I have observed some biogeographic patterns of distribution among Rhizobium leguminosarum symbiovar viciae.
I have not seen a satisfactory answer.
Clearly microorganisms with a close relationship with plants or animals will follow their geographic distribution.
I assume your Rhizobium would only be found free-living in soil surrounding the host plant
It seems that microbes (including bacteria) might show biogeographic patterns, e.g.
https://www.researchgate.net/publication/6734515_Allopatric_origins_of_microbial_species
https://www.researchgate.net/publication/23163831_Colloquium_paper_microbes_on_mountainsides_contrasting_elevational_patterns_of_bacterial_and_plant_diversity
Article Allopatric origins of microbial species
Article Bryant JA, Lamanna C, Morlon H, Kerkhoff AJ, Enquist BJ, Gre...
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