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- Author or Editor: C.L. Patterson x
- Journal of the American Society for Horticultural Science x
Abstract
Ethylene production of 470 ‘Hi-Early Red Delicious’ apples harvested from primary, secondary, tertiary, etc., branches of 4 uniform trees of Malus domestica Borkh. was measured to determine pattern of ripening in relation to fruit position on the tree. Considerable variation was noted between and within branches. Some fruits showed surprisingly high ethylene (about 200 ppm at 155 days and up to 500 ppm at 160 days after full bloom) while others measured less than 5 ppm. Regression analysis revealed a linear trend between primary branches from base to apex of the tree. Delayed ethylene production of fruits below terminal shoots suggests ripening regulators in shoot tissue are interacting to delay ethylene synthesis.