Abstract
Abstract Physiological parameters of abscission at the zone between the pedicel and fruit of the sour (Prunus cerasus L. ‘Montmorency’) and sweet (Prunus avium L. ‘Windsor’) cherry were investigated using fruit explants. 3-Indoleacetic acid, 2-(chloroethyl)phosphonic acid (ethephon), gibberellin A3, and abscisic acid hastened abscission (during Stage III) in sour cherry, while only ethephon enhanced abscission in the sweet cherry. Cycloheximide blocked abscission in both sour and sweet cherry and negated the effect of ethephon. Explants prepared from fruits during various stages of development exhibited a differential response to ethylene. Abscission in the sour cherry was enhanced by increasing temperature and was greater in dark than in light, while both high CO2 and low O2 levels delayed abscission.
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