Epidemic Spread of Symbiotic and Non-Symbiotic Bradyrhizobium Genotypes Across California
Autor: | D. Centeno, Seema Patel, A. Bernardo, John U. Regus, G. Lopez, D. Moore, J. Y. Lyu, Anita Patil, Kelsey A. Gano, J. Pham, Roxanne M. Bantay, Y. Lii, Joel L. Sachs, Amanda C. Hollowell |
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Rok vydání: | 2016 |
Předmět: |
0301 basic medicine
Root nodule Genomic Islands Genotype Evolution Population genetics Population Soil Science Acmispon strigosus Epidemic Rhizobia Bradyrhizobium Microbiology California 03 medical and health sciences Symbiosis Phylogenetics education Ecology Evolution Behavior and Systematics Phylogeny Genetics education.field_of_study Phylogenetic tree biology Ecology food and beverages Fabaceae Plant biology.organism_classification 030104 developmental biology Soil Sciences Root Nodules Root Nodules Plant |
Zdroj: | Microbial ecology, vol 71, iss 3 Hollowell, AC; Regus, JU; Gano, KA; Bantay, R; Centeno, D; Pham, J; et al.(2015). Epidemic Spread of Symbiotic and Non-Symbiotic Bradyrhizobium Genotypes Across California. Microbial Ecology. doi: 10.1007/s00248-015-0685-5. UC Riverside: Retrieved from: http://www.escholarship.org/uc/item/05g090tf |
Popis: | © 2015 Springer Science+Business Media New York The patterns and drivers of bacterial strain dominance remain poorly understood in natural populations. Here, we cultured 1292 Bradyrhizobium isolates from symbiotic root nodules and the soil root interface of the host plant Acmispon strigosus across a >840-km transect in California. To investigate epidemiology and the potential role of accessory loci as epidemic drivers, isolates were genotyped at two chromosomal loci and were assayed for presence or absence of accessory “symbiosis island” loci that encode capacity to form nodules on hosts. We found that Bradyrhizobium populations were very diverse but dominated by few haplotypes—with a single “epidemic” haplotype constituting nearly 30 % of collected isolates and spreading nearly statewide. In many Bradyrhizobium lineages, we inferred presence and absence of the symbiosis island suggesting recurrent evolutionary gain and or loss of symbiotic capacity. We did not find statistical phylogenetic evidence that the symbiosis island acquisition promotes strain dominance and both symbiotic and non-symbiotic strains exhibited population dominance and spatial spread. Our dataset reveals that a strikingly few Bradyrhizobium genotypes can rapidly spread to dominate a landscape and suggests that these epidemics are not driven by the acquisition of accessory loci as occurs in key human pathogens. |
Databáze: | OpenAIRE |
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