G.B. Pant University of Agriculture and Technology, Pantnagar-263 145, U.P., India.
Key words: flowering, mangoes, abscisic acid, auxins, cytokinins, differentiation, flowers, fruiting, plant development, plant growth regulators, cultural methods, gibberellins, inhibitors, paclobutrazol, productivity, pruning, steroids, urea, growth, endogenous gro
Journal of Applied Horticulture, 1999, volume 1, issue 2, pages 84-88.
Abstract: Studies were conducted on alternate bearer mango cv. Dashehari. Dashehari produced a major vegetative flush in March-April followed by 2 minor flushes in June-July and September-October. The major vegetative flush fruited, whereas the other 2 minor flushes did not. Shoots which fruited rarely produced a new vegetative flush soon after crop harvest and also did not flower and fruit in the following season. To promote vigour and productivity, such shoots were forced to produce vegetative growth soon after crop harvest by pruning and application of 1-2% urea. Such treatments failed to induce flowering and fruiting. The concentrations of endogenous growth regulators were determined in shoots. Shoot-tips contained 3 auxins, 8 gibberellins, 11 cytokinins, 11 steroids and an ABA-like inhibitor. High concentrations of auxins, inhibitors, cytokinins and steroids were observed in shoot-tips just prior to or during the period of flower bud differentiation, whereas low concentrations of gibberellins were observed. Gibber
