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The Use of Electrolytic Conductance to Assess Differential Sensitivity of French Prune Fruit to Applied Ethylene1


Fruiting branches of French prune (Prunus domestica L.) were exposed to ethylene or the ethylenegenerating (2-chloroethyl)phosphonic acid (ethephon) and subsequently 14C-uptake and ion leakage patterns of excised mesocarp disks were determined. Ion leakage was increased by these treatments, and the magnitudes of variances associated with ethephon-treated samples indicated differences in sensitivity among treated fruit. Under laboratory conditions electrolyte loss was associated with senescence of mesocarp tissue but was not a prerequisite of fruit abscission.