Abstract
Vicia faba L. (faba bean) is a legume cultivated worldwide which commonly establishes effective symbiosis with the symbiovar viciae of species from the Rhizobium leguminosarum phylogenetic group. However, on the basis of the rrs, recA, and atpD gene phylogenies, in this work we identified a strain named EFBRI 42 nodulating V. faba as Rhizobium azibense. This is the first report on the nodulation of Vicia by R. azibense which commonly nodulates P. vulgaris and to date encompasses strains harboring the nodC genes typical of the symbiovars gallicum and phaseoli. However, the strain EFBRI 42 carries a nodC gene typical of the symbiovar viciae for which we report here by the first time this symbiovar in R. azibense. This finding showed the existence of symbiotic genes horizontal transfer events during the coevolution of R. azibense with P. vulgaris and V. faba in their respective distribution centers of Mesoamerica and the Middle East.
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