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Modern Molecular Taxonomy01:29

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Advancements in molecular biology have revolutionized the identification and characterization of bacteria, with multiple methods leveraging DNA sequencing for enhanced precision. As sequencing technologies improve and costs decline, these approaches are increasingly used in clinical, environmental, and evolutionary studies.Multilocus Sequence Typing (MLST) examines several housekeeping genes, essential chromosomal genes encoding cellular functions, to distinguish strains. Approximately...
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Single-plant, Sterile Microcosms for Nodulation and Growth of the Legume Plant Medicago truncatula with the Rhizobial Symbiont Sinorhizobium meliloti
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Multilocus sequence analysis reveals multiple symbiovars within Mesorhizobium species.

Marta Laranjo1, J Peter W Young, Solange Oliveira

  • 1Laboratório de Microbiologia do Solo-ICAAM (Instituto de Ciências Agrárias e Ambientais Mediterrânicas), Universidade de Évora, Évora, Portugal.

Systematic and Applied Microbiology
|July 24, 2012
PubMed
Summary

Researchers identified a new Mesorhizobium genospecies and symbiovar, ciceri, that nodulates chickpea. This finding expands our understanding of chickpea rhizobia diversity and their presence across multiple Mesorhizobium species.

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Exploring the Root Microbiome: Extracting Bacterial Community Data from the Soil, Rhizosphere, and Root Endosphere
09:55

Exploring the Root Microbiome: Extracting Bacterial Community Data from the Soil, Rhizosphere, and Root Endosphere

Published on: May 2, 2018

Area of Science:

  • Microbiology
  • Plant Science
  • Genetics

Background:

  • The genus Mesorhizobium contains species that form symbiotic relationships with legumes, including chickpea, a crop of significant agricultural value.
  • Previously, chickpea-nodulating rhizobia were classified as Mesorhizobium ciceri or Mesorhizobium mediterraneum, but further research indicated broader species diversity within Mesorhizobium.

Purpose of the Study:

  • To perform a high-resolution phylogenetic analysis of the Mesorhizobium genus using multilocus sequence analysis.
  • To confirm the existence of a novel chickpea-nodulating genospecies and a new symbiovar within Mesorhizobium.

Main Methods:

  • Utilized multilocus sequence analysis (MLSA) with core genes (atpD, dnaJ, glnA, gyrB, recA), the 16S rRNA gene, and the ITS region to construct phylogenies.
  • Compared phylogenetic analyses of core genes with the symbiosis gene nodC.

Main Results:

  • A well-resolved phylogenetic tree was obtained using combined sequence data, supporting the existence of a new chickpea-nodulating Mesorhizobium genospecies.
  • Identified a new symbiovar, Mesorhizobium opportunistum sv. ciceri, which is distributed across six different Mesorhizobium species.
  • Demonstrated that the symbiovar ciceri is not confined to a single species but is present in multiple Mesorhizobium species.

Conclusions:

  • The study confirms a new Mesorhizobium genospecies and symbiovar (ciceri) associated with chickpea root nodulation.
  • Highlights the extensive genetic diversity within Mesorhizobium and the ability of a single symbiovar to colonize multiple host species.
  • Provides the most comprehensive Mesorhizobium multilocus phylogeny to date, enhancing the understanding of symbiovar evolution and distribution.