Abstract
A single foliar application of the ethylene (C 2H 4) releasing compound (2-chloroethyl)-methylbis(phenylmethoxy)silane (CGA 15281) to mature peach trees ( Prunus persica (L.) Batsch, cultivar ‘Redhaven’) was followed by increased evolution of C 2H 4 owing to degradation of the chemical. The highest rate of C 2H 4 evolution occurred 2 h after treatment, then declined rapidly approaching control values at 48–72 h. A marked increase in endogenous abscisic acid (ABA) noted 2 h after treatment was the earliest change detected in the leaves, while stomatal conductance and transpiration decreased within 4 h after treatment. Concurrent changes in the water potential were closely related to changes in stomatal conductance. Restrictions in assimilate production brought about by a synergistic action of ABA and C 2H 4 might be a significant factor in hastening abscission of leaves and fruits.
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