Fig. 2.

Schematic localization of the nitrate transporters involved in nitrate transport, nitrate efflux and homeostasis in the mature roots of Arabidopsis. The location of the NRT transporters from NRT1 and NRT2 families has been deduced from in situ hybridization and GUS and GFP activities from transformed seedlings with pNRT::GUS and pNRT::GFP or pCLC-b::GFP and pNAXT1::GFP constructs (from Guo et al., 2001, 2002; Nazoa et al., 2003; De Angeli et al., 2006; Remans et al., 2006a, b; Girin et al., 2007; Orsel et al., 2007; Chopin et al., 2007; Lin et al., 2008; Li et al., 2010; Von der Fecht-Bartenbach et al., 2010).