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Wheat leaf endogenous nitric oxide content induced by nitric oxide donor and arginine under drought stress conditions. Here, SNP and Arg indicate 500 µM sodium nitroprusside and 500 µM l-arginine, respectively. The mean (± SD) were calculated from three replicates for each treatment. Bars with different letters are significantly different at P < 0.05 according to Tukey’s HSD test
