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Abstract
Effects of growth regulators on parthenocarpic fruit development in muskmelon (Cucumis melo L.) were tested under field conditions. Parachlorophenoxyacetic acid (4-CPA) β-naphtoxyacetic acid (β-NOA), gibberellin (GA4+7), and 2-chloro-9-hydroxyfluorene-9-carboxylic acid (chlorflurenol) caused parthenocarpy, when applied directly to flowers at anthesis. Seed coat developed in all parthenocarpic fruits. A positive correlation (r = 0.80) was found between number of seeds, seed coats, and fruit weight. Fruit set was induced under field conditions without bees, by a single spray of 4-CPA or β-NOA or chlorflurenol applied to the entire plant.
Abstract
The effect of growth regulators indoleacetic acid (IAA), parachlorophenoxy-acetic acid (4-CPA), β-napthoxyacetic acid (β-NOA), gibberellin (GA3 and GA4+7) and benzyladenine (BA) applied directly to flowers at anthesis, caused parthenocarpy in cucumbers (Cucumis sativus L.), while (2 chloroethyl)phosphonic acid (ethephon) and abscisic acid (ABA) were ineffective. Only synthetic auxins and BA effectively induced parthenocarpy in treated whole plants. 4-CPA was the most effective treatment for induction of parthenocarpic fruits, as determined by number and shape. Application of GA to the entire plant caused increase in vegetative growth, but fruit development was inhibited even under conditions of natural pollination.