Figure 7.

Acclimation to 530 µmol photons m⁻² s⁻¹ of red light followed by recovery in CC-4533 and Crvtc2-1 cultures grown photoautotrophically in HS medium at 530 µmol photons m⁻² s⁻¹. A, NPQ kinetics. Data were analyzed by one-way ANOVA followed by Dunnett’s posttest: ####, P < 0.0001, compared to the CC-4533 strain at the respective time poin. µE, µmol photons m⁻² s⁻¹. B, De-epoxidation index. C, F_V/F_M parameter measured after dark adaptation and after recovery from the 530 µmol photons m⁻² s⁻¹ red light illumination. D, The 684/710 nm ratio of the 77 K fluorescence spectra. The samples were collected at the growth light of 530 µmol photons m⁻² s⁻¹, after 30 min of dark adaptation, at the end of the 30 min red light illumination, and 12 min after the cessation of actinic illumination, as indicated in the scheme in A. The presented data are based on eight independent experiments. When applicable, averages and ses (±se) were calculated. Data were analyzed by one-way ANOVA followed by Dunnett’s posttest:×, P < 0.05, ××, P < 0.01, and ×××, P < 0.001, compared to the dark-adapted CC-4533 strain.