Figure 9.
Photoinactivation of PSII Activity under High-Light Illumination.
(A) and (B) The maximal photochemical efficiency of PSII (Fv/Fm) was measured for detached leaves from the wild-type (squares), deg5 (circles), deg8 (triangles), and deg5 deg8 (diamonds) plants during exposure to irradiance of 1600 μmol m−2 s−1 (A) or 800 μmol m−2 s−1 (B) in the absence of lincomycin.
(C) Maximal photochemical efficiency of PSII (Fv/Fm) was measured for detached leaves from wild-type (squares), deg5 (circles), deg8 (triangles), and deg5 deg8 (diamonds) plants during exposure to irradiance of 1600 μmol m−2 s−1 in the presence of lincomycin.
(D) Recovery of maximum photochemical efficiency of PSII after photoinhibition. Leaves of wild-type (squares), deg5 (circles), deg8 (triangles), and deg5 deg8 (diamonds) plants were illuminated to induce ∼50% photoinhibition of PSII, and the restoration of maximal photochemical efficiency was subsequently followed at an irradiance of 20 μmol m−2 s−1. Time 0 represents dark-adapted samples before light and lincomycin treatment. Values shown are averages ± se of at least six replicated experiments.