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Phloem iron remodels root development in response to ammonium as the major nitrogen source

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Listed:
  • Xing Xing Liu

    (Zhejiang University)

  • Hai Hua Zhang

    (Zhejiang University)

  • Qing Yang Zhu

    (Zhejiang University)

  • Jia Yuan Ye

    (Zhejiang University)

  • Ya Xin Zhu

    (Zhejiang University)

  • Xiang Ting Jing

    (Zhejiang University)

  • Wen Xin Du

    (Zhejiang University)

  • Miao Zhou

    (Zhejiang University)

  • Xian Yong Lin

    (Zhejiang University)

  • Shao Jian Zheng

    (Zhejiang University)

  • Chong Wei Jin

    (Zhejiang University)

Abstract

Plants use nitrate and ammonium as major nitrogen (N) sources, each affecting root development through different mechanisms. However, the exact signaling pathways involved in root development are poorly understood. Here, we show that, in Arabidopsis thaliana, either disruption of the cell wall-localized ferroxidase LPR2 or a decrease in iron supplementation efficiently alleviates the growth inhibition of primary roots in response to NH4+ as the N source. Further study revealed that, compared with nitrate, ammonium led to excess iron accumulation in the apoplast of phloem in an LPR2-dependent manner. Such an aberrant iron accumulation subsequently causes massive callose deposition in the phloem from a resulting burst of reactive oxygen species, which impairs the function of the phloem. Therefore, ammonium attenuates primary root development by insufficiently allocating sucrose to the growth zone. Our results link phloem iron to root morphology in response to environmental cues.

Suggested Citation

  • Xing Xing Liu & Hai Hua Zhang & Qing Yang Zhu & Jia Yuan Ye & Ya Xin Zhu & Xiang Ting Jing & Wen Xin Du & Miao Zhou & Xian Yong Lin & Shao Jian Zheng & Chong Wei Jin, 2022. "Phloem iron remodels root development in response to ammonium as the major nitrogen source," Nature Communications, Nature, vol. 13(1), pages 1-16, December.
  • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-28261-4
    DOI: 10.1038/s41467-022-28261-4
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    Cited by:

    1. Joaquín Clúa & Jonatan Montpetit & Pedro Jimenez-Sandoval & Christin Naumann & Julia Santiago & Yves Poirier, 2024. "A CYBDOM protein impacts iron homeostasis and primary root growth under phosphate deficiency in Arabidopsis," Nature Communications, Nature, vol. 15(1), pages 1-20, December.
    2. Rodolfo A. Maniero & Cristiana Picco & Anja Hartmann & Felipe Engelberger & Antonella Gradogna & Joachim Scholz-Starke & Michael Melzer & Georg Künze & Armando Carpaneto & Nicolaus Wirén & Ricardo F. , 2024. "Ferric reduction by a CYBDOM protein counteracts increased iron availability in root meristems induced by phosphorus deficiency," Nature Communications, Nature, vol. 15(1), pages 1-18, December.

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