ISHS Acta Horticulturae 525: International Conference on Integrated Fruit Production
HORMONAL PHYSIOLOGY OF MANGO MALFORMATION-AN OVERVIEW |
| Author: | Z. Singh |
| Abstract:
Mango malformation is a serious threat to the mango (Mangifera indica L.) industry in various countries of the world. Two types of mango malformation occur, i.e. vegetative and floral. Etiology and control of mango malformation are yet not well understood. Fungi, mites, viruses, physiological factors, malformins and mangiferins are its reported causes. The present review will focus on the role of endogenous phytohormones in the causation of mango malformation and their in vivo regulation to minimise floral malformation. Recent studies revealed that malformin-like substance(s) are involved in the causation of mango malformation, with malformin stimulated ethylene production. Floral malformation has also been associated with higher levels of abscisic acid, gibberellic acid and zeatin but lower levels of indole-3-acetic acid. Vegetative malformation is associated with malformins-stimulated ethylene production, abscisic acid, zeatin and decreased levels of indole-3-acetic acid and gibberellic acid. In conclusion, malformin-like substances are somehow involved in the causation of malformation, with malformin-stimulated ethylene production (Singh and Dhillon, 1988a, 1990a) causing a hormonal imbalance and consequently disturbed metabolism inducing malformation. Recent experiments have revealed that a single foliar spray application of cobalt sulphate (1000ppm), prior to flower bud differentiation and pruning of malformed parts, substantially reduced the incidence of floral malformation. | |
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