Fig. 2.

Citrate efflux from root apices. Citrate efflux from excised root apices of control lines and transgenic barley lines expressing SbMATE or FRD3 in the absence of Al³⁺ (A) and in the presence of 50 μM AlCl₃ (B). Black indicates the two wild-type controls, cv. Dayton (Al³⁺-resistant) and Golden Promise (Al³⁺-sensitive parental line); white indicates the two independent null segregant lines (T3) for the SbMATE and FRD3 transformation events; grey indicates the independent T3 transgenic lines expressing the transgenes. Data are mean and standard error (n= 3 or 4),