Effects of indole-3-acetic acid, gibberellic acid, and abscisic acid on abscission of mango fruitlets.
Bains K. S., Bajwa G. S., Zora Singh
Author Affiliation: Department of Horticulture, Punjab Agricultural University, Ludhiana 141 004, India.
Tropical Agriculture 76 : 88-92
Abstract : Endogenous concentrations of IAA, 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) at 3 fruit developmental stages (pin head, pea, and marble stage) to assess their role in fruitlet abscission. A 2-year study revealed that fruitlets about to abscise exhibited lower mean concentrations of IAA (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%) than intact fruitlets at pin head, pea, and marble stages of fruit development, respectively. Likewise, the pedicels of fruitlets about to abscise showed lower mean concentrations of IAA (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 3 developmental stages, respectively.