Phytoalexin

• Phytoalexins are antibiotics produced by plants when under attack by pathogens such as bacteria or fungi
• Resveratrol is a phytoalexin produced naturally by several plants — including vines.
• Resveratrol is found in the skin of red grapes.Malbec has a thick skin and contains much resveratrol.
• Vine grapes grown in cooler climates have higher resveratrol levels than those from warmer climes 
• The varieties with most resveratrol in the wine include malbec, petite sirah, st. laurent and pinot noir.
• Phytoalexins tend to fall into several classes including terpenoids, glycosteroids and alkaloids
• Phytoalexins produced in plants act as toxins to the attacking organism.