NATURALLY OCCURRING HORMONES OF MANGO AND THEIR ROLE IN GROWTH AND DROP OF THE FRUIT

S. Ram
The mango cvs. Dashehari, Langra and Chausa are self-incompatable and require cross pollinations for fruiting. The unpollinated ovaries may set fruits grow only for 2–3 weeks. The fruits of fertilized ovaries showed sigmoid growth in mango cultivars. The endogenous auxin level increased and decreased with the change of fruit growth. The gibberellin was pressent only in seed and pericarp contains gibberellins in traces. The gibberellin content in seed increased rapidly during early seed growth and decreased as seed completes growth Cytokinins were present both in pericarp and seed. Cytokinin concentrations increased in the fruit at two periods in the single period of its rapid growth. The first rapid increase in cytokinin concentration preceded the period of rapid cell division and cell enlargement, while the second increase coincided with the period of rapid cell enlargement. The level of ABA-like inhibitor was at high level during the first 21 days preceding pollination, corresponding with the period of slow rate of growth in fruit and heavy fruit drop. During the rapid period of growth, the level of inhibitors decreased and promoters increased. The levels of both growth promoters and inhibitors were low in the fruit during maturation and slow rate of fruit growth. Thus, all the growth promoters play their important roles in the growth of the fruit. Deficiency of auxins, gibberellins and cytokinins coupled with high level of inhibitor appear to cause fruit drop in mango.
Ram, S. (1992). NATURALLY OCCURRING HORMONES OF MANGO AND THEIR ROLE IN GROWTH AND DROP OF THE FRUIT. Acta Hortic. 321, 400-411
DOI: 10.17660/ActaHortic.1992.321.43
https://doi.org/10.17660/ActaHortic.1992.321.43

Acta Horticulturae