Efeitos fisiológicos atribuídos ao teste de frio e adição de reguladores vegetais em híbridos de milho

The study aimed to verify the response of corn hybrids on the use of doses of phytoestrogens, seeking to identify the regression curve the best dose x percentage of seed germination. The study was conducted at the Laboratory of Production and Seed Technology , Federal University of Santa Maria Frederico Westphalen Campus - RS . The experimental design was randomized blocks arranged in a 4x5 factorial scheme with hybrid x doses of plant growth regulators. The corn hybrids used in the study were : 2A106 , P1630H , P2530 and STATUS , subject to these doses of 0 , 5 , 10 , 15 and 20 ml per kilogram of seed plant growth regulators compound. Analysis of variance showed significant dose x hybrid interaction of phytohormones for the variables, first germination , germination , length of root and shoot , shoot dry weight and dry weight of seedlings. The dry weight of radicle showed no interaction between the factors. Doses of plant growth regulators influence the magnitude of physiological traits in hybrid submitted to cold. O test hybrid P1630H responds positively to a dose of 10 mL Kg -1 of plant growth regulators, for the characters percentage of germinated seeds and dry mass of shoots. For hybrid 2B688Hx positive effects are revealed at a dose of 5 mL Kg -1 of plant growth regulators, the characters first count, percentage of sprouted seeds, length of root and shoot, dry matter and seedling shoots.