Figure 4: KEA3 regulates the dynamics of photosynthesis during transitions from high to low light.
From: Ion antiport accelerates photosynthetic acclimation in fluctuating light environments
(a,b) NPQ relaxation on transition from high to low light is delayed in kea3 (kea3-2) as compared with WT (Ws). (c) ΦII is decreased during transition from high to low light. ΦII was calculated from the same measurement as in a,b. (d) WT (Ws) and kea3 (kea3-2) show similar CO2 assimilation rates during steady-state high (HL, 700 μmol photons m−2 s−1) and low light (LL, 70 μmol photons m−2 s−1). (e) The normalized CO2 assimilation rate (shown as a percentage of the difference between HL and LL) is decreased in kea3 (kea3-2). (f) In fluctuating light, NPQ relaxation is delayed after each transition from high to low light in kea3-2. (g) ΦII is decreased in kea3-2 during each transition from high to low light. ΦII was calculated from the same measurement as in (f). (c,e) Asterisks represent significantly lower values in kea3-2 (**0.001<P<0.01, ***P<0.001, Student’s t-test). (b–g) Error bars represent s.e.m. (b–e: n=7; f,g: n=4).
