Transcription factor involved in regulation of nitrate assimilation and in transduction of the nitrate signal. Interacts with NRG2. Expressed in roots, stems, leaves, flowers and siliques. Detected in root hairs, emerging secondary roots, vascular tissues, leaf parenchyma cells and stomata. Not regulated by the N source or by nitrate. N-starvation phenotype. Smaller rosette, but no effects on roots. Delayed growth and flowering when grown in greenhouse. Increased drought resistance.