Figure 4.
Photosynthetic characteristics of wild-type and transgenic tobacco leaves (lines HPPD-PDH 17-1 and 24-4) grown under regular conditions. A, Quantum yield of PSII-mediated electron transport measured in attached leaves by the ΔF/Fm chlorophyll fluorescence parameter at different PFDs. Data are mean values of three separate experiments ± sd. B, Oxygen exchange by leaf discs (3.5 cm in diameter) at different PFDs. Each curve is from a representative experiment that was repeated at least three times with similar results.