Condicionamento fisiológico de sementes de arroz

Abstract

Seed priming is a technique that involves the controlled hydration of seeds up to reach the right level to activate the essential metabolic process of germination, without allow radicle protrusion.The aim of this study was to evaluate the effect of different procedures of priming on germination and seed physiological potential of rice seeds. Rice seeds, cultivars Puita Inta CL and Inov CL, each represented by one lot were used. The treatments consisted of: non-primed seeds, hydropriming, primed with biostimulating Stimulate® at dose of 0.5 L 100 kg-¹ seed, priming with 0.08 M boric acid solution and priming with 0.04 M zinc sulfate solution, with four replications for each treatment. Before seed priming, seeds hydration curves were determining to allow identifying the best time to procedure the seed conditioning process. After priming, seeds were evaluated by germination and physiological potential, by germination test, seedling growth, efficiency of endosperm use, cold test and seedling emergence. Priming procedures used in this study did not contribute to improve germination and seed physiological potential of rice cultivars Puita Inta CL and Inov Cl. Boric acid seed priming had a negative effect on seed performance of both cultivars.