Figure 4.
Nothern blots of RNA isolated from seedlings treated in liquid medium with increasing concentrations of ZnSO4 for 6 and 24 h. Lanes C, Control seedlings (30 μm Zn already present in the medium); lanes 0.25, 0.50, and 1.00, seedlings with different millimolar concentrations of extra ZnSO4 added. Exposure was for 2 d at −70°C with an intensifying screen.