Table I.

Dark-adapted F_v/F_m ratios, light-saturated rates of O₂ evolution, chlorophyll contents, and leaf absorptivities (400–700 nm)

Cu2+ Concentration of Growth Medium	Fv/Fm	O2 Evolution	Chl Content	Light Absorptivity
μm		μmol mg−1 Chl h−1	g m−2
0.3	0.837  (n = 9)	439  (n = 6)	0.16	0.75
1	0.850  (n = 6)	*a	*	*
2	0.836  (n = 6)	*	0.16	*
3	0.839  (n = 7)	*	*	*
4	0.809  (n = 10)	402  (n = 5)	0.15	0.59
6	0.751  (n = 6)	*	*	*
8	0.744  (n = 6)	*	*	*
12	0.750  (n = 6)	*	*	*
15	0.738  (n = 6)	*	0.11	*

The light-saturated rate of O₂ evolution was measured from thylakoids isolated from bean plants grown for 2 weeks in the presence of 0.3 to 15 μm Cu²⁺; the other parameters were determined from the leaves. The F_v/F_m and O₂ evolution measurements were done on 5 to 10 different cultivation batches, as described, and the chlorophyll (Chl) and absoptivity data are based on measurements from one cultivation batch.

^a*, Not determined.