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Nodule numbers (panel A) and shoot dry weights (panel B) of alfalfa inoculated with wild-type S. meliloti strains Rm1021 and Rm5356 and their ACC deaminase-producing variants, Rm1021(pWM2) and Rm11466. Plants not inoculated with a bacterium (0.85% NaCl only) were used as negative controls. Two independent nodulation assays were performed, and each had 18 plants per treatment. The error bars represent the standard error of the mean of a pool of 36 plants.
