Studies on the root regeneration in mango air-layers.
Rajan S., Ram S.
Author Affiliation: Department of Horticulture, G.B. Pant University of Agriculture and Technology, Pantnagar, India.
: 192-197
Abstract : IBA (0.0735 M) and NAA (0.0573 M), applied to 2-year-old shoots of 30-year-old Langra mango, increased both rooting percentage and root number during air layering in Oct. and Mar. The synergistic/antagonistic effect of adding NAA, GA3, p-hydroxybenzoic acid, pyrogallol, pyrocatechol, Ethrel [ethephon], benzyladenine and chlorogenic acid to IBA was studied. Endogenous rooting co-factors and inhibitors were extracted from air-layers, partitioned and bioassayed. The rooting co-factor activity of chloroform, ether and aqueous fractions increased at callusing and root emergence stages. IBA treatment resulted in an early rise in rooting co-factor and a fall in rooting inhibitor level (particularly in the aqueous fraction) leading to early rooting of IBA-treated mango layers.