Table I.

Description and physiological characteristics of the PsaD mutants

Strain	Mutation	Doubling Time	Chlorophyll in Trimers	Fd-Mediated NADP+ Photoreduction Ratea
		h	%	μmol NADPH/nmol PSI/h
WT	None	40	46	1.44
D10	R111C	38	72	0.81
DE	K117A	42	67	1.48
DF	K131A/K135A	58	41	1.30
DΔCt	Δ105–140	36	65	0.91

Cell growth was followed by optical density measurements of the cell suspension at 730 nm.

^a Rates of NADP⁺ photoreduction were measured at a Fd concentration of 0.05 μm.