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    Exopolysaccharide-deficient mutants of Astragali rhizobia are symbiotically effective on Astragalus sinicus, an indeterminate nodulating host

    Five exopolysaccharide-deficient mutants were isolated after rhizobial strain 107 was subjected to transposon Tn5 mutagenesis. The amount of EPS produced by the mutants was dramatically decreased to between 3%...

    Hancai Chen, Bei-Guo Long, Hong-Yu Song in Plant and Soil (1996)