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Host-specific competitiveness to form nodules in Rhizobium leguminosarum symbiovar viciae

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Authors
Boivin, Stephane
Lahmidi, Nassima Ait
Sherlock, David
Bonhomme, Maxime
Dijon, Doriane
Heulin-Gotty, Karine
Le-Quere, Antoine
Pervent, Marjorie
Tauzin, Marc
Carlsson, Georg
Jensen, Erik
Journet, Etienne-Pascal
Lopez-Bellido, Raphael
Seidenglanz, Marek
Marinković, Jelena
Colella, Stefano
Brunel, Brigitte
Young, Peter
Lepetit, Marc
article (publishedVersion)
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Abstract
Fabeae legumes such as pea and faba bean form symbiotic nodules with a large diversity of soil Rhizobium leguminosarum symbiovar viciae (Rlv) bacteria. However, bacteria competitive to form root nodules (CFN) are generally not the most efficient to fix dinitrogen, resulting in a decrease in legume crop yields. Here, we investigate differential selection by host plants on the diversity of Rlv. A large collection of Rlv was collected by nodule trapping with pea and faba bean from soils at five European sites. Representative genomes were sequenced. In parallel, diversity and abundance of Rlv were estimated directly in these soils using metabarcoding. The CFN of isolates was measured with both legume hosts. Pea/faba bean CFN were associated to Rlv genomic regions. Variations of bacterial pea and/or faba bean CFN explained the differential abundance of Rlv genotypes in pea and faba bean nodules. No evidence was found for genetic association between CFN and variations in the core genome, but... variations in specific regions of the nod locus, as well as in other plasmid loci, were associated with differences in CFN. These findings shed light on the genetic control of CFN in Rlv and emphasise the importance of host plants in controlling Rhizobium diversity.

Keywords:
competitiveness / genospecies / nod genes / nodules / Pisum sativum / Rhizobium leguminosarum symbiovar viciae / symbiosis / Vicia faba
Source:
New Phytologist, 2020, 226, 2, 555-568
Publisher:
  • Wiley, Hoboken
Funding / projects:
  • info:eu-repo/grantAgreement/EC/FP7/613551/EU// (EU-613551)
  • GrasP grant of the Agence Nationale de la RechercheFrench National Research Agency (ANR)

DOI: 10.1111/nph.16392

ISSN: 0028-646X

PubMed: 31873949

WoS: 000509624700001

Scopus: 2-s2.0-85078673270
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URI
http://fiver.ifvcns.rs/handle/123456789/1993
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