Moléculas sinalizadoras na indução a tolerância aos estresses abióticos durante a germinação e desenvolvimento de plântulas de tomate tipo grape

Abstract

Physiological conditioning is one of the most sustainable and low-cost techniques used to obtain vigorous seedlings and induce tolerance to adverse situations. Given this, the objective of this study was to evaluate the effect of physiological conditioning on Solanum lycopersicum grape seeds subjected to different abiotic stresses. A completely randomized design with four replicates was used in a 5x4 factorial scheme, with 4 conditioning factors + 1 control and 4 stress conditions for germination. The seeds were subjected to conditioning for 24 hours in solutions of chitosan, hydrogen peroxide, and sodium nitroprusside, in addition to hydroconditioning and control. The germination process occurred in a saline medium, simulated by NaCl solution, dry, induced by polyethylene glycol (PEG), thermal, with alternating temperatures of 20-30oC, and distilled water simulating normal germination conditions. Thus, germination and seed vigor were determined through first germination count, IVG, T50, and image analysis tests. As a result of physiological conditioning, the use of the H2O2 molecule was beneficial in minimizing the effects of salinity and high temperatures. Thus, the use of signaling molecules via physiological conditioning is one of the promising alternatives in the face of environmental adversities.