Table 4.

Osmotic and pH stress sensitivity profiles¹.

PM plate ID	Lineage I				Lineage II
PM09	LL195	N2306	N16-0044	N14-04354	EGDe	Lm3136	Lm3163	N11-1515
10% NaCl	+	+	+	+	+	+	+	+
11% Sodium lactate	+	+	+	+	+	-	+	-
200 mM sodium benzoate + pH 5.2	+	+	+	+	+	+	+	+
80 mM sodium nitrite	+	+	+	+	-	-	+	+
PM10
pH 4.5	-	-	-	-	-	-	-	-
L-Asparagine + pH 4.5	+	-	-	-	-	-	-	-
L-Serine + pH 4.5	+	-	-	-	-	-	-	-
L-Citrulline + pH 4.5	-	-	+	-	-	-	-	-
L-Valine + pH 4.5	+	-	+	-	-	-	-	-
L-Hydroxyproline + pH 4.5	+	-	+	-	-	-	+	-
L-Ornithine + pH 4.5	-	-	-	+	-	-	-	-
L-Homoserine + pH 4.5	+	-	-	-	-	-	-	-
L-Norvaline + pH 4.5	+	+	+	+	+	+	+	+
D,L-α-Amino-butyric acid + pH 4.5	+	-	-	-	-	-	+	-
L-Cysteic acid + pH 4.5	+	-	+	-	-	-	+	-
5-Hydroxy-L-lysine + pH 4.5	+	-	+	-	-	-	-	-
D,L-Diamino-pimelic acid + pH 4.5	-	-	-	-	-	-	+	-
Urea + pH 4.5	+	-	-	-	-	-	-	-
pH 9.5	+	+	+	+	+	+	+	+
β-Phenylethylamine + pH 9.5	+	+	+	+	+	-	-	+

¹Opm generated results showing phenotypic variability on different osmotic and pH stress conditions among the isolates: Substances such as L-norvaline enhanced L. monocytogenes resistance to acidic stress whereas β-phenylethylamine inhibited alkaline stress resistance in a strain dependent manner. Symbols: -, negative reaction; +, positive reaction.