Efeito de reguladores vegetais nos índices da análise de crescimento de plântulas de maracujazeiro-doce (Passifl ora alata Curtis)

Abstract

Effect of plant growth regulators on indices of growth analysis for sweet passion fruit seedlings (Passifl ora alata Curtis). The objective of this work was to investigate the effects of GA3 + IBA + cinetina on the growth of Passifl ora alata Curtis plants through growth analysis. The experiment was carried out by completely randomized block design, with six treatments and four replications. The plant growth regulators,gibberellin (GA3), auxin (IBA) and cytokinin (kinetin), were applied to leaves at concentrations of 0 (control), 25, 50, 75, 100, 125mL.L-1. The applications were performed at 48, 55, 52, 69, and 76 days after the emergence of the plants and the growths were evaluated fi ve times at 7-day intervals. The fi rst evaluations were accomplished 55 days after plant emergence. The leaf area ratio (RAF), specifi c leaf area (AFE), liquid assimilation rate (TCA), and relative growth rate (TCR) were analyzed. The following data were also analyzed for P. alataCurtis plants: leaf area, leaf lamina dry mass and total leaves dry mass. The growth analysis, which employed the ANACRES computer program, indicated that the growth regulators increased plant productivity.