Table 1.

Source and properties of Lactococcus lactis subsp. lactis strains used in this work.

Strain-code	Source and properties	Reference	Lcn972 MIC1 (AU/ml)	Growth rate2 (h-1)
L. lactis L81	Commercial mesophilic starter. Acidifying strain	CHCC collection	10	0.69 ± 0.10
L81-D1	Resistant to Lcn972	This work	80	0.83 ± 0.04∗
L81-E2	Resistant to Lcn972	This work	320	0.79 ± 0.01
L. lactis L62	Commercial mesophilic starter. Acidifying strain	CHCC collection	10	0.84 ± 0.01
L62-C9	Resistant to Lcn972	This work	320	0.89 ± 0.04
L62-G9	Resistant to Lcn972	This work	80	0.80 ± 0.02
L. lactis L98	Bioprotective culture. Nisin A producer	CHCC collection	40	0.95 ± 0.01
L98-C1	Resistant to Lcn972	This work	160	0.90 ± 0.04∗
L98-E2	Resistant to Lcn972	This work	160	0.81 ± 0.09∗
L. lactis IPLA517	Raw milk cheese, nisin Z producer	Martínez et al., 1995	10	0.95 ± 0.01
517-B5	Resistant to Lcn972	This work	320	0.74 ± 0.06
517-C6	Resistant to Lcn972	This work	160	0.82 ± 0.16
L. lactis IPLA641	Raw milk cheese, nisin Z producer	Martínez et al., 1995	10	0.98 ± 0.09
641-C8	Resistant to Lcn972	This work	80	0.87 ± 0.09
641-D8	Resistant to Lcn972	This work	160	0.79 ± 0.01
L. lactis IPLA729	Raw milk cheese, nisin Z producer	Martínez et al., 1995	10	1.08 ± 0.04
729-D10	Resistant to Lcn972	This work	160	0.97 ± 0.00
729-F9	Resistant to Lcn972	This work	160	0.90 ± 0.03∗
L. lactis IPLA1064	Raw milk cheese, nisin Z producer	Martínez et al., 1995	10	0.97 ± 0.00
1064-C11	Resistant to Lcn972	This work	160	0.81 ± 0.01
1064-E11	Resistant to Lcn972	This work	160	0.78

¹MIC, Minimal Inhibitory Concentration. AU, Arbitrary Units.

²Growth rate in LM17 broth at 30°C. Results are the mean ± standard deviation (n = 2).

^∗Statistically different (p < 0.05) compared to the equivalent wild-type strain.