Arthrobacter

Arthrobacter is a genus of Gram-positive, strictly aerobic soil bacteria with an irregular rod-to-coccus cell cycle, shifting shape as cultures age. In food production, Arthrobacter nicotianae serves as a starter culture for smear-ripened cheeses, where it contributes to rind development, colour, and flavour during ripening. Other species are exploited industrially for enzyme production thanks to their versatile metabolism. Their hardiness, including tolerance of dry and nutrient-poor conditions, makes them useful but occasionally persistent environmental organisms in food plants, where they can colonise surfaces. Identification relies on culture and molecular methods, and their presence in a plant is managed through standard sanitation rather than treated as a pathogen alert.