Collaborative Research: Relative Effects of Hostplant Chemistry and Insect Predators on Herbivorous Insects and their Hostplants

WPC 2 B V 不 W C10节距c z N x x x， X @ ; HP Laserjet（25合一，网络） HPLASEII.PRS X t 4 P RN h 0 IS 2 4 #|X 小行星9306795 寄主植物化学和捕食在决定植食性昆虫觅食模式中的相对重要性以及这些因素的影响程度在很大程度上是未知的。 该项目将包括两个系列的田间试验，与表达hosrplant防御化学（环烯醚萜苷和苯丙素苷， Plantago lanceolata ）通过使用克隆的基因型操作。 第一组实验将评估寄主植物基因型与昆虫捕食者的化学变异对昆虫食草动物的觅食模式、生长、防御化学、繁殖力和存活率的相对影响，并评估对寄主植物表型和昆虫捕食者的影响。 它使用的寄主基因型在防御化学水平上有很大差异，四种毛虫在处理环烯醚萜苷的能力上不同，还有两种不同的昆虫捕食者（蝽象和黄蜂）。 第二个系列的实验将集中在行为，生长速度和新孵化的specialist毛毛虫的生存决定，当他们诱导防御化学寄主植物。大多数关于植物植食性关系的研究集中在寄主植物化学或孤立的天敌的作用上。 目前的项目审查这些因素的相互作用。 这是重要的，因为它阐明了控制作物或森林植物潜在害虫的机制，以及维持这些系统的生物多样性的过程。

WPC 2 B V T W Courier 10 pitch c z N x x x , x @ ; HP Laserjet (25-in-one, Network) HPLASEII.PRS X t 4 P RN h 0 IS 2 4 #| x 9306795 Bowers The ralative importance of hostplant chemistry and predation in determining foraging patterns of insect herbivores and the degree to which these factors intract are largely unknown. This project will include two series of field experiments, with the expression of hosrplant defensive chemistry (iridoid glycosides and phenylpropanoid glycosides in Plantago lanceolata ) manipulated by using cloned genotypes. the first set of experiments will assess the relative effects of chemical variation in hostplant genotypes versus insect predators on the foraging patterns, growth, defensive chemistry, fecundity and survivorship of insect herbivores, plus evaluate the consequences for the hostplant henotypes and insect predators. It uses hostplant genotypes that vary considerably in their levels of defensive chemistry, four caterpillar species that differ in their ability to handle iridoid glycosides and two different kinds of insect predators (stinkbugs and wasps). A second series of experiments will focus on the behavior, growth rate and survivorship of newly hatched specalist caterpillars determine when they induce defensive chemistry in hostplants. %%% Most work on plant herbivore relatiosnship hjas focused either on hostplant chemistry or on the role of natural enemies in isolation. The current project examines the interactions of these factors. This is inmportant because it elucidates mechamisms that control potential pests of crop or forest plants as well as processes that maintain biological diversity of these systems.