title: Mesophilic Lactic Acid Bacteria Diversity Encountered in Brazilian Farms Producing Milk with Particular Interest in Lactococcus lactis Strains.
abstract: The milk produced in regions with different traditions in Brazil is used for artisanal product production, which is characterized by different sensorial characteristics. This study aimed to identify the bacterial ecosystem of farms located in a traditional dairy region in the state of Minas Gerais and to characterize Lactococcus lactis strains, the species of interest in this study, using a multilocus sequence typing (MLST) protocol and pulsed-field gel electrophoresis (PFGE) technique. Samples were collected from raw milk and dairy environment from six farms. A total of 50 isolates were analyzed using 16S rRNA sequencing and species-specific PCR. Five genera were identified: Lactobacillus, Leuconostoc, Lactococcus, Enterococcus, and Staphylococcus, from ten different species. MLST (with six housekeeping genes) and PFGE (with SmaI endonuclease) were used for the characterization of 20 isolates of Lactococcus lactis from a dairy collection in this study. Both methods revealed a high clonal diversity of strains with a higher discriminatory level for PFGE (15 pulsotypes), compared to MLST (12 ST). This study contributes to the preservation of the Brazilian dairy heritage and provides insights into a part of the LAB population found in raw milk and dairy environment.
authors.affiliation: Departamento de Tecnologia de Alimentos, Universidade Federal de Viçosa-UFV, Viçosa, MG, Brazil. liv.liv.pin@gmail.com.
authors.forename: L M P
authors.initials: LM
authors.lastname: Luiz
authors.affiliation: INRA UMR 1253, Science et Technologie du Lait et de l'Œuf, F-35042, Rennes, France.|UMR 1253, Agrocampus Ouest, Science et technologie du lait et de l'Œuf, F-35042, Rennes, France.
authors.forename: V
authors.initials: V
authors.lastname: Chuat
authors.affiliation: INRA UMR 1253, Science et Technologie du Lait et de l'Œuf, F-35042, Rennes, France.
authors.forename: M N
authors.initials: MN
authors.lastname: Madec
authors.affiliation: Universidade Federal do Triângulo Mineiro-UFTM, Uberaba, MG, Brazil.
authors.forename: E A
authors.initials: EA
authors.lastname: Araújo
authors.affiliation: Departamento de Tecnologia de Alimentos, Universidade Federal de Viçosa-UFV, Viçosa, MG, Brazil.
authors.forename: A F
authors.initials: AF
authors.lastname: de Carvalho
authors.affiliation: INRA UMR 1253, Science et Technologie du Lait et de l'Œuf, F-35042, Rennes, France.|UMR 1253, Agrocampus Ouest, Science et technologie du lait et de l'Œuf, F-35042, Rennes, France.
authors.forename: F
authors.initials: F
authors.lastname: Valence
mesh_terms: D000818:Animals; D044822:Biodiversity; D001938:Brazil; D002417:Cattle / Q000378:metabolism / Q000382:microbiology; D000072480:Farms; D005260:Female; D019344:Lactic Acid / Q000378:metabolism; D056546:Lactobacillales / Q000145:classification / Q000235:genetics / Q000302:isolation & purification* / Q000378:metabolism; D013294:Lactococcus lactis / Q000145:classification / Q000235:genetics / Q000302:isolation & purification* / Q000378:metabolism; D008892:Milk / Q000382:microbiology*; D058885:Multilocus Sequence Typing; D010802:Phylogeny
chemical_list: D019344:Lactic Acid