Figure 1.

Effects of exogenously supplied ZnSO₄ and FeSO₄ on chlorophyll content and root growth. A, Growth of wild-type seedlings on MS or 300-Zn medium supplemented with 100, 200, 300, 400, 500, or 0 μm FeSO₄. B and C, Chlorophyll content (B) and root length (C) of 10-d-old seedlings grown on MS medium (black circles) and 300-Zn medium (black triangles) in A were measured. F.W., Fresh weight. Data are means ± sd of three independent experiments. Ten seedlings were grown in each experiment at different times. * P < 0.05, ** P < 0.001, significantly different from the data on MS medium.