SOME RESPONSES OF PLANTS TO 2,3,5-TRIIODOBENZOIC ACID

Abstract

Inhibition of rooting of terminal cuttings of Coleus blumei was obtained following 24-hr. soaking in solns. containing 2,3,5-triiodobenzoic (TIBA) acid ranging from 5 to 250 ppm. Slight stimulation of rooting was noted following treatment with 1 ppm. TIBA. Evidence is presented that TIBA may reduce the stimulatory effect of indolebutyric acid. Applications of the acid in lanolin made above the bud stimulated axillary bud development of red kidney bean and California privet, but no stimulatory effects resulted from applications made below the buds. Formative effects are noted for red kidney bean but not for Coleus and privet.