Physiology and growth of maize under salinity of water and application of hydrogen peroxide

ABSTRACT The salinity of irrigation water or soil is the abiotic factor that most negatively impacts yield crops, including green maize, so it necessary to find alternatives ensure production. In this context, study aimed evaluate gas exchange, photosynthetic pigments, and growth maize under application hydrogen peroxide. experiment was conducted at Center Sciences Agrifood Technology, Pombal, PB, belonging Federal University Campina Grande, in period from January February 2015, using hybrid ‘AG 1051’. treatments consisted two levels (0.3 2.0 dS m-1) five concentrations peroxide (0, 40, 80, 160, 320 µmol L-1) applied via water. experimental design completely randomized, a 2 × 5 factorial scheme, with four replicates. ECw m-1 reduces transpiration, stomatal conductance, total chlorophyll, carotenoids, initial growth, but does not affect dry mass accumulation plants. Application H2O2 varying 0 L-1 causes reductions CO2 assimilation rate as well 160 for conductance plants irrigated m-1. up concentration increases plant height, culm diameter maize.