Probable transcription factor. Required for root plasticity in response to nitrate, NO(3)(-). Promotes lateral root growth in a NRT1.1-dependent manner. Interacts with AGL16, AGL21 and SOC1. Specifically expressed in roots, mostly in lateral roots (LR) primordia, young emerging LRs, apex and base of LRs, apex of the primary root, and in the stele. Barely detectable in shoots. Induced by nitrate in root cell culture, (PubMed:9430595, PubMed:17148611). In roots, seems induced by nitrogen (N) deprivation (e.g. nitrate free medium) but rapidly repressed by N re-supply (e.g. nitrate, glutamine and ammonium) (PubMed:16021502). Slight repression in shoots during nitrogen (N) deprivation. Impaired lateral root proliferation in nitrate rich root zones.