Table 1. Chlorophyll Concentration Index (CCI) of leaves of three varieties of S. integra grown in various Pb concentrations for 14 days.

	Varieties
Pb (µM)	Yizhibi	Weishanhu	Dahongtou
0	13.05±0.93a	13.77±0.16a	11.79±1.14a
47	8.50±0.53b	8.84±0.53b	8.40±0.08b
123	5.58±0.23c	6.39±1.01c	6.20±1.47c
178	6.13±0.78c	6.18±0.68c	6.13±0.72c
196	4.78±0.13c	5.43±0.16c	5.27±0.13c

Values are mean ± S.D. (n = 6), and data with different letters in the same column indicate a significant difference at P<0.05 according to Fisher's LSD test.