* Output sequences were classified into reference (100% identity in at least 1 of 196 Rhizobium leguminosarum symbiovartrifolii genomes ), exact BLAST (100% query coverage and 100% identity against the whole-genome shotgun contigs BLAST database), single nt (one nt difference from either reference or exact BLAST match), and other .

^† The population globalF _ST (fixation index) is an estimate of genetic differentiation among populations based on relative allele abundance.