Journal
PLANT CELL
Volume 32, Issue 11, Pages 3519-3534Publisher
OXFORD UNIV PRESS INC
DOI: 10.1105/tpc.20.00361
Keywords
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Funding
- Ministry of Agriculture of China [2016ZX08009002]
- National Key Research and Development Program of China [2016YFD0100707]
- National Natural Science Foundation of China [31970273, 31670245, 31921001]
- Chinese Universities Scientific Fund [2020TC153]
- Beijing Outstanding University Discipline Program
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Phosphorus and nitrogen are essential macronutrients for plant growth and crop production. During phosphate (Pi) starvation, plants enhanced Pi but reduced nitrate (NO3-) uptake capacity, and the mechanism is unclear. Here, we show that a GARP-type transcription factor NITRATE-INDUCIBLE, GARP-TYPE TRANSCRIPTIOANL REPRESSOR1.2 (NIGT1.2) coordinately modulates Pi and NO3- uptake in response to Pi starvation. Overexpression of NIGT1.2 increased Pi uptake capacity but decreased NO3- uptake capacity in Arabidopsis (Arabidopsis thaliana). Furthermore, the nigt1.1 nigt1.2 double mutant displayed reduced Pi uptake but enhanced NO3- uptake under low-Pi stress. During Pi starvation, NIGT1.2 directly up-regulated the transcription of the Pi transporter genes PHOSPHATE TRANSPORTER1;1 (PHT1;1) and PHOSPHATE TRANSPORTER1;4 (PHT1;4) and down-regulated expression of NO3- transporter gene NITRATE TRANSPORTER1.1 (NRT1.1) by binding to cis-elements in their promoters. Further genetic assays demonstrated that PHT1;1, PHT1;4, and NRT1.1 were genetically epistatic to NIGT1.2. We also identified similar regulatory pathway in maize (Zea mays). These data demonstrate that the transcription factor NIGT1.2 plays a central role in modulating low-Pi-dependent uptake of Pi and NO3-, tending toward maintenance of the phosphorus to nitrogen balance in plants during Pi starvation. NIGT1.2 plays an important role in modulating low-Pi-dependent uptake of phosphate and nitrate, tending towards maintenance of the phosphorus to nitrogen balance in plants during Pi starvation.
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