Fig. 2
(a) no stress (LS4D); (b) nitrite stress (LS4D + 0.15 mM NaNO2); (c) nitrate stress (LS4D + 30 mM NaNO3); and (d) the growth phenotype of complemented mutants with extra 30 mM NaNO3 in the medium. JZ001P: JZ001 with empty vector pMO719; ME2543(C): the complemented strain of ME2543; ME2547(C): the complemented strain of ME2547. The complemented strain for ME2548 was not obtained.