IAA Distribution in the Hypocotyls and Primary Leaves of Phaseolus vulgaris L. Treated with Paclobutrazol in Relation to Their Rooting Capacity

Abstract

The IAA content and its distribution were investigated in hypocotyls and primary leaves of bean plants treated with paclobutrazol in connection with the root formation of intact plants, stem and leaf cuttings. The amount of IAA in paclobutrazol-treated hypocotyls is higher than that of the control but more IAA accumulated in the basal part of the treated hypocotyls. Accumulation of IAA in the basal region correlates well with the increased root system of intact plants and with the more intensive rooting of stem cuttings. Although the IAA level in treated primary leaves was also higher than in the control, distribution of the hormone between the petiole and leaf blade was not favourable for the rooting process.