IMA peptides regulate root nodulation and nitrogen homeostasis by providing iron according to internal nitrogen status

Momoyo Ito, Yuri Tajima, Mari Ogawa-Ohnishi, Hanna Nishida, Shohei Nosaki, Momona Noda, Naoyuki Sotta, Kensuke Kawade, Takehiro Kamiya, Toru Fujiwara, Yoshikatsu Matsubayashi and Takuya Suzaki ()
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Momoyo Ito: University of Tsukuba
Yuri Tajima: University of Tsukuba
Mari Ogawa-Ohnishi: Nagoya University
Hanna Nishida: National Agriculture and Food Research Organization
Shohei Nosaki: University of Tsukuba
Momona Noda: University of Tsukuba
Naoyuki Sotta: The University of Tokyo
Kensuke Kawade: National Institute for Basic Biology
Takehiro Kamiya: The University of Tokyo
Toru Fujiwara: The University of Tokyo
Yoshikatsu Matsubayashi: Nagoya University
Takuya Suzaki: University of Tsukuba

Nature Communications, 2024, vol. 15, issue 1, 1-13

Abstract: Abstract Legumes control root nodule symbiosis (RNS) in response to environmental nitrogen availability. Despite the recent understanding of the molecular basis of external nitrate-mediated control of RNS, it remains mostly elusive how plants regulate physiological processes depending on internal nitrogen status. In addition, iron (Fe) acts as an essential element that enables symbiotic nitrogen fixation; however, the mechanism of Fe accumulation in nodules is poorly understood. Here, we focus on the transcriptome in response to internal nitrogen status during RNS in Lotus japonicus and identify that IRON MAN (IMA) peptide genes are expressed during symbiotic nitrogen fixation. We show that LjIMA1 and LjIMA2 expressed in the shoot and root play systemic and local roles in concentrating internal Fe to the nodule. Furthermore, IMA peptides have conserved roles in regulating nitrogen homeostasis by adjusting nitrogen-Fe balance in L. japonicus and Arabidopsis thaliana. These findings indicate that IMA-mediated Fe provision plays an essential role in regulating nitrogen-related physiological processes.

Date: 2024
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DOI: 10.1038/s41467-024-44865-4

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