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Effects of SNP on NIA1 dependent NO production in tobacco roots. Different concentrations of SNP (10–200 μM) were applied to 70 days old control tobacco plants under conditions as described in section “Materials and Methods.” DAF- FM Fluorescence was measured by fluorescence microscope (A) and intensity (B) was expressed as arbitrary units. Transcripts accumulation of NIA dependent NR gene was analyzed from tobacco after exposure of 50, 100, 150, and 200 μM SNP (C).
