1887

Abstract

Bacteria belonging to the genus are capable of establishing symbiotic relationships with a broad range of plants belonging to the three subfamilies of the family Leguminosae ( = Fabaceae), with the formation of specialized structures on the roots called nodules, where fixation of atmospheric nitrogen takes place. Symbiosis is under the control of finely tuned expression of common and host-specific nodulation genes and also of genes related to the assembly and activity of the nitrogenase, which, in strains investigated so far, are clustered in a symbiotic island. Information about the diversity of these genes is essential to improve our current poor understanding of their origin, spread and maintenance and, in this study, we provide information on 40 strains, mostly of tropical origin. For the nodulation trait, common (), -specific () and host-specific () nodulation genes were studied, whereas for fixation ability, the diversity of was investigated. In general, clustering of strains in all and trees was similar and the group could be clearly separated from other rhizobial genera. However, the congruence of and genes with ribosomal and housekeeping genes was low. and were not detected in three strains by amplification or hybridization with probes using and type strains, indicating the high diversity of these genes or that strains other than photosynthetic must have alternative mechanisms to initiate the process of nodulation. For a large group of strains, the high diversity of genes (with an emphasis on ), the low relationship between genes and the host legume, and some evidence of horizontal gene transfer might indicate strategies to increase host range. On the other hand, in a group of five symbionts of , the high congruence between and ribosomal/housekeeping genes, in addition to shorter sequences and the absence of , highlights a co-evolution process. Additionally, in a group of strains that were symbionts of soybean, vertical transfer seemed to represent the main genetic event. In conclusion, clustering of and gives additional support to the theory of monophyletic origin of the symbiotic genes in and, in addition to the analysis of and , indicates spread and maintenance of and genes through both vertical and horizontal transmission, apparently with the dominance of one or other of these events in some groups of strains.

Funding
This study was supported by the:
  • CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico, Brazil
  • CNPq-PNPD (Award 558455/2008-5)
  • CNPq/MCT/MAPA (Award 577933/2008)
  • CPNq-Universal (Award 470162/2009)
  • CNPq-Repensa (Award 562008/2010-1)
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2011-12-01
2024-04-19
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