Hydrogen peroxide in the acclimation of colored-fiber cotton genotypes to salt stress

ABSTRACT The excess of salts in irrigation water restricts agricultural exploitation arid and semi-arid regions. Thus, searching for strategies cultivation under salt stress conditions is important the expansion irrigated agriculture these objective this study was to evaluate gas exchange growth rates naturally colored-fiber cotton genotypes with saline exogenous foliar application hydrogen peroxide concentrations. experiment carried out greenhouse conditions, Campina Grande - PB, using randomized block experimental design 4 × 3 2 factorial arrangement, four concentrations H2O2 (0, 25, 50, 75 µM), three CG (BRS Rubi; BRS Topázio; Verde) two levels electrical conductivity ECw (0.8 5.3 dS m-1), replicates. Irrigation m-1 associated 50 µM favors Rubi cotton, at 60 days after sowing. Salinity applications increased percentage cell damage internal CO2 concentration, but reduced stomatal conductance, transpiration, assimilation rate, Topázio cotton.