Fig. 6. Effect of darkness on in vivo NRA in leaves of Pima (S-7) and Acala (Maxxa) cotton grown in 0.10 mM NO^-₃ at 30/20°C light/dark temperatures. Enzyme assays were performed without (open symbols) or with (closed symbols) 0.1 M KNO₃ in the assay medium. Each point is the mean of three replicates, with vertical lines representing ± standard error

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