Divisions of Fruit Crops, and Plant Physiology and Biochemistry, Indian Institute of Horticultural Research, Bangalore-560089
1 Present address: Deputy Director-General (Hort.), I.C.A.R., New Delhi
The cytokinin activity in the bleeding sap of ‘Anab-e-Shahi’ grape grown on six different rootstocks was monitored for two years. The cultivar ‘Gulabi’ as rootstock and ‘Anab-e-Shahi’ on its own roots exhibited high rate of sap flow and cytokinin activity per unit time of sap flow. The rootstock ‘Dogridge’ which had a good sap flow rate, recorded low cytokinin activity per unit quantity of sap. The rootstocks, ‘Teleki-5A’ and ‘1616’, showed poor sap flow and hence found to have low cytokinin activity. The parameters such as days to bud burst, number of fruitful canes, and yield per vine showed a significant positive correlation with the cytokinin activity of sap flowing per unit time. The predominant translocational forms of cytokinins tentatively identified from bleeding sap of ‘Anab-e-Shahi’ on its own roots are zeatin rlboside/dihydrozeatin riboside, and zeatin/dihydrozeatin.
