Abstract
A high level of free abscisic acid (ABA) was detected in tuberose ( Polianthes tuberosa L.) bulbs during their dormant period. With the release of dormancy, the level decreased, suggesting that ABA is involved in the induction and maintenance of dormancy in bulbs. A gradual increase of bound ABA was observed during release of rest periods. Acidic and bound phenols vary with the dormant phases. The levels of indoleacetic acid (IAA) remained low during the early stages of bulb sprouting but increased rapidly thereafter. Changes in ABA, phenols and IAA levels are discussed in relation to the period of dormancy and immediately following its release in tuberose bulbs.
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