Figure 5.

A, Photographs showing photoinhibitory damage in leaves of transgenic (FtsZ) tobacco. B, Photoinhibition of photosystem II estimated by the Chl fluorescence ratio F_v/F_m as a function of the high-light illumination period in leaf discs of wild-type (▪ and ●) and transgenic (□ and ○) plants grown for 10 weeks under low light. Lincomycin (● and ○) treatment was applied for inhibition of the photodamaged PSII reaction center. C, Light response curve of photosynthetic O₂ evolution in leaf discs of the wild-type (▪) and transgenic (□) tobacco plants grown under high-light conditions. O₂ evolution in leaf discs were measured at 5% (v/v) CO₂ concentration at 25°C ± 1°C. Mean values (±se) for 15 leaf discs are shown.