Functional aspects of Abscisic Acid Metabolism in Cotyledons of Phaseolus vulgaris L. Seedlings

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During the early stages of germination and vegetative development, cotyledons of intact bean (Phaseolus vulgaris L.) seedlings showed active ABA catabolism causing a low endogenous ABA content. At the end of the substrate mobilizing phase, when the cotyledons became senescent, a drastic increase of the endogenous ABA content linked with a decrease of the ABA catabolic activity was observed. This indicates that a close connection exists between senescence and endogenous ABA content and metabolism in bean cotyledons. Removal of the apical growth region induced in the cotyledons activation of the ABA catabolism and the endogenous ABA concentration decreased below the detection limit (0.1 ng/g fr wt) at the onset of the outgrowth of the axillary buds. From then, apical dominance was restored and the cotyledons returned to the senescent state, which was correlated with a drastic increase of their endogenous ABA content.
日本植物生理学会の論文