Specificity of induced resistance in wild radish: causes and consequences for two specialist and two generalist caterpillars
Specificity of induced resistance in wild radish: causes and consequences for two specialist and two generalist caterpillars
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DOI：
10.1034/j.1600-0706.2000.890308.x
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发表时间：
2000-06-01
期刊：
影响因子：
3.4
通讯作者：
Agrawal, AA
中科院分区：
文献类型：
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作者：
Agrawal, AA
诱导植物对食草动物的抗性正在成为植物-食草动物生态学的一个范例。“诱导”和“效应”的特殊性是理解诱导抗性及其进化生态学的基础。诱导抗性的特异性是指不同食草动物对植物的伤害是否在植物中引起相同的反应。诱导抗性效应中的特异性是指诱导对不同的草食动物是否具有相同的后果(即，减少偏好或表现)。我研究了诱导的特异性和使用四种鳞翅目食草动物和野生萝卜植物的效果，在这个系统中，植物的适应收益和诱导成本都已被记录在案。在诱导植物抗性的特异性和诱导植物抗性的效果方面发现了差异；然而，这种差异与草食动物的饮食专门化(即专家和多面手)无关。由小菜蛾(专家)和夜蛾(多面手)诱导产生对所有食草动物的普遍抗性，由斑潜蝇(专家)引起的诱导只对Spotor tera(多面手)和Pieris产生抗性，而木霉(多面手)对植物的伤害不能诱导抗性并降低任何草食性动物的表现。相反，与未诱导的对照相比，被毛霉菌伤害的植株支持随后取食毛霉菌的生长增强。这些结果将植物和咀嚼叶子的毛虫之间的相互作用增加了一个新的复杂程度。在同一群食草动物中，有些食草动物表现出较强的诱导抗性，无诱导抗性或诱导敏感性。同样，毛虫物种在诱导抗性影响其表现的水平上也是不同的。这种相互作用限制了植物和食草动物之间成对共同进化的可能性，并表明共同进化只能是扩散的。
Inducible plant resistance against herbivores is becoming a paradigm of plant-herbivore ecology. Fundamental to understanding induced resistance and its evolutionary ecology is specificity of "induction" and "effects". Specificity in the induction of resistance refers to whether plant damage by various herbivores causes the same response in plants. Specificity in the effects of induced resistance refers to whether induction has the same consequences (i.e., reduced preference or performance) for various herbivores. I examined both specificity of induction and effect employing four lepidopteran herbivores and wild radish plants, a system for which fitness benefits and costs of induction have been documented for the plant. Variation in the specificity of induction and effects of induced plant resistance was found; however, this variation was not associated with diet specialization in the herbivores (i.e., specialists vs generalists). Induction caused by Plutella (specialist) and Spodoptera (generalist) resulted in general resistance to all of the herbivores, induction caused by Pieris (specialist) induced resistance only to Spodoptera (generalist) and Pieris, and plant damage by Trichoplusia (generalist) failed to induce resistance and reduce the performance of any of the herbivores. To the contrary, plants damaged by Trichoplusia supported enhanced growth of subsequently feeding Trichoplusia compared to uninduced controls. These results add a novel level of complexity to interactions between plants and leaf chewing caterpillars. Within the same guild of feeders, some herbivores cause strong induced resistance, no induced resistance, or induced susceptibility. Similarly, caterpillar species were variable in the level to which induced resistance affected their performance. Such interactions limit the possibility of pairwise coevolution between plants and herbivores, and suggest that coevolution can only be diffuse.