Figure 3.
Photosynthesis is reversibly slowed down in the ptox2 mutant in the intermittent-light regime. The intermittent light corresponds to cycles of 1 min of dark and 1 min of light (340 μE m−2 s−1) in heterotrophic conditions. A, Kinetics of ΦPSII changes in the wild type (WT; blue squares) and the ptox2 mutant (orange circles) during 30 min of intermittent light (black bar; measured at the end of the light period) and a subsequent continuous-light (50 μE m−2 s−1) recovery (gray bar). B, Initial value of the ΦPSII after the first illumination period. C, ΦPSII after the last illumination period of the 30-min treatment. D, ΦPSII in cultures acclimated to a 0/340 μE m−2 s−1 intermittent light for several generations. E, ΦPSII after a 15-min continuous-light recovery after fluctuating-light treatment. F, ΦPSII after a 15-min continuous-light recovery of the cells acclimated to intermittent light for multiple generations. n = 4 ± sd for B to F.