PHR1 negatively regulates nitrate reductase activity by directly inhibiting the transcription of NIA1 in Arabidopsis
Copyright © 2024 Elsevier GmbH. All rights reserved.
| Publié dans: | Journal of plant physiology. - 1979. - 303(2024) vom: 16. Dez., Seite 154382 |
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| Auteur principal: | |
| Autres auteurs: | , , , , , , |
| Format: | Article en ligne |
| Langue: | English |
| Publié: |
2024
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| Accès à la collection: | Journal of plant physiology |
| Sujets: | Journal Article Arabidopsis NIA1 Nitrate reductase P1BS motif PHR1 Transcriptional regulation Arabidopsis Proteins Nitrate Reductase EC 1.7.99.4 plus... |
| Résumé: | Copyright © 2024 Elsevier GmbH. All rights reserved. Nitrogen (N) and phosphorus (P), as indispensable mineral elements, both play pivotal roles in plant growth and development. Despite the intimate association between nitrate signaling and inorganic phosphate (Pi) signaling, the regulatory function of Pi in N metabolism remains poorly understood. In this study, we observed that Pi deficiency leads to a reduction in the activity of nitrate reductase (NR), an essential enzyme involved in N metabolism. Furthermore, PHOSPHATE STARVATION RESPONSE 1 (PHR1), a key regulator of Pi signaling, exerts a negative impact on both NR activity and the expression of its coding gene NIA1. Importantly, our analysis utilizing yeast one-hybrid (Y1H) and electrophoretic mobility shift assay (EMSA) techniques reveals the direct binding of PHR1 to the NIA1 promoter via the P1BS motifs. Subsequent transient transcription expression assay (TTEA) demonstrates PHR1 as a transcriptional suppressor of NIA1. In addition, it was also observed that the SPX (SYG1/Pho81/XPR1) proteins SPX1 and SPX4 can attenuate the transcriptional inhibition of NIA1 by PHR1. Collectively, these findings reveal a mechanism through which PHR1-mediated Pi signal governs N metabolism, thus offering evidence for the precise modulation of plant growth and development via N-P interaction |
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| Description: | Date Completed 01.12.2024 Date Revised 01.12.2024 published: Print-Electronic Citation Status MEDLINE |
| ISSN: | 1618-1328 |
| DOI: | 10.1016/j.jplph.2024.154382 |