“Tomato Wars” — The Discovery Files

A team of scientists from Cornell University is studying the evolutionary struggle in which plants and diseases are in a continual war to outdo each other. Plants build up a resistance to a disease, but then the pathogens quickly evolve to overcome the plants’ defenses. The Cornell team is studying a battle involving a bacterium that infects tomatoes by injecting a special protein into the plant’s cell to undermine the plant’s defense system. More evidence of that ongoing arms race in the plant world!