Broccoli Research

Systemic Acquired Resistance: Plants’ Secret Weapon

Triggering Plants’ Immune Response Provides Protection Against Disease For nearly a century, plant scientists have known that when a plant survives a disease, it often is more resistant to subsequent infections. It’s as if the plant’s immune system has become stronger, and indeed it has. Because they are rooted in the ground, plants appear to be at the mercy of every disease or insect that comes their way. However, plants actually have a number of defense mechanisms. One of these is systemic acquired resistance (SAR), a whole-plant defensive response to disease. When a pathogen invades, a long-distance chemical signal...