Endogenous cytokinins in relation to fruit development in mango (Mangifera indica L.) cv. Alphonso.
Murti G. S. R., Upreti K. K.
Author Affiliation: Plant Hormone Laboratory, Indian Institute of Horticultural Research, Hessaraghatta Lake, Bangalore 560 089, India.
Indian Journal of Plant Physiology 2 : 98-100
Abstract : Studies were carried out at Hessaraghatta, Bangalore, India, during flowering in 1991 and 1993. Fruit samples were collected at 15-day intervals from 30-135 days after fruit set in 1991, and from immediately after fruit set to 120 days after fruit set in 1993. Cytokinin activity increased in the pulp from 15 days after fruit set, and peaked at 45 days. Fruit growth was sigmoidal. The rise in cytokinin activity slightly preceded the increase in rate of fruit growth. Cytokinin levels were high during the early phase of rapid fruit growth. Three cytokinins, termed X2, X3 and X4, were predominant in the fruits. X3 and X4 were tentatively identified as zeatin riboside/dihydrozeatin riboside (ZR/DHZR) and zeatin/dihydrozeatin (Z/DHZ). The factor X2 could be a cytokinin glucoside.