Table 3.

Accessibility of NH₂OH to PSII donor side in cells

PSII activity*
NH2OH, μM	WT	ΔpsbQ	QHis	HT3
0	576 ± 7	544 ± 4	572 ± 11	554 ± 4
	(100 ± 1.3)	(100 ± 0.7)	(100 ± 1.9)	(100 ± 0.7)
100	468 ± 7	421 ± 4	450 ± 4	450 ± 4
	(81.3 ± 1.3)	(77.5 ± 0.7)	(78.6 ± 0.6)	(81.2 ± 0.6)
1,000	342 ± 11	280 ± 14	324 ± 7	331 ± 22
	(59.3 ± 1.9)	(51.7 ± 2.6)	(56.6 ± 1.3)	(59.7 ± 3.8)

*Oxygen evolution rates are given in units of μmol of O₂ · mg⁻¹ of Chl · h⁻¹ ± the standard error of the mean (n = 3), and the values in parentheses indicate the percent activity ± the standard error of the mean (n = 3) relative to that in the absence of NH₂OH for each strain.