Scientists in Italy have found bacteria in the root of a tropical grass whose oils have been used in the cosmetic and perfumery industries. These bacteria seem to promote the production of essential oils, but also they change the molecular structure of the oil, giving it different flavours and properties: termicidal, insecticidal, antimicrobial and antioxidant.

— From Bacteria Manage Perfume Oil Production From Grass, an article in Science Daily about how bacteria aid in the production of vetiver oil.