Growth Regulator Effects on Adventitious Root Formation in Leaf Bud Cuttings of Juvenile and Mature Ficus pumila.

by Fred T. Davies, Jr. and J. N. Joiner

Adventitious root formation was stimulated with foliar application of indolebutyric acid (IBA) from 1000 to 1500 mg/liter for juvenile and 2000 to 3000 mg/liter for mature leaf bud cuttings of Ficus pumila L. IBA increased cambial activity, root initial formation, and primordia differentiation and elongation. IBA stimulated rooting when applied to juvenile cuttings at 3, 5, or 7 days after experiment initiation, but had no effect on mature cuttings when applied at day 15, the final treatment period. The interaction of IBA/gibberellic acid (GA3) did not affect early root development stages, but reduced root elongation and quality once primordia had differentiated. IBA/6-(benzylamino)-9-(2-tetrahydropyranyl)-9H-purine (PBA) inhibited rooting at early initiation stages.

J. Ameri. Soc. Hort. Sci. 105(1): 91-95, 1980.