Figure 5.

Light-response curves of chlorophyll a fluorescence parameters of Arabidopsis wild type (WT) and galactolipid mutants grown at normal light (120 μmol m⁻² s⁻¹) for 35 d. Plants were dark adapted for 15 min prior to the measurements and exposed for 3 min to each light intensity. A, Light-response curves of PSII quantum yield, showing the increase in PSII photosynthetic efficiency of the two GlcT-complemented lines relative to dgd1 and dgd1dgd2. B, Light-response curves of qL, a measure for the redox state of the PSII acceptor site. C, Light-response curves of nonphotochemical quenching (qN). PAR, Photosynthetic active radiation.