CHL1 functions as a nitrate sensor in plants.

By Cheng-Hsun Ho, Shanshan Lin, H. Hu, Y. Tsay. Cell, 2009

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Plant abiotic stress response and nutrient use efficiency (2020, background): “1 and then a low N response is mediated by the central transcription factor NINlike Protein 7 (AtNLP7) (Ho et al., 2009), who activates gene expression by binding to nitrate-responsive cis-elements.”
Calcium Signals: The Lead Currency of Plant Information Processing (2010, background): “1 gene (Ho et al., 2009).”
Signaling network in sensing phosphate availability in plants. (2011, background): “1 nitrate transporter in Arabidopsis and the PHO84 Pi transporter in yeast as “transceptors” that sense external nitrate and Pi conditions, respectively (38, 45), points out that external sensing of Pi in plants cannot be ruled out.”
Abscisic acid and the control of seed dormancy and germination (2010, background): “Recently, Ho et al. (2009) reported that the nitrate transporter CHL1 acts as a sensor in the Arabidopsis nitrate response.”