Singlet oxygen scavenging activity of plastoquinol in photosystem II of higher plants: Electron paramagnetic resonance spin-trapping study

►Illumination of PQ-depleted PSII membranes results in 1O2 formation. ►The addition of exogenous plastoquinol significantly suppressed 1O2 formation. ►Plastoquinol acts as efficient 1O2 scavenger in PSII under oxidative stress.