Indian Journal of Horticulture
Year : 2000, Volume : 57, Issue : 3
First page : ( 221) Last page : ( 223)
Print ISSN : 0972-8538.

Cytokinin and abscisic acid in xylem sap of mango cv. Alphonso grafted on rootstocks of contrasting vigour

Murti G.S.R., Upreti K.K., Reddy Y.T.N., Kurien Reju M.

Indian Institute of Horticultural Research, Hessaraghatta Lake Post, Bangalore 560 089

Summary

Studies on xylem sap yield and changes in endogenous hormones, cytokinin-t-zeatin riboside (t-ZR), dihydrozeatin riboside (DHZR) and absci-sic acid (ABA) in the xylem sap of cv. Alphonso grafted on polyembryonic rootstocks, Muvandan (vigorous) and Vellaikolamban (dwarf) showed that the sap yield and the levels of DHZR and ABA in xylem sap were markedly influenced by the root-stock in the grafted mango trees. There were lower sap yield and DHZR levels and higher ABA levels in Alphonso raised on dwarfing rootstock as compared to those raised on Muvandan. The dwarfing effect on scion rendered by dwarfing rootstock could be attributed to the lower xylem sap yield and lower levels of growth promoter like cytoki-nin (DHZR) and higher level of inhibitor (ABA) produced in the root and transported to shoot in the xylem sap.

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