Influ?ncia do ?cido giber?lico sobre a germina??o de sementes de milho

Maize (Zea mays L.) is widely cultivated and consumed in Brazil, as well as in other countries. This culture has great adaptability in different growing environments, so when sowing is carried out, it is preferable that fast germination occur, because the seeds are exposed to pest attack, and can accelerate the deterioration process. The objective of the present work was to evaluate the germination process of maize seeds submitted to different concentrations of gibberellic acid, in order to visualize their influence on the germination of the seeds of this crop. The experiment was carried out at the Laboratory of Plant Physiology of the Federal University of the Southern Frontier - UFSS, Cerro Largo campus. In order to conduct the experiments, we used 7- treatments that refer to different concentrations of gibberellic acid, which vary between 0, 10, 50, 100, 200, 500 and 1000 ppm, with a completely randomized design (DIC). four replicates of 50 seeds, totaling 28 experimental units. The evaluated parameters were percentage of germination, of normal seedlings, abnormal seedlings and dead seeds, also the germination speed index test was performed. The results were submitted to analysis of variance (ANOVA), using the SASM-agri program, posterior, submitted to regression analysis. With the results obtained, it was observed that, in corn seeds, the application of gibberellic acid resulted in the reduction of germination percentage and normal seedlings, increase of abnormal seedlings and dead seeds. For the germination rate index (IVG), the higher the concentration of gibberellic acid the lower the IVG, therefore, it is concluded that the results found do not positively influence the application of gibberellic acid in maize seeds.O milho (Zea mays L.) ? amplamente cultivado e consumido no Brasil, assim como, em outros pa?ses. Essa cultura possui grande adaptabilidade em diferentes ambientes de cultivo, desse modo quando realizada a semeadura, ? prefer?vel que ocorra a r?pida germina??o, pois as sementes est?o expostas ao ataque de pragas, podendo acelerar o processo de deteriora??o das mesmas. Com isso, o objetivo do presente trabalho foi avaliar o processo germinativo de sementes de milho submetidas a diferentes concentra??es de ?cido giber?lico, buscando visualizar sua influ?ncia sobre a germina??o das sementes dessa cultura. O experimento foi realizado no Laborat?rio de Fisiologia Vegetal da Universidade Federal da Fronteira Sul ? UFSS, campus Cerro Largo. Para a condu??o dos experimentos, utilizou-se o Delineamento Inteiramente Casualizado (DIC), foram utilizados 7 tratamentos que referem a diferentes concentra??es de ?cido giber?lico, as quais variam entre 0, 10, 50, 100, 200, 500 e 1000 ppm, com quatro repeti??es de 50 sementes, totalizando 28 unidades experimentais. Os par?metros avaliados foram porcentagem de germina??o, de pl?ntulas normais, pl?ntulas anormais e sementes mortas, realizou-se tamb?m o teste de ?ndice de velocidade de germina??o. Os resultados obtidos foram submetidos a an?lise de vari?ncia (ANOVA), utilizando o programa SASM-agri, posterior, submetidas a an?lise de regress?o. Com os resultados alcan?ados, observou-se que em sementes de milho, a aplica??o de ?cido giber?lico resultou, na redu??o da porcentagem de germina??o e de pl?ntulas normais, aumento de pl?ntulas anormais e sementes mortas. Para o ?ndice de velocidade de germina??o (IVG), quanto maior a concentra??o de ?cido giber?lico menor o IVG, portanto, conclui-se que os resultados encontrados n?o influenciam positivamente a aplica??o de ?cido giber?lico em sementes de milho