Fig. 5. Effect of light on in vivo NRA in leaves of Pima (S-7) cotton grown in 1.0 mM NO^-₃ at 30/20°C throughout (A) or with last cycle of 30/30°C (B) light/dark temperatures. Vertical lines above the bars show the standard error of means of three replicates. In each panel, bars with the same letter are not significantly different as determined by Duncan's multiple range test (P = 0.05)