Effect of Senescence on Levels of Free Abscisic Acid and Water Potentials in Cotyledons of Bean

摘要: Following imbibition and germination, levels of free abscisic acid (ABA) water potentials in senescing bean cotyledons (Phaseolus vulgaris L. `Kinghorn') showed peaks on days 4 6 after planting then declined as senescence intensified. Water potential displayed a final peak just prior to abscission which was not matched by corresponding rise acid, but this presumably reflected generalized loss synthetic capacity at that advanced stage senescence. The changing status the tissue may be attributable an imbalance between mobilization transport metabolites, with temporary stress apparent consequence asynchrony. These observations suggest changes level ABA were directly related advancing have been response marked tissue.