ArticleProceedings. Biological sciences2016
Metapopulation dominance and genomic-island acquisition of Bradyrhizobium with superior catabolic capabilities.
Article in Proceedings. Biological sciences, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 10 papers.
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Who cites it
10 citing papers in PubMed, 25 citations in OpenAlex.
- Host-Associated Rhizobial Fitness: Dependence on Nitrogen, Density, Community Complexity, and Legume Genotype.Applied and environmental microbiology · 2022Article
- Article
- Phylogeographic distribution of rhizobia nodulating common bean (Phaseolus vulgaris L.) in Ethiopia.FEMS microbiology ecology · 2021Article
- Recurrent mutualism breakdown events in a legume rhizobia metapopulation.Proceedings. Biological sciences · 2020Article
- Dynamic genomic architecture of mutualistic cooperation in a wild population of Mesorhizobium.The ISME journal · 2019Article
- Soybean-Nodulating Strains With Low Intrinsic Competitiveness for Nodulation, Good Symbiotic Performance, and Stress-Tolerance Isolated From Soybean-Cropped Soils in Argentina.Frontiers in microbiology · 2019Article
- Widespread Distribution of Highly AdaptedFrontiers in microbiology · 2019Review
- Phylogeny and Phylogeography of Rhizobial Symbionts Nodulating Legumes of the Tribe Genisteae.Genes · 2018Review
- Select and resequence reveals relative fitness of bacteria in symbiotic and free-living environments.Proceedings of the National Academy of Sciences of the United States of America · 2018Article
- Diversity of Bradyrhizobia in Subsahara Africa: A Rich Resource.Frontiers in microbiology · 2018Review
Corrections and comments
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Authors and funding
9 authors at 2 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Root nodule-forming rhizobia exhibit a bipartite lifestyle, replicating in soil and also within plant cells where they fix nitrogen for legume hosts. Host control models posit that legume hosts act as a predominant selective force on rhizobia, but few studies have examined rhizobial fitness in natural populations. Here, we genotyped and phenotyped Bradyrhizobium isolates across more than 800 km of the native Acmispon strigosus host range. We sequenced chromosomal genes expressed under free-living conditions and accessory symbiosis loci expressed in planta and encoded on an integrated 'symbiosis island' (SI). We uncovered a massive clonal expansion restricted to the Bradyrhizobium chromosome, with a single chromosomal haplotype dominating populations, ranging more than 700 km, and acquiring 42 divergent SI haplotypes, none of which were spatially widespread. For focal genotypes, we quantified utilization of 190 sole-carbon sources relevant to soil fitness. Chromosomal haplotypes that were both widespread and dominant exhibited superior growth on diverse carbon sources, whereas these patterns were not mirrored among SI haplotypes. Abundance, spatial range and catabolic superiority of chromosomal, but not symbiosis genotypes suggests that fitness in the soil environment, rather than symbiosis with hosts, might be the key driver of Bradyrhizobium dominance.
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