Naturally occurring hormones of mango and their role in growth and drop of the fruit.
Sant Ram
Author Affiliation: Department of Horticulture, G.B. Pant University of Agriculture and Technology, Pantnagar 263?145, Nainital, Uttar Pradesh, India.
: 400-411
Abstract : Fruits of the mango cultivars Dashehari, Chausa and Langra showed a sigmoidal growth pattern. Gibberellins were found only in the seed where their content increased rapidly during the early stages of development, then decreased as the seeds matured. Cytokinins occurred in both seed and pericarp. Their levels increased prior to rapid cell division and cell enlargement and a second increase occurred during cell enlargement. High levels of an ABA-like inhibitor were found during the first 21 days following pollination, corresponding to the period of slow growth and heavy fruit drop. As the growth rate increased the inhibitor levels were reduced and the levels of growth promoters increased. All endogenous growth regulators were at low levels during fruit maturation. Deficiency in cytokinins, gibberellins and auxins resulted in fruit drop but this could be overcome by applying sprays of exogenous growth regulators at fruit set.