Table 5.

Effects of Mn treatments on far-red light-induced steady state oxidation of P700 (ΔA_820–860, P700⁺), the relative intersystem electron donor pool size to PSI (e^– /P700) and half times for P700⁺ reduction (t_1/2)) of Arabidopsis leaves at 21 days of treatment Different lower-case letters indicate significant differences between the Mn treatments (P < 0.05). MT, multiple turnover; ST, single turnover.

Mn treatment (µM)	ΔA820–A860 (P700+)	e–/P700 (MTarea/STarea)	t1/2 (s)
Control	423.2±7.9a	20.7±0.9a	0.670±0.05b
50	416.4±8.3a	15.7±0.6b	0.812±0.06a,b
500	368.4±8.3b	16.4±0.6b	0.938±0.08a,b
1000	293.4±8.4c	15.6±0.5b	0.908±0.07a,b
1500	292.9±4.2c	13.0±0.3c	0.984±0.08a