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Two prominent theories proposed to explain patterns of chemical defense expression in plants are the optimal defense theory (ODT) and the growth-differentiation balance hypothesis (GDBH). The ODT predicts that plant parts with high fitness value will be highly defended, and the GDBH predicts that slow growing plant parts will have more resources available for defense and thus will have higher defense...
Induced responses to herbivores in plants are thought to be a form of adaptive phenotypic plasticity, whereby plants save metabolic costs by expressing defenses only when they are necessary. Although costs of being inducible have never been examined, there have been many studies of costs of induced responses, with approaches ranging from the manipulation of induction with herbivores or wounding, and...
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