Fig. 1

Effect of Cd levels and time of Cd exposure on Cd concentration in barley shoots and roots. The data are Cd concentration in shoots of W6nk2 (a) and Zhenong8 (b), and in different regions of roots of W6nk2 (c, d, and e) and Zhenong8 (f, g, and h). Cd concentration was measured after 5, 10 and 15 days of Cd treatments. Data are mean ± SD (n = 5). * and ** denote significant difference at P < 0.05 and P < 0.01 between Zhenong8 and W6nk2 at each of the four Cd levels over 15 days