Collaboration: The Role of Plant-Pathogen Interactions in Explaining and Constraining Weed Invasions: Testing Theories of Biotic Resistance and the Natural Enemies Hypothesis

吉尔伯特帕克加州大学伯克利分校-圣克鲁斯DEB - 9806517 9808501 入侵生物生态学中的一个中心问题是为什么一些引入的植物物种在栖息地中失败，而另一些则成为具有高种群的有害入侵者。 两个相互竞争的理论已经提出来回答这个问题，重点是天敌在调节入侵植物物种的种群动态中的作用。天敌假说是经典生物控制计划的基础，它提出成功的入侵者会留下控制它们的害虫和病原体。 生物抗性假说认为，大多数入侵生物是天然食草动物和病原体的成功目标，成功的入侵是正常情况下的例外。本计画将以三叶草与牛肝草三叶草为模式系统来验证这两个假说。它将使用田间和温室实验的组合来研究植物-病原体的相互作用，以比较本地与外来三叶草，试图在不同地点的情况下进行排序。 它将检验抗病性在本地宿主中应该更普遍的预测-与生物抗性假设一致。

Gilbert & Parker University of California-Berkeley & -Santa Cruz DEB - 9806517 & 9808501 A central question in the ecology of invading organisms involves why some introduced plant species fail to succeed in a habitat while others become noxious invaders with high populations. Two competing theories have been posed to answer this question focusing on the role of natural enemies in regulating the population dynamics of invading plant species. The natural enemies hypothesis, the foundation for classical biological control programs, proposes that successful invaders leave behind the pests and pathogens that control them in their home habitats. The biotic resistance hypothesis suggests that most invading organisms are the successful targets of natural herbivores and pathogens and that successful invasions are the exception to the usual run of things. This project will test these two hypotheses using clover and burclover as a model system. It will examine plant-pathogen interactions using a combination of field and greenhouse experiments to compare native vs. exotic clovers in trying to sort through situations in different locations. It will test the prediction that disease resistance should be more prevalent in native hosts - consistent with the biotic resistance hypothesis.