phytoalexin
/ˌfaɪtoʊəˈlɛksɪn/
noun
- A substance produced by a plant in response to attack by a pathogen, helping to defend against infection.
- When a fungus attacks, the plant releases phytoalexin to stop the infection.
- Grapevines produce phytoalexin when threatened by mildew.
- Scientists are studying phytoalexin as a natural alternative to chemical pesticides.