Avaliação da germinação de feijão submetido a diferentes tratamentos com bioestimulante

Abstract

Biostimulants are plant growth substances (auxin, gibberellin, cytokinins, etc.) that can act alone or in combination, interfering in various physiological and / or morphological processes. In the treatment of seeds, the use of biostimulant can influence root growth, percentage and speed of germination, presenting variable responses depending on the crop. The objective of this study was to evaluate the germination of bean seeds (Phaseolus vulgaris L.), BRS Esteio cultivar, pre-soaked in different doses of a commercial biostimulant, composed of 50 mg L-1 of indolebutyric acid, 90 mg L -1 of kinetin and 50 mg L-1 of gibberellic acid. Eight (8) treatments and four (4) replicates of 25 seeds per treatment were adopted, and the design was completely randomized. The following treatments were used: T1: 0 mL (imbibition only in sterile distilled water); T2: 1mL; T3: 2.5 mL; T4: 5 mL; T5: 7.5 mL; T6: 10 mL; T7: 25 mL; T8: 50 ml of biostimulant per kg of seeds. The following variables were evaluated: germination (%), germination speed index (IVG), mean shoot length (CMPA), mean root length (CMR), fresh shoot mass (MFPA), dry shoot mass (MSPA), fresh root mass (MFR) and root dry mass (MSR) of germinated seeds. The same treatment presented significantly higher mean values for CMPA, CMR, MFR and MSR. The MFPA and MSPA variables were negatively affected by biostimulant pre-soaking. It was concluded that the dose of 10 mL of biostimulant per kg of seeds resulted in a higher percentage and speed of germination, shoot and root lengthening, and increase of fresh and dry biomass of the roots, while the different dosages of biostimulant in the treatment of bean seeds provided a decrease in the accumulation of fresh and dry shoot biomass in the germinated seeds.