Figure 4.

Φ_II and NPQ measurements in adult wild‐type and sig2 mutants. (a) Representative image of adult plants grown on soil under white light (100 μmol m⁻² s⁻¹, long‐day condition with 8 hr dark/16 hr light cycle) at 22°C for 30 days. The scale bar indicated 1 cm. (b) Heatmap showing the level of Φ_II (photochemical efficiencies of PSII) and NPQ (nonphotochemical quenching), calculated from chlorophyll fluorescence images captured under five different light regimes (R1 to R5) during the course of 5 days using two‐week‐old plants grown on soil under white light (100 μmol m⁻² s⁻¹). R1, constant light (100 μmol m⁻² s⁻¹); R2, sinusoidal light with maximum 500 μmol m⁻² s⁻¹; R3, fluctuating light between two sinusoidal light intensity curves with maximum 1000 μmol m⁻² s⁻¹; R4 and R5, repeat R1 and R3, respectively. Difference between mutants and wild‐type (WT) was shown. Red denotes increased relative level of Φ_II or NPQ in mutants compared to WT; blue denotes decreased level of Φ_II or NPQ in mutants compared to WT