Design of the original field experiment setup in Gorzyń, Poland, in 1994 (Fig. S1), Bradyrhizobium japonicum USDA 110–specific sequence (Fig. S2), nucleotide sequences of the recA gene of USDA 110 and USDA 123 (Fig. S3), supplemental methods, strain serotypes in the nodules of individual plants grown in 2010 in soil taken from the location of original field experiment of 1994 in Gorzyń (Table S1), and numbers of bacterial cells reacting with the strain-specific fluorescent antibodies against Bradyrhizobium japonicum USDA 123 and B. japonicum USDA 110 (Table S2).
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