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Plant Promoter Analysis: Identification and Characterization of Root Nodule Specific Promoter in the Common Bean

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Published on: December 23, 2017

Shoot-derived miR2111 controls legume root and nodule development.

Mengbai Zhang¹, Huanan Su^1,2, Peter M Gresshoff¹

¹Integrative Legume Research Group, School of Agriculture and Food Sciences, The University of Queensland, St. Lucia, Brisbane, Queensland, Australia.

Plant, Cell & Environment

|January 2, 2021

Summary

Soybean autoregulation of nodulation (AON) involves miR2111, a shoot-derived signal regulating root nodule development. This microRNA targets TML, influencing nodule organogenesis and root architecture.

Keywords:

autoregulation of nodulation (AON)lateral root development legume-rhizobia symbiosis microRNA nodulation nodule number systemic signal

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Published on: October 1, 2013

Area of Science:

Plant Molecular Biology
Plant Physiology
Genetics and Genomics

Background:

Legumes regulate symbiotic nodule formation via autoregulation of nodulation (AON).
Rhizobia infection triggers root-derived CLE peptides that signal to the shoot.
The shoot-derived signal mediating this AON response remained largely uncharacterized.

Purpose of the Study:

To identify the shoot-derived mobile signal in soybean autoregulation of nodulation (AON).
To elucidate the molecular mechanism by which this signal regulates nodule development.
To investigate the role of this signal in shaping root system architecture.

Main Methods:

Utilized soybean as a model system for studying nodulation.
Employed microRNA (miR2111) and target transcript (TML) analysis.
Applied exogenous miR2111 feeding, gene overexpression, and target mimicry techniques.
Assessed effects on nodule organogenesis and root system architecture.

Main Results:

Identified miR2111 as the shoot-derived signal mediating AON in soybean.
Demonstrated that miR2111 targets Too Much Love (TML), a negative regulator of nodulation.
Showed that miR2111 positively regulates nodule development and influences root architecture.

Conclusions:

miR2111 is the critical shoot-to-root mobile signal for legume nodulation control.
miR2111 plays a dual role, regulating both symbiotic nodule development and root system architecture.
Findings provide new insights into plant hormone signaling and legume-microbe interactions.