入侵植物在入侵地被昆虫取食的压力减小,尤其是缺少专食昆虫的取食,这将导致入侵植物的昆虫防御策略发生演化。植物减少防御的投入,而分配更多资源用于生长和繁殖。诱导防御是在植物受到刺激或伤害时才会表达出来,因而比组成型防御(始终在植物中表达的防御)的成本低。因此,入侵 Invaded plants are less stressed by insects, especially in the case of omnivorous insects, which leads to the evolution of insect defense strategies in invasive plants. Plants reduce defense inputs while allocating more resources for growth and reproduction. Induced defense is expressed only when a plant is stimulated or injured, and hence less costly than a constitutive defense (the defense always expressed in plants). Therefore, invasion