ScienceDaily (Apr. 26, 2010) — If plants did not defend themselves in some way, they would certainly be gobbled up by a whole suite of voracious predators ranging from little insects to large mammalian herbivores. Indeed, not only do plants defend themselves, they typically have more than one kind of defense. When a plant has several options, how does it choose? Does it allocate multiple defenses to the same tissues or defend different tissues in different ways?
http://www.sciencedaily.com/releases/2010/04/100423204746.htm