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f Genetic diversity and symbiotic effectiveness of Bradyrhizobium strains nodulating selected annual grain legumes growing in Ethiopia

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  • Authors: Tulu Degefu1​ ,  Endalkachew Wolde-meskel2​ , Frank Rasche3​
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    • 1​ 1​School of Applied Natural Sciences, Applied Biology Program, Adama Science and Technology University, P.O. Box 1888, Adama, Ethiopia 2​ 2​International Livestock Research Institute, P.O. Box 5689, Addis Ababa, Ethiopia 3​ 3​Institute of Agricultural Sciences in the Tropics (Hans-Ruthenberg-Institute), University of Hohenheim, 70593 Stuttgart, Germany
  • *Correspondence: Tulu Degefu [email protected]
  • First Published Online: 16 November 2017, International Journal of Systematic and Evolutionary Microbiology 68: 449-460, doi: 10.1099/ijsem.0.002486
  • Subject: Evolution, Phylogeny and Biodiversity
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Genetic diversity and symbiotic effectiveness of Bradyrhizobium strains nodulating selected annual grain legumes growing in Ethiopia, Page 1 of 1

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  • Vigna unguiculata, Vigna radiata and Arachis hypogaea growing in Ethiopia are nodulated by a genetically diverse group of Bradyrhizobium strains. To determine the genetic identity and symbiotic effectiveness of these bacteria, a collection of 36 test strains originating from the root nodules of the three hosts was investigated using multilocus sequence analyses (MLSA) of core genes including 16S rRNA, recA, glnII, gyrB, atpD and dnaK. Sequence analysis of nodA and nifH genes along with tests for symbiotic effectiveness using δN analysis were also carried out. The phylogenetic trees derived from the MLSA grouped most test strains into four well-supported distinct positions designated as genospecies I–IV. The maximum likelihood (ML) tree that was constructed based on the nodA gene sequences separated the entire test strains into two lineages, where the majority of the test strains were clustered on one of a well-supported large branch that comprise Bradyrhizobium species from the tropics. This clearly suggested the monophyletic origin of the nodA genes within the bradyrhizobia of tropical origin. The δN-based symbiotic effectiveness test of seven selected strains revealed that strains GN100 (δ N=0.73) and GN102 (δ N=0.79) were highly effective nitrogen fixers when inoculated to cowpea, thus can be considered as inoculants in cowpea production. It was concluded that Ethiopian soils are a hotspot for rhizobial diversity. This calls for further research to unravel as yet unknown bradyrhizobia nodulating legume host species growing in the country. In this respect, prospective research should also address the mechanisms of symbiotic specificity that could lead to high nitrogen fixation in target legumes.

  • Two supplementary figures are available with the online version of this article.

© 2018 IUMS | Published by the Microbiology Society

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