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Effect of Put on NO accumulation in wild type. A, NO production reported as green fluorescence by using DAF-FM DA probes in representative roots. B, NO production expressed as relative fluorescence intensity. Fluorescence intensity in the +Fe-treated root was set to 100%, and intensity in the tested root was calculated relative to the corresponding control value. Error bars represent ± sd (n = 4). Different letters represent significant difference at P < 0.05.
