Effect of umbelliferone,as rooting stimulator,on endogenous growth substances in bean cuttings

Endogenous growth substances were estimated byAvena coleoptile test in hypocotyls of cuttings ofPhaseolus vulgaris which were treated with Umbelliferone, a coumarin which has been found to have a stimulating effect on rooting. A similar growth promoting zone which corresponded chromatographically to indole-3-acetic acid, was found in both treated and control cuttings. A growth-inhibiting zone detected in control extracts was absent in UM treated cuttings. The results are discussed in relation to Umbelliferone effect on rooting stimulation.