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Diurnal Fluctuations of Nitrate Uptake and In Vivo Nitrate Reductase Activity in Pima and Acala Cotton

Dep. of Agronomy and Range Science, Univ. of California, One Shields Avenue, Davis, CA, USA 95616-8515

View larger version (26K): [in a new window]   Fig. 1. Effect of light on net NO-3 uptake by Pima (S-7) and Acala (Maxxa) cotton seedlings grown in 0.1 mM NO-3 at 30/20°C light/dark throughout (A) or 30/30°C light/dark for one cycle (B) prior to measurements. Uptake rates were measured at 30°C. Open and closed symbols represent measurements from different sets of plants during the time course

View larger version (26K): [in a new window]   Fig. 2. Effect of darkness on net NO-3 uptake, at 20 and 30°C, by Pima (A) and Acala (B) cotton seedlings grown in 0.1 mM NO-3 at 30/20°C light/dark temperatures. The seedlings at the end of the light cycle were transferred into the uptake solutions and placed in the dark for the measurement of uptake rates at 20°C (circles) or 30°C (triangles). Open and closed symbols represent measurements from different sets of plants during the time course

View larger version (27K): [in a new window]   Fig. 3. Effect of light duration on in vivo NRA in leaves of Pima (S-7) and Acala (Maxxa) cotton grown in 0.05 (A), 0.1 (B) or 1.0 (C) 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

View larger version (43K): [in a new window]   Fig. 4. Effect of glucose and NO-3 additions on in vivo NRA in leaves of Acala cotton grown in 0.1 mM NO-3 at 30/20°C light/dark temperatures. Leaf samples were harvested either at the beginning of light period (A) or after 1 h exposure to light (B). 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)

View larger version (40K): [in a new window]   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)

View larger version (26K): [in a new window]   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