Plant defenses and population fluctuations of forest defoliators : mechanism-based scenarios
Plant defenses and population fluctuations of forest defoliators : mechanism-based scenarios
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植物防御和森林落叶植物的种群波动：基于机制的情景
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
E. Haukioja
中科院分区：
文献类型：
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作者：
E. Haukioja
在影响食叶害虫种群波动的因素中，植物防御的可能作用取决于防御（次级化合物、初级化合物和防御级联）的功能。次级化合物的延迟诱导产生似乎不能解释种群密度的周期性波动。相反，一般植物防御级联，特别是十八烷途径的性质，提出了新的潜在机制。昆虫的伤害和与太阳黑子有关的高紫外线辐射（UV-B）触发了十八烷途径。在桦树中，它也有助于落叶昆虫的免疫活性。因此，在爆发的增长阶段的低寄生率与诱导植物防御有潜在的联系。十八烷途径还参与挥发性植物化合物的产生，已知其改变其他植物的防御和寄生性天敌的行为。因此，十八烷途径和其他植物防御级联建议不受重视的植物介导的环境，食叶害虫的性能，寄生，和空间扩展的爆发之间的联系。
Among the factors contributing to defoliator population fluctuations the possible role of plant defenses depends on how defenses (secondary compounds, primary compounds, and defense cascades) are assumed to function. Delayed inducible production of secondary compounds does not seem to explain cyclic fluctuations in population density. Instead, properties of general plant defense cascades, especially of the octadecanoid pathway, suggest new potential mechanisms. Insect damage, and sunspot-related high ultraviolet radiation (UV-B), trigger the octadecanoid pathway. In birch it also contributes to defoliator immunocompetence. Therefore, the low rate of parasitism in the increase phase of an outbreak has potential connections to inducible plant defense. The octadecanoid pathway is also involved in the production of volatile plant compounds, known to modify defenses of other plants and the behavior of parasitoids. Accordingly, the octadecanoid pathway and other plant defense cascades suggest unappreciated plant-mediated connections between the environment, defoliator performance, parasitism, and spatial expansion of outbreaks.