Table IV.

Results of curve fitting for the kinetics of quenching in LHCIIb, chloroplasts, and leaves

Sample	D/L	pH	Fq	Fu	k	τ1/2	qN0
			relative units		1/s	s
LHCII	D	4.2	63	29	0.001	15.7	0.68
	D	5.5	47	35	0.0004	43.6	0.57
	L	4.2	70	28	0.003	4.5	0.71
	L	5.5	54	25	0.0009	20.6	0.68
Chloroplasts	D		38	46	0.0013	20.0	0.45
	L		46	24	0.004	5.4	0.66
Leaves	D		60	31	0.001	15.2	0.65
	L		78	14	0.0024	5.3	0.85

D and L, Samples prepared from dark-adapted and light-treated leaves, respectively; k, second-order rate constant of quenching; τ_1/2, quenching half-time calculated as 1/(F_q*k); qN₀, maximum potential quenching calculated as F_q/(F_q + F_u). See text for details of calculation.