Figure 1.

Effects of the altered levels of NO and H₂O₂ on cell viability. The levels of NO and H₂O₂ were altered in tobacco cv BY-2 cells by adding SNP and GOG, respectively, in the culture medium. A, Glc (0.5 mm) and Glc oxidase (0.5 unit mL⁻¹) plus: 0.05 mm (●), 0.5 mm (▵), and 5 mm (▪) SNP. B, SNP (0.5 mm) plus Glc (0.5 mm) and: 0.05 unit mL⁻¹ (●), 0.5 unit mL⁻¹ (▵), and 1 unit mL⁻¹ (▪) Glc oxidase. Cell viability was analyzed over time. Values represent mean ± se of five experiments.