DISSERTATION RESEARCH: The role of rhizobial mutualisms in the establishment and colonization of non-native acacia species in California

论文研究：根瘤菌互利共生在加利福尼亚州非本地金合欢树种的建立和定殖中的作用

• 批准号: 1311290
• 负责人: Kyle Harms
• 金额: $ 1.92万
• 依托单位: Louisiana State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-06-01 至 2015-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1311290&HistoricalAwards=false
• 关键词: DISSERTATION; RESEARCH; role; rhizobial; mutualisms

Plants that harbor nitrogen-fixing bacteria, such as alfalfa and soybean, are an important natural source of soil fertility. The bacteria also increase the growth of their host plants, and some wild plants with N-fixing bacteria become highly invasive; they spread and crowd out other species when introduced by humans to a new region. This project will test the hypothesis that the invasiveness of these introduced plants is determined by their ability to form relationships with the N-fixing bacteria in their new habitats, or by whether their own N-fixing bacteria have been introduced along with them. Researchers will compare the species of trees and shrubs in the genus Acacia that have been introduced to California from Australia. Some of these species have spread widely, while others have not become invasive. The project will use molecular genetic techniques to distinguish native, Californian, N-fixing bacteria from introduced, Australian bacteria, and test whether the more invasive species are more able to harbor Californian bacteria, have more Australian bacteria, or depend less upon N-fixing bacteria for their own growth.Australian Acacias have become invasive in the U.S. and around the world, threatening agricultural lands and areas of conservation concern, and reducing water supplies. Results from this project will help managers control the spread of these trees and of other N-fixing, invasive plants. Researchers will actively disseminate results to habitat restoration programs near San Francisco and San Diego. The project will also train a Ph.D. student and two undergraduates and develop presentations for K-12 students in Louisiana.

含有固氮细菌的植物，如苜蓿和大豆，是土壤肥力的重要天然来源。这些细菌也增加了它们的宿主植物的生长，一些带有固氮细菌的野生植物变得高度入侵;当人类将它们引入一个新的地区时，它们会传播并排挤其他物种。本项目将检验这一假设，即这些引进植物的入侵性取决于它们与新生境中的固氮细菌形成关系的能力，或者取决于它们自己的固氮细菌是否沿着一起引进。研究人员将比较从澳大利亚引入加州的金合欢属树木和灌木的种类。其中一些物种已经广泛传播，而另一些则没有成为入侵者。 该项目将使用分子遗传技术来区分本地的加利福尼亚固氮细菌和引进的澳大利亚细菌，并测试更具入侵性的物种是否更能够庇护加利福尼亚细菌，拥有更多的澳大利亚细菌，或者更少地依赖固氮细菌来生长。澳大利亚阿卡西亚斯已经在美国和世界各地具有入侵性，威胁到农业用地和受保护地区，并减少供水。该项目的结果将有助于管理人员控制这些树木和其他固氮、入侵植物的蔓延。研究人员将积极地将结果传播给弗朗西斯科和圣地亚哥附近的栖息地恢复项目。该项目还将培养一名博士。学生和两名本科生，并为路易斯安那州的K-12学生开发演示文稿。