Abstract
Abstract Attempts were made to identify the stage of flower differentiation of subterminal buds under water stress conditions. Anatomical and morphological studies established that flower differentiation occurs during the stress period and that the generative bud formed does not undergo flower development until water is supplied. Gibberellic acid applied under normal irrigation conditions inhibited summer flower formation even when supplied after the first stages of flower bud differentiation, and stimulated vegetative growth of either 1 or 2 dormant axillary meristems. In contrast, 2-chloroethyltrimethylammoniumchloride induced flower formation when applied by the end of August to irrigated trees. Treatments with gibberellic acid under water stress conditions prevented flower formation but were inactive when applied after the renewal of irrigation and beginning of anthesis.
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