Table 1.

Strains and plasmids used in this study

Strains and plasmids	Details	Reference
Strains
Lc. mesenteroides NCDO2028	Beetroot silage isolate	UCC culture collection
Lc. mesenteroides CB200 to CB210	NCDO2028 derivatives that are resistant to roseoflavin	This study
Lb. plantarum WCFS1	Sequenced strain	[33]
Lb. plantarum NCDO1752	Pickled cabbage isolate	UCC culture collection
Lb. plantarum CB300 to CB305	NCDO1752 derivatives that are resistant to roseoflavin	This study
P. freudenreichii NIZO B374	CBS115915, formerly subsp. shermanii, now subsp. freudenreichii; cheese isolate	NIZO culture collection
P. freudenreichii NIZO B2336	Roseoflavin resistant derivative of strain NIZO B374	This study
P. freudenreichii NIZO B374.21	Roseoflavin resistant derivative of strain NIZO B374	This study
P. freudenreichii NIZO B369	CBS115914; From Eidg. Milchw. Versuchsanstalt. Liebefeld	NIZO culture collection
P. freudenreichii NIZO B2663 to NIZO B2672	Roseoflavin resistant derivatives of strain NIZO B369	This study