THE TRI-FACTOR HYPOTHESIS OF FLOWERING IN MANGO

Abstract

While identity of the flowering factor(s) continues to be a mystery, erratic flowering also continues to be a serious limitation in mango production. Timing of flowering is as important as its extent and regularity from a commercial point of view. Concepts have been developed to attribute flowering to environmental, genetic, hormonal and nutritional factors. The tri-factor hormonal theory implicates a flower promoter, a flower inhibitor and bud activity during the floral cycle. What does this theory mean? What information do we have on the flower promoter and the flower inhibitor? Can we explain common observations based on this hypothesis? Taking the hormonal theory as a central theory, is it possible to link the theories together? A wide range of natural and imposed stress conditions and horticultural practices are reported to induce flowering. Some treatments are reliable in some situations but not in others. Can we explain these practices, the anomalies associated with them and other orchard situations with a holistic approach? The review addresses these questions and some of the practical issues in the light of the theoretical background of the 'Tri-factor hypothesis'. The review aims at discussing various concepts of flowering in mango and at developing strategies for flower-manipulation based on our current understanding of factors affecting flowering in mango.