Growth of S. meliloti 1021, Sce10, and Sce11 in the presence of 400 mM NaCl with and without amino acid supplementation. Data are expressed as the ratio of the OD595 in PMM–400 mM NaCl. Error bars represent the SEM of three growing cultures measured once (n = 3). White bars, PMM–400 mM NaCl; gray bars, PMM–400 mM NaCl–glutamate; black bars, PMM–400 mM NaCl–glutamine.