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Nodulation and succinoglycan production phenotypes of relA and suppressor mutants. (A) Alfalfa plants 2 weeks postinoculation with wild-type (wt), relA, and the four reisolated suppressor strains. (B) Bacteria patched onto rich TY-MGAS medium containing 0.02% calcofluor. Fluorescence was visualized under long-wave UV light. (Class I strains, DW364 and DW371; class II strains, DW362 and DW366.)
