Table 1.

Changes in the dark maximal fluorescence (Fmd), the variable fluorescence in darkness/basal fluorescence in darkness (Fvd/Fo), ratio and the effective PSII yield (YII) in WT and STXA2 strains. The cultures were adjusted to 4 ×·107 cells before the measurements. Y(II) values were measured from cultures grown at growth light conditions (50 µmol photons m⁻²·s ⁻¹) in the WT and STXA2 in the presence of inducer (0 h), and STXA2 after inducer removal (48 h). Data are means ± sd from three biological replicates in all cases.

Strain	Fmd	Fvd/Fo	Y(II)
WT 0 h	0.471 ± 007	0.535 ± 0.027	0.319 ± 0.009
STXA2 0 h	0.367 ± 011	0.333 ± 0.008	0.283 ± 0.005
STXA2 48 h	0.147 ± 012	0.221 ± 0.021	0.138 ± 0.022