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Nat Plants. 2019 Apr;5(4):401-413. doi: 10.1038/s41477-019-0384-1. Epub 2019 Mar 25.

Nitrate-NRT1.1B-SPX4 cascade integrates nitrogen and phosphorus signalling networks in plants.

Author information

1
State Key Laboratory of Plant Genomics, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, China. bhu@genetics.ac.cn.
2
State Key Laboratory of Plant Genomics, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, China.
3
College of Life Sciences, University of Chinese Academy of Sciences, Beijing, China.
4
Biogle Genome Editing Center, Changzhou, China.
5
State Key Laboratory of Molecular Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, China.
6
School of Agriculture, Henan University of Science and Technology, Luoyang, China.
7
Botanical Institute, Cluster of Excellence on Plant Sciences, University of Cologne, Cologne, Germany.
8
State Key Laboratory of Plant Genomics, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, China. ccchu@genetics.ac.cn.
9
College of Life Sciences, University of Chinese Academy of Sciences, Beijing, China. ccchu@genetics.ac.cn.

Abstract

To ensure high crop yields in a sustainable manner, a comprehensive understanding of the control of nutrient acquisition is required. In particular, the signalling networks controlling the coordinated utilization of the two most highly demanded mineral nutrients, nitrogen and phosphorus, are of utmost importance. Here, we reveal a mechanism by which nitrate activates both phosphate and nitrate utilization in rice (Oryza sativa L.). We show that the nitrate sensor NRT1.1B interacts with a phosphate signalling repressor SPX4. Nitrate perception strengthens the NRT1.1B-SPX4 interaction and promotes the ubiquitination and degradation of SPX4 by recruiting NRT1.1B interacting protein 1 (NBIP1), an E3 ubiquitin ligase. This in turn allows the key transcription factor of phosphate signalling, PHR2, to translocate to the nucleus and initiate the transcription of phosphorus utilization genes. Interestingly, the central transcription factor of nitrate signalling, NLP3, is also under the control of SPX4. Thus, nitrate-triggered degradation of SPX4 activates both phosphate- and nitrate-responsive genes, implementing the coordinated utilization of nitrogen and phosphorus.

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PMID:
30911122
DOI:
10.1038/s41477-019-0384-1

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