Seleção de genótipos de semente de milho submetidos ao estresse hídrico

Abstract

Corn (Zeamaysssp.), Is the most cultivated cereal in the world, with China and the USA being the largest producer and Brazil occupying third place among the largest exporters. Although it is highly susceptible to water stress, about 59% of Brazilian corn is grown in our ecosystem. In Maranhão, the reality of producers is characterized by the use of rustic varieties and the absence of technology in the production system. Therefore, in its production it presents a drop, due to factors inherent to the culture, both from the point of view of soil and climate. Thus, for the farmer to be successful in the cultivation of corn, it is necessary to use seeds of good quality and adapted to climatic variations to provide better productivity indexes. The objective of this study was to evaluate the physiological potential in terms of classifying lots corn seeds tolerant to water stress and with high vigor. The experiment was carried out in the seed analysis laboratory of the State University of Maranhão - UEMA. 3 lots of corn seeds were sown on substrates with osmotic potentials of 0.0; -0.2; -0.4;-0.6 and -0,8Mpa. The water content, germination test, first count and germination speed index were evaluated