Yep, like when you fall and skin your knee. Immediately, thousands of teeny-weeny, microscopic good guys called antibodies rush to the injury. They keep your skin from getting infected by bacteria in the dirt or on the sidewalk where you fell. The antibody army is part of your own immune system .
Plants have a similar kind of built-in protection.
When a bug lands on a plant leaf and starts to chew it, something in its spit, or saliva, tells the plant that it's time to start fighting back. Okay, pop quiz time. Aw, quit whining. A. Pathogenesis Related B. Public Relations C. Plant Rescue PR proteins start operating when an outside enemy like an insect or a disease attacks a plant. But sometimes the damage from outside invaders can overwhelm a plant before the proteins can shift into high gear.