Table 1.

Growth phase-dependent changes in chl a fluorescence parameters of Synechocystis

OD730	F0		FM (dark)		FM (GL)		FM (DCMU)		φ PSII (max)
	As is	At 0.45	As is	At 0.45	As is	At 0.45	As is	At 0.45	As is	At 0.45
0.25	159	262	304	501	297	489	299	492	0.48	0.48
0.45	213	213	438	438	438	438	450	450	0.53	0.53
0.8	312	204	601	440	628	426	685	437	0.55	0.54
1.2	342	191	653	417	699	418	752	417	0.55	0.54
1.7	393	189	761	419	759	435	914	423	0.57	0.57
2.0	512	195	854	410	870	439	1197	433	0.57	0.56

Variable fluorescence parameters were calculated from duplicate PAM fluorimetry traces as shown in Figure 2. The error between traces was <5%. Values from both undiluted (as is) and diluted or corrected (at 0.45) PAM recordings are shown. OD₇₃₀, optical density at 730 nm; F ₀ minimal fluorescence after dark adaptation; F _M fluorescence after a saturating pulse in the dark or in growth light intensity (dark, GL), or after the addition of DCMU; φPSII, yield on PSII ((F_M−F₀)/F_M). Values for φPSII are calculated with F₀ and the highest recorded values for F_M (marked in bold)