Characterization of Detailed Chlorophyll Fluorescence in the Wild Type and
hhl1 Mutants.
(A) Light-response curves of PSII quantum yield and ETR
in wild-type and hhl1 mutants. The measurements were performed
at the following light intensities: 0, 81, 145, 186, 281, 335, 461, 701, and
926 μmol photons m−2 s−1. HL, high
light.
(B) Time courses for induction and relaxation of NPQ before and after 3-h high-light
treatment. Actinic light (500 μmol photons m−2
s−1) was switched on at time zero, and plants were left in
the dark after 12 min.
(C) Recovery of maximal photochemical efficiency of PSII after photoinhibition. Maximal
photochemical efficiency of PSII (Fv/Fm) during
recovery period at irradiance of 100 μmol photons m−2
s−1 was measured by following the photoinhibition
treatment to 50% of the initial Fv/Fm values. Data for wild-type (Col-0),
hhl1-1, and
hhl1-2 plants are presented as mean
± se. Five biological replicates were performed, and similar
results were obtained.