Atividade fotossintética de genótipos de milho na presença e ausência de inoculação com Azospirillum brasiliense em diferentes condições de irrigação

Abstract

Inoculation of bacteria of the genus Azospirilum in corn seeds can promote plant development and increase crop productivity. These bacteria release substances that act on the roots and, under unfavorable conditions, suffer stress decreasing their efficiency. Water stress limits growth, productivity and affects physiological processes such as photosynthesis. Thus, the objective of this work is to study the photosynthetic activity of maize genotypes, in the presence and absence of inoculation with Azospirillum brasiliense, under different irrigation conditions.The experiment was conducted at the Federal University of Grande Dourados, on a Faculty of Agricultural Sciences greenhouse, at Dourados - MS, in 2018. The design was a randomized block in factorial arrangement with 2 factors: Genotype and Environment. The genotypes used were Bandeirantes, BRS-4103, Cativerde and LG-6030. And the environments were presence and absence of inoculation with Azospirillum brasiliense. The variables analyzed were (A): photosynthetic rate (µmol m-2 s-1), (GS): stomatal conductance (mol m-2 s-1), (E): perspiration (mmol m-2 s-1) , (T): leaf temperature (°C). Collected data were submitted to variance analysis and boxplot analysis. Thus, under the conditions in which the work was performed, photosynthetic activity did not vary according to genotypes and seed inoculation with Azospirillum brasiliense under different irrigation conditions.