Abstract
Endogenous concentrations of indole-3-acetic acid, gibberellic acid, and abscisic acid were studied in intact fruitlets and their pedicels as well as fruitlets about to abscise and their pedicels, of Dusheri mango (Mangifera indica L.) at three developmental stages of the fruit, viz., pin head, pea, and marble stage, to assess their role in fruitlet abscission. A two-year study revealed that fruitlets about to abscise exhibited lower mean concentrations of indole-3-acetic acid (29.5, 30.6, and 26.7%), gibberellic acid (42.3, 54.0, and 42.8%), and higher concentrations of abscisic acid (30.4, 20.2, and 20.5%) compared to intact fruitlets at pin head, pea, and marble stage of fruit development, respectively. Likewise, the pedicels of fruitlets about to abscise showed lower mean concentrations of indole-3-acetic acid (7.3, 33.6, and 33.6%), gibberellic acid (50.3, 51.0, and 46.5%), and higher concentrations of abscisic acid (15.5, 31.9, and 29.2%) in comparison with the pedicels of intact fruits at three developmental stages, respectively.
