Crescimento de plantas de Salvia officinalis sob ação de reguladores de crescimento vegetal

Abstract

The objective of this study was to estimate the effects of different plant regulators on the index growth analysis application of sage plants. An experiment was conducted in a greenhouse with controlled temperature and relative humidity, at the Departmento de Botânica, Instituto de Biociências, Universidade Estadual Paulista, UNESP, Botucatu, SP, Brazil. The experimental design was completely randomized, with five treatments containing three replicates. Treatments consisted of the spraying of the solution of 100mg L-1 of gibberellic acid (GA3); 100mg L-1 of benzylaminopurine (BAP); 100mg L-1 of 2-chloroethyl phosphonic acid (ethephon); Stimulate® at 2% (90mg L-1 of kinetin, 50mg L-1 of gibberellic acid and 50mg L-1 of indolylbutyric acid) and water (control). Applications of plant growth regulators were performed in 3 times, at 15, 25, and 35 days after transplanting, and growth was evaluated in five successive harvests at 21-day intervals, performed at 47, 68, 89, 110, and 131 days after transplanting. The following growth index were determined: leaf area ratio (LAR), specific leaf area (SLA), net assimilation rate (NAR), and relative growth rate (RGR). These results suggest that the plant growth regulators influence the index growth analysis. The plants treated with BAP presented increase values of LAR to the 47 days after transplanting. The plants treated with GA3 to NAR presented increase until the 131 days after transplanting. The RGR is decreasing for all the treatments with vegetal regulators tested and the control.