Composés phénoliques, acide β-indolacétique et activité auxines-oxydasique

Abstract

Summary. — Lens' roots IAA oxidase activity has been studied in presence of a few phenolic effectors. The results from the literature that monophenolic compounds are auxin-oxidasic activators while o-diphenolic derivatives act as inhibitors have been confirmed. A close relationship between the positive or negative action of the phenolic effectors and their antagonism or synergism with the auxin activity is suggested and discussed. The IAA-oxidasic inhibitors have been found able to form complexes with IAA. Monophenolic compounds do not form complexes. The biological significance of these complexes is discussed to explain the synergistic effects and the sparing of IAA by reduction of the auxin-oxidasic activity.