Fig. 6.

Light-dependent linear photosynthetic electron transport and NPQ in the wild type and Trx f-deficient mutants. (A) Relative linear electron transport rates of photosystem II, ETR (II) was measured in pre-illuminated attached leaves of plants grown at 125 μE m⁻² s⁻¹ under short-day conditions. Chlorophyll fluorescence of photosystem II was determined using a pulse-amplitude modulation fluorimeter. Each data point is the mean ±SD of the ETR (II) from eight plants under short-day conditions. PAR (photosynthetically active radiation). (B) Quantum yields of NPQ from the corresponding light-titration curves in (A). Statistical significance (*P <0.05; **P <0.01; ***P <0.001) was determined with Student’s t test comparing values for each of the mutant lines with the wild type.