Depression of synthesis of linoleyl residue in Zygosaccharomyces rouxii cells by sodium chloride

The syntheses of fatty acyl residues in a salt-tolerant yeast, Zygosaccharomyces rouxii, were compared under 4 growth conditions as follows, transfer from; (A) NaCl-free medium to the same medium, (B) NaCl-free medium to 2 M NaCl medium, (C) 2 M NaCl medium to the same medium, and (D) 2 M NaCl medium to NaCl-free medium. The synthesis of linoleyl residue 18:2) was depressed by the presence of 2 M NaCl while that of oleyl residue (18:1) was not. Under condition D, however, the synthesis of 18:2 recovered in the NaCl-free medium. These phenomena were confirmed through pulse-labeling and chase experiments. It is suggested that desaturation from 18:1 to 18:2 may be depressed by the presence of 2 M NaCl.