Paclobutrazol as a strategy to induce reproductive precocity in sour passion fruit

Abstract The adoption of growth regulators can be an alternative method to modulate the quality propagation material and obtain reproductive precocity. objective was evaluate if a gibberellin biosynthesis inhibitor affects morphophysiological, biochemical anatomical parameters sour passion fruit seedlings such alterations affect period. Two trials were conducted. In trial I, 40 days after emergence, immersed up substrate level in paclobutrazol (PBZ) solutions at concentrations of: 0, 40, 80, 120 160 mg L-1. At 45 application PBZ - DAA, morphophysiology, biochemistry anatomy evaluated. Trail II conducted pots, using from trail I with DAA PBZ. 200 transplanting, accumulation shoots roots fresh dry mass (g), flowering speed index, total number organs SPAD index seedlings, restriction shoot induced by associated root increment, seedling quality, photosynthetic pigments optimization gas exchange. A shorter period transition juvenile – vegetative phase is observed when submitted concentrations.