The nitrate transporter NRT2.1 directly antagonizes PIN7-mediated auxin transport for root growth adaptation
Wang Y, Yuan Z, Wang J, Xiao H, Wan L, Li L, Guo Y, Gong Z, Friml J, Zhang J. 2023. The nitrate transporter NRT2.1 directly antagonizes PIN7-mediated auxin transport for root growth adaptation. Proceedings of the National Academy of Sciences of the United States of America. 120(25), e2221313120.
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Author
Wang, Yalu;
Yuan, Zhi;
Wang, Jinyi;
Xiao, Huixin;
Wan, Lu;
Li, LanxinISTA ;
Guo, Yan;
Gong, Zhizhong;
Friml, JiríISTA ;
Zhang, Jing
Department
Abstract
As a crucial nitrogen source, nitrate (NO3−) is a key nutrient for plants. Accordingly, root systems adapt to maximize NO3− availability, a developmental regulation also involving the phytohormone auxin. Nonetheless, the molecular mechanisms underlying this regulation remain poorly understood. Here, we identify low-nitrate-resistant mutant (lonr) in Arabidopsis (Arabidopsis thaliana), whose root growth fails to adapt to low-NO3− conditions. lonr2 is defective in the high-affinity NO3− transporter NRT2.1. lonr2 (nrt2.1) mutants exhibit defects in polar auxin transport, and their low-NO3−-induced root phenotype depends on the PIN7 auxin exporter activity. NRT2.1 directly associates with PIN7 and antagonizes PIN7-mediated auxin efflux depending on NO3− levels. These results reveal a mechanism by which NRT2.1 in response to NO3− limitation directly regulates auxin transport activity and, thus, root growth. This adaptive mechanism contributes to the root developmental plasticity to help plants cope with changes in NO3− availability.
Publishing Year
Date Published
2023-06-12
Journal Title
Proceedings of the National Academy of Sciences of the United States of America
Acknowledgement
We are grateful to Caifu Jiang for providing ethyl metha-nesulfonate- mutagenized population, Yi Wang for providing Xenopus oocytes, Jun Fan and Zhaosheng Kong for providing tobacco BY- 2 cells, and Claus Schwechheimer, Alain Gojon, and Shutang Tan for helpful discussions. This work was supported by the National Key Research and Development Program of China (2021YFF1000500), the National Natural Science Foundation of China (32170265 and 32022007), Hainan Provincial Natural Science Foundation of China (323CXTD379), Chinese Universities Scientific Fund (2023TC019), Beijing Municipal Natural Science Foundation (5192011), Beijing Outstanding University Discipline Program, and China Postdoctoral Science Foundation (BH2020259460).
Volume
120
Issue
25
Article Number
e2221313120
ISSN
eISSN
IST-REx-ID
Cite this
Wang Y, Yuan Z, Wang J, et al. The nitrate transporter NRT2.1 directly antagonizes PIN7-mediated auxin transport for root growth adaptation. Proceedings of the National Academy of Sciences of the United States of America. 2023;120(25). doi:10.1073/pnas.2221313120
Wang, Y., Yuan, Z., Wang, J., Xiao, H., Wan, L., Li, L., … Zhang, J. (2023). The nitrate transporter NRT2.1 directly antagonizes PIN7-mediated auxin transport for root growth adaptation. Proceedings of the National Academy of Sciences of the United States of America. National Academy of Sciences. https://doi.org/10.1073/pnas.2221313120
Wang, Yalu, Zhi Yuan, Jinyi Wang, Huixin Xiao, Lu Wan, Lanxin Li, Yan Guo, Zhizhong Gong, Jiří Friml, and Jing Zhang. “The Nitrate Transporter NRT2.1 Directly Antagonizes PIN7-Mediated Auxin Transport for Root Growth Adaptation.” Proceedings of the National Academy of Sciences of the United States of America. National Academy of Sciences, 2023. https://doi.org/10.1073/pnas.2221313120.
Y. Wang et al., “The nitrate transporter NRT2.1 directly antagonizes PIN7-mediated auxin transport for root growth adaptation,” Proceedings of the National Academy of Sciences of the United States of America, vol. 120, no. 25. National Academy of Sciences, 2023.
Wang Y, Yuan Z, Wang J, Xiao H, Wan L, Li L, Guo Y, Gong Z, Friml J, Zhang J. 2023. The nitrate transporter NRT2.1 directly antagonizes PIN7-mediated auxin transport for root growth adaptation. Proceedings of the National Academy of Sciences of the United States of America. 120(25), e2221313120.
Wang, Yalu, et al. “The Nitrate Transporter NRT2.1 Directly Antagonizes PIN7-Mediated Auxin Transport for Root Growth Adaptation.” Proceedings of the National Academy of Sciences of the United States of America, vol. 120, no. 25, e2221313120, National Academy of Sciences, 2023, doi:10.1073/pnas.2221313120.
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