Abstract
Salt stress supresses the productivity of plants. One important way to mediate the harmful effects of Na+ in plants is the compartmentation of Na+ into vacuoles, which is mediated by NHX-like Na+/H+ antiporters. In this study, the expression level of GhNHX1 gene encoding antiporter was evaluated under 100 mM and 200 mM concentration of NaCl in 31 cotton genotypes. As a result of the ANOVA analysis, a significant differences was recorded in the expression level of the gene under 0 mM and 200 mM stress conditions. A decrease in the expression level of this gene was observed in highly sensitive varieties (Ganja-182 and Carisma) and both an increase and a decrease in tolerant varieties. Such diversity in tolerant varieties shows that the resistance of samples is controlled by separate dominant genes.
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