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Fig. 5 | BMC Plant Biology

Fig. 5

From: Photoinhibition and photoinhibition-like damage to the photosynthetic apparatus in tobacco leaves induced by pseudomonas syringae pv. Tabaci under light and dark conditions

Fig. 5

Relative changes in PSI complex activity after Pst infection in tobacco leaves. a. Modulated reflected signal of 820 nm (MR820 nm) was evaluated after leaves had been inoculated with distilled water (mock) or P. syringae pv. tabaci (Pst) for 1 (a, b), 2 (c, d), or 3 days (e, f) under light and dark conditions. The treated leaves were illuminated with red light (2.5 s) and the MR820nm signal changes were simultaneously recorded. The initial MR820nm rate indicates PSI activity. Every curve is the average of 10 replicates. b. The PSI complex activity was evaluated after leaves were inoculated with distilled water (mock) or Pst for different periods under light (a) and dark (b) conditions. The initial PSI complex activity of untreated tobacco leaves was considered 100 %, while the activities of mock- and Pst-treated leaves were calculated as the percentage of activity in untreated leaves. Means ± SE of 10 replicates are presented. Different letters above the columns indicate significant differences at P <0.05 between different treatments

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