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

Ryosuke Ota, Yuri Ohkubo, Yasuko Yamashita, Mari Ogawa-Ohnishi and Yoshikatsu Matsubayashi ()
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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

Nature Communications, 2020, vol. 11, issue 1, 1-9

Abstract: 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.

Date: 2020
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DOI: 10.1038/s41467-020-14440-8

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