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Shoot-to-root mobile CEPD-like 2 integrates shoot nitrogen status to systemically regulate nitrate uptake in Arabidopsis

Author

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  • Ryosuke Ota

    (Graduate School of Science, Nagoya University, Chikusa)

  • Yuri Ohkubo

    (Graduate School of Science, Nagoya University, Chikusa)

  • Yasuko Yamashita

    (Graduate School of Science, Nagoya University, Chikusa)

  • Mari Ogawa-Ohnishi

    (Graduate School of Science, Nagoya University, Chikusa)

  • Yoshikatsu Matsubayashi

    (Graduate School of Science, Nagoya University, Chikusa)

Abstract

Plants modulate the efficiency of root nitrogen (N) acquisition in response to shoot N demand. However, molecular components directly involved in this shoot-to-root communication remain to be identified. Here, we show that phloem-mobile CEPD-like 2 (CEPDL2) polypeptide is upregulated in the leaf vasculature in response to decreased shoot N status and, after translocation to the roots, promotes high-affinity uptake and root-to-shoot transport of nitrate. Loss of CEPDL2 leads to a reduction in shoot nitrate content and plant biomass. CEPDL2 contributes to N acquisition cooperatively with CEPD1 and CEPD2 which mediate root N status, and the complete loss of all three proteins severely impairs N homeostasis in plants. Reciprocal grafting analysis provides conclusive evidence that the shoot CEPDL2/CEPD1/2 genotype defines the high-affinity nitrate uptake activity in root. Our results indicate that plants integrate shoot N status and root N status in leaves and systemically regulate the efficiency of root N acquisition.

Suggested Citation

  • Ryosuke Ota & Yuri Ohkubo & Yasuko Yamashita & Mari Ogawa-Ohnishi & Yoshikatsu Matsubayashi, 2020. "Shoot-to-root mobile CEPD-like 2 integrates shoot nitrogen status to systemically regulate nitrate uptake in Arabidopsis," Nature Communications, Nature, vol. 11(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-14440-8
    DOI: 10.1038/s41467-020-14440-8
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    Cited by:

    1. Moritz Sexauer & Hemal Bhasin & Maria Schön & Elena Roitsch & Caroline Wall & Ulrike Herzog & Katharina Markmann, 2023. "A micro RNA mediates shoot control of root branching," Nature Communications, Nature, vol. 14(1), pages 1-9, December.
    2. Ryutaro Kobayashi & Yuri Ohkubo & Mai Izumi & Ryosuke Ota & Keiko Yamada & Yoko Hayashi & Yasuko Yamashita & Saki Noda & Mari Ogawa-Ohnishi & Yoshikatsu Matsubayashi, 2024. "Integration of shoot-derived polypeptide signals by root TGA transcription factors is essential for survival under fluctuating nitrogen environments," Nature Communications, Nature, vol. 15(1), pages 1-12, December.

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