Figure 7. The effect of ammonium on primary roots growth in aux1-7 and eir1-1 mutants.

(A) to (C), Primary root growth rates for (A) wild type, (B) aux1-7, and (C) eir1-1. Plants were treated as in Figure 1A. Data represent means ± SE (n = 4) from four replicate plates, with 4 seedlings each. (D) Relative primary root growth rates for the indicated genotypes. The data of root growth rates were re-plotted as a percent of plants treated with 1 mM nitrate respectively.