Figure 1
Changes in the photosynthetic O 2 evolution rate (A) and the maximum quantum yield of primary photochemistry (F v /F m , B) in tobacco leaves infected with S. sclerotiorum . ●, ○ indicate control and infected leaves, respectively. Control leaves were leaves without infection by S. sclerotiorum. Leaf discs used for O2 evolution rate determination and Fv/Fm measurement were cut within the region 2 cm away from the centre of the necrotic spot with a 10-mm cork borer. Different letters indicate significant differences between the leaves with different treatments (P < 0.05). Values were means ± SE (n = 8).