Abstract
Abstract Abscisic acid4 (ABA), when applied as an immersion application at 200 and 400 ppm during cold storage or as a spray application at 100 and 200 ppm at 2 stages of growth, was evaluated as an inhibitor of bud break and shoot elongation in dormant plants of Rosa cv. Helen Traubel and Syringa cv. Monge. ABA applied on 2 consecutive days at 100 and 200 ppm inhibited bud break in Rosa, but did not inhibit shoot elongation. ABA did not inhibit terminal and lateral bud break or shoot elongation in Syringa. Immersion applications at several dates during cold storage inhibited bud break and shoot elongation in Rosa and inhibited terminal and lateral bud break in Syringa. The most effective concentration in inhibiting bud break was 400 ppm. Time of application significantly affected bud break in Rosa and lateral bud break in Syringa, but did not alter shoot elongation in either plant.
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