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

WPC 2 B V T W Courier 10 Pitch c z N x，x@；HP LaserJet(25-in-one，Network)HPLase II.PrS X t 4 P RN h 0为2 4#|x 9306795 Bowers寄主植物化学和捕食在决定昆虫草食动物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实验，利用克隆的基因来操纵植物防御化学(车前草中的环烯醚萜苷和苯丙素苷)的表达。第一组实验将评估寄主植物基因型与昆虫捕食者之间的化学差异对昆虫草食动物的觅食模式、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。它使用了防御化学水平有很大差异的寄主植物基因型，处理环烯醚苷能力不同的四种毛虫，以及两种不同种类的昆虫捕食者(臭虫和黄蜂)。第二个系列的实验将集中在新孵化的镜面毛虫的行为、生长速度和存活率决定它们在宿主植物中诱导防御化学时的行为、生长速度和存活率。%大多数关于植物食草动物关系的工作要么集中在寄主植物化学上，要么集中在天敌在隔离中的作用。当前的项目研究了这些因素之间的相互作用。这一点很重要，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.