golden Delicious) at full bloom. Fruit set was recorded at intervals from 3 weeks after full bloom until harvest, and samples of flower and fruit clusters were removed at intervals of 1 to 10 days after treatment for measurement of ethylene evolution. The clusters were held with their bases in water in sealed containers in the dark at 21° C, and CO2 was absorbed by placing a filter paper wick moistened with 40% KOH in each container. The jars were ventilated after 4 hr, and ethylene production was measured during the subsequent 4 hr by gas chromatographic analysis of 1 m1 samples of air from the chambers. | |
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