Shoot-to-root Mobile CEPD-like 2 Integrates Shoot Nitrogen Status to Systemically Regulate Nitrate Uptake in Arabidopsis

Overview

Journal Nat Commun

Specialty Biology

Date 2020 Feb 2

PMID 32005881

Citations 55

Authors

Ryosuke Ota

Yuri Ohkubo

Yasuko Yamashita

Mari Ogawa-Ohnishi

Yoshikatsu Matsubayashi

Affiliations

Soon will be listed here.

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.

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