Vol. 72 No: 1

Title:
The Role of Ethylene in Apple Fruit Set

Authors:
M. RAHEMI, F.G. DENNIS JR, R.L. ANDERSEN, J.O. OZGA and R.X. XIA

pp: 67-76

Abstract:
Application of branch sprays of silver thiosulphate (STS) and of aminooxyacetic acid (AOA) did not affect fruit set or fruit size in three apple cultivars. In contrast, sprays of aminoethoxyvinyl glycine (AVG) (100 and 200 ppm) improved fruit set of open-pollinated flowers. Ethephon (40 to 100 ppm) did not affect fruit set significantly, yet at 100 ppm it eliminated the promotive effect of AVG. In two experiments, AVG tended to reduce ethylene production from flowers excised 1–10 d after treatment, but variability was high and the differences were not statistically significant. In an additional experiment, AVG inhibited ethylene production by all portions of dissected flowers (pedicels, receptacle, petals), with least effect on peduncles/pedicels. The peduncle/pedicels produced 5 to 25% of the total ethylene evolved by the flower cluster, the receptacle 20 to 50% and the petals approximately 50%.

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