Nitrate signalling mediated by the NRT1.1 nitrate transporter antagonises l‐glutamate‐induced changes in root architecture

Summary Arabidopsis root architecture is highly responsive to changes in the nitrogen supply. External NO 3 − stimulates lateral root growth via a signalling pathway involving the ANR1 MADS box transcription factor, while the presence of exogenous l ‐glutamate (Glu) at the primary root tip slows primary root growth and stimulates root branching. We have found that NO 3 − , in conjunction with Glu, has a hitherto unrecognized role in regulating...