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The NMN Module Conducts Nodule Number Orchestra.

Zhijuan Wang1, Lixiang Wang2, Yongliang Wang1

  • 1State Key Laboratory of Agricultural Microbiology, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, Hubei 430070, P.R. China.

Iscience
|January 25, 2020
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Summary

Legume nodule formation is regulated by the GmNINa-miR172c-NNC1 module, which balances nodulation and autoregulation of nodulation (AON) pathways for optimal root nodule numbers.

Keywords:
Interaction of Plants with OrganismsPlant BiologyPlant Genetics

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Area of Science:

  • Plant molecular biology
  • Legume symbiosis
  • Nitrogen fixation

Background:

  • Legumes control root nodule numbers via nodulation and autoregulation of nodulation (AON) pathways.
  • Nodule Inception (NIN) is crucial for rhizobial infection and nodule development in legumes.

Purpose of the Study:

  • To elucidate the function of the GmNINa-miR172c-NNC1 (NMN) module in integrating nodulation and AON pathways.
  • To understand how the NMN module regulates nodule number in legumes.

Main Methods:

  • Molecular cloning and gene expression analysis
  • Analysis of regulatory interactions within the NMN module
  • Investigating the interplay between nodulation and AON signaling

Main Results:

  • The NMN module, comprising GmNINa, miR172c, and NNC1, integrates nodulation and AON.
  • GmNINa activates miR172c, suppressing NNC1 to promote nodulation, while NNC1 inhibits miR172c, creating a negative feedback loop.
  • The NMN module fine-tunes GmRIC1/RIC2 expression to control AON, acting as both an accelerator for nodulation and a brake via AON.

Conclusions:

  • The NMN module acts as a critical regulatory hub, balancing positive and negative feedback loops to control nodule number in legumes.
  • This intricate regulation ensures efficient nitrogen fixation by orchestrating the balance between nodulation and autoregulation.