Figure 1From: Oxidative stress and leaf senescenceEffect of paraquat on Net Photosynthesis Rate (Pn) in wheat leaves. Pn was quantitated before and after treatment with three different concentration of 0, 300 and 600 μM of paraquat. Paraquat treatment significantly decreased Net Photosynthesis Rate in all stages A, B, and C of development (P < 0.01).Back to article page