Abstract
Nitrogen-fixing Rhizobia were discovered more than 100 years ago. They are
classified into two clades, Alphaand Beta-rhizobia.
Their symbiotic
function is remarkable, but its origin
and evolution has been confusing from a phylogenetic perspective.
In this study, we
make use of 33 publicly available complete genome sequences downloaded from
NCBI, which consist of bacteria and archaea, and focus on 10 strains,
constructing symbiotic structural maps for them based on their genomes and
previous gene annotations. Phylogenies of the symbiosisessential genes nodA and
nifH were examined.
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