Figure 5.

Long-Term Photosynthetic Acclimation (LTR) in Photosynthetic Mutants.

For LTR measurements, plants were initially grown for 10 d under white light followed by a 6-d acclimation period. Seedlings were acclimated either to PSI or PSII light (see Methods) for 6 d or to PSI light for 2 d followed by 4 d under PSII light (PSI-II plants) or vice versa (PSII-I plants).

(A) F_s/F_m ratios calculated using measurements of the chlorophyll fluorescence parameters F_s (steady state fluorescence) and F_m (maximum fluorescence).

(B) Determination of chlorophyll a/b ratios. All values under the four conditions were calculated as the means of 50 individuals in at least three independent experiments. Bars indicate sd. Note that Ws-2 plants behaved identically to Col-0 with respect to F_s/F_m and chlorophyll a/b ratio changes under the different light conditions.