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ACC deaminase activities of the S. meliloti strains induced by 5 mM ACC. R. leguminosarum bv. viciae 128C53K, which is the source of the lrpL and acdS genes, was used as a positive control. Rm1021 and Rm5356 are wild-type strains that were used as negative controls. Rm1021 containing the vector pSP329 was also used as a negative control for Rm1021(pWM2). N/D, no activity detected. The error bars represent the standard error of the mean of two independent assays.
