Figure 2From: Mechanisms by which the infection of Sclerotinia sclerotiorum (Lib.) de Baryaffects the photosynthetic performance in tobacco leavesEffect of HCl (pH 4.0), H 3 PO 4 (pH 4.0), H 2 C 2 O 4 (40 mM, pH adjusted to 4.0), K 2 C 2 O 4 (40 mM) and KCl (80 mM) treatment on F v /F m (A) and OJIP curves (normalized, B) in tobacco leaves. ■indicates leaves before treatment; □ indicates leaves 2 hours after high-light treatment. Leaf discs (10 mm diameter) were infiltrated with HCL (pH 4.0), H3PO4 (pH 4.0), H2C2O4 (40 mm, pH adjusted to 4.0), K2C2O4 (40 mm) and KCl (80 mm) under darkness for 3 h, followed by exposure to high-light (800 μmol m-2 s-1) for 2 hours. CK were leaves without any reagent treatment. Different letters indicate significant differences between leaves with different treatments (P < 0.05). Values were means ± SE (n = 8).Back to article page