Table 2.

PSII activity in isolated thylakoid membranes.

	Fo (a.u.)	Fm (a.u.)	Fv/Fm	O2 evolution
Wild type	0.073 ± 0.009	0.266 ± 0.031	0.727 ± 0.006	190±16
pgp1-2	0.326 ± 0.031	0.385 ± 0.045	0.151 ± 0.024	22±4

Thylakoid membrane samples corresponding to 5 μg chlorophyll ml⁻¹ were used for both plants. Values are mean ± SD (n = 8 for fluorescence analysis and 3 for O₂ evolution). Fo, minimum yield; Fm, maximum yield; Fv/Fm, maximum quantum yield of PSII. The steady-state rates of O₂ evolution (μmol O₂ mg chlorophyll⁻¹ h⁻¹) was measured in the presence of 1 mM DMBQ.