Among the component gibberellins – GA4 followed by GA3,GA7 and GA1 were the major gibberellins identified in the buds and leaves of paclobutrazol untreated trees, with buds recording
high levels of these gibberellins. Other minor gibberellins identified were GA5, GA9, GA13 and GA25. Both in buds and leaves of paclobutrazol untreated trees, the gibberellin content showed
declining trends from 30 days before flowering till bud break, and
buds experienced greater decline than the leaves. Following paclobutrazol application, different gibberellins declined and the concentration trends witnessed with respect to stages were similar as observed in the untreated trees. The magnitude of decline in major identified gibberellins by paclobutrazol was
dependent on stages. While paclobutrazol induced decline in GA1 was more in the buds and leaves at 15 days before bud break, GA3,GA4 and GA7 registered greater decline at bud break stage. The
paclobutrazol induced decline in gibberellins is substantiated by
the earlier reports that paclobutrazol inhibits gibberellin biosynthesis