Morfofisiologia do algodoeiro naturalmente colorido sob águas salinas e aplicação foliar de peróxido de hidrogênio.

Abstract

In the semiarid region of northeastern Brazil, the occurrence of water with high salt concentrations promotes osmotic and ionic limitations on plants, becoming a limiting factor for agricultural production in this region; however, low concentrations of hydrogen peroxide may increase salinity tolerance. In this context, the present work aimed to evaluate the morphophysiology of the naturally colored 'BRS Jade' cotton under hydrogen peroxide (H2O2) leaf spraying on acclimatization to saline stress, where the plants were conducted in lysimeters under field conditions, in the field. Center for Agri-Food Science and Technology belonging to the Federal University of Campina Grande. The treatments were distributed in a randomized block design in a 5 x 5 factorial arrangement, with five levels of electrical conductivity of the irrigation water - ECa (0.3, 2.0, 3.7, 5.4 and 7.1 dS). m-1) and five hydrogen peroxide concentrations (0, 25, 50, 75 and 100 μM), with three repetitions, totaling 75 experimental units. Increased irrigation ECa affects the growth of BRS Jade cotton plants. BRS Jade cotton reduces its gas exchange when the electrical conductivity of the water increases. The 75 μM hydrogen peroxide concentration causes acclimation to saline stress on stomatal conductance, transpiration and CO2 assimilation rate.