What does the published scientific research say about Lactococcus lactis?

Eight PubMed articles reference Lactococcus lactis — also known by its former name Streptococcus lactis — in plant-input contexts. Peer-reviewed research consistently describes the organism as GRAS (generally recognized as safe), with strains believed to have originated in plant-based habitats before their wider adoption in dairy fermentation.

The most direct agricultural findings concern biocontrol. Research reported that Lc. lactis subsp. lactis strain RBX7 suppressed bacterial leaf blight in rice — caused by Xanthomonas oryzae pv. oryzae and Pantoea ananatis — through live culture and cell-free supernatant, with in planta assays confirming symptom reduction and metabolomic profiling identifying antimicrobial compounds. A separate study on a plant-origin Lc. lactis subsp. cremoris strain isolated antifungal cyclo-(Leu-Pro) and tetradecanoic acid as active metabolites, with the authors noting broad antifungal spectrum potential for food and feed biocontrol applications.