Table IV.

Photoinhibition of PSII measured as F_v/F_m

Measurements of F_v/F_m in 2-week-old plants grown at 700 to 1,000 μmol photons m^-2 s^-1 (HL) were suddenly transferred to 1,800 μmol photons m^-2 s^-1 (EL) for 4 h. Mean values of 10 measurements (plants) from two independent experiments. SE is shown in parentheses.

Plant	HL	EL
R-SV8	0.819 (0.004)	0.652 (0.018)
S-SV8	0.816 (0.004)	0.540a (0.030)

^aSignificant differences (t test, P < 0.05)