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Wheat leaf ascorbate (AsA) content (a), DHA content (b), AsA/DHA ratio (c), GSH content (d), GSSG content (e) and GSH/GSSG ratio (f) induced by nitric oxide donor and arginine under drought stress conditions. SNP and Arg indicate 500 µM sodium nitroprusside and 500 µM l-arginine, respectively. The mean (± SD) was calculated from three replicates for each treatment. Bars with different letters are significantly different at P < 0.05 according to Tukey’s HSD test
