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Related Experiment Video

Updated: Jun 3, 2026

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

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

Published on: December 23, 2017

Function and evolution of nodulation genes in legumes.

Keisuke Yokota¹, Makoto Hayashi

¹National Institute of Agrobiological Sciences, 2-1-2 Kannondai, Tsukuba, Ibaraki, Japan. keisukey@affrc.go.jp

Cellular and Molecular Life Sciences : CMLS

|March 8, 2011

Summary

Root nodule symbiosis allows certain plants, like legumes, to fix atmospheric nitrogen using bacteria. Studying legume genes involved in this process may reveal how this unique symbiosis evolved.

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Generation of Composite Plants in Medicago truncatula used for Nodulation Assays

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Single-plant, Sterile Microcosms for Nodulation and Growth of the Legume Plant Medicago truncatula with the Rhizobial Symbiont Sinorhizobium meliloti

Single-plant, Sterile Microcosms for Nodulation and Growth of the Legume Plant Medicago truncatula with the Rhizobial Symbiont Sinorhizobium meliloti

Published on: October 1, 2013

Area of Science:

Plant biology
Microbiology
Evolutionary biology

Background:

Root nodule (RN) symbiosis is a unique biological interaction where bacteria fix atmospheric nitrogen.
This symbiosis is exclusive to a limited range of land plants, notably legumes.
The evolutionary origins of RN symbiosis remain largely unknown.

Purpose of the Study:

To investigate the evolutionary history of root nodule symbiosis.
To identify key legume genes involved in establishing RN symbiosis.
To provide insights into the mechanisms underlying the evolution of nitrogen fixation symbiosis.

Main Methods:

Comparative genomics of legume species.
Analysis of gene expression patterns during symbiosis establishment.
Phylogenetic analysis of symbiotic genes.

Main Results:

Identified several conserved legume genes essential for RN symbiosis.
Demonstrated the ancient origin of key symbiotic pathways in legumes.
Highlighted the role of gene duplication and neofunctionalization in the evolution of symbiosis.

Conclusions:

Recent findings on legume genes offer clues to the evolution of RN symbiosis.
Understanding these genes is crucial for deciphering the evolutionary trajectory of nitrogen fixation.
Further research into legume genetics can illuminate the origins of this vital plant-microbe interaction.