Testing a Unified Hypothesis of Mycorrhizal Function

检验菌根功能的统一假设

• 批准号: 0316136
• 负责人: Nancy Johnson
• 金额: --
• 依托单位: Northern Arizona University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-08-01 至 2010-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0316136&HistoricalAwards=false
• 关键词: Testing; Unified; Hypothesis; Mycorrhizal; Function

The primary goal of this research program is to identify principles that will help predict how arbuscular mycorrhizae function in natural and human-managed ecosystems. Arbuscular mycorrhizae (AM) are composed of widespread beneficial interactions between plant roots and specialized fungi. The availability of nutrients and light, patterns of resource allocation to fungal structures, and evolutionary history may all be important factors controlling the beneficial effects of these organisms. The research proposed here will test the importance of each of these three factors, and use the results to develop a unified hypothesis of mycorrhizal function. Mycorrhizal structure and how it relates to their beneficial functions will be studied at three grassland sites that differ in soil nutrient characteristics ( Konza Prairie, Kansas; Cedar Creek, Minnesota; Fermilab Department of Energy (DOE) site, Illinois). The effects of soil nutrient concentrations and of light availability on how mycorrhizae allocate resources to different structures and functions will be assessed in field and greenhouse studies. The proposed research will work towards linking field-based measurements of AM structure with their mutualistic function. There are several broader impacts of this study. It will forge partnerships among several institutions, including an international collaboration. Northern Arizona University is uniquely positioned to train Native American and Hispanic students by involving them directly in research and in student-initiated projects.

本研究计划的主要目标是确定有助于预测丛枝菌根在自然和人为管理的生态系统中如何发挥作用的原则。丛枝菌根（AM）是由植物根系和特定真菌之间广泛的有益相互作用组成的。营养和光照的可用性、真菌结构的资源分配模式和进化历史可能都是控制这些生物有益作用的重要因素。这里提出的研究将测试这三个因素中的每一个的重要性，并使用结果来开发一个统一的菌根功能假设。菌根结构及其与有益功能的关系将在三个不同土壤养分特征的草地上进行研究（堪萨斯州的康扎草原；明尼苏达州的雪松溪；伊利诺伊州的费米实验室能源部（DOE）站点）。土壤养分浓度和光照对菌根如何将资源分配给不同结构和功能的影响将在田间和温室研究中进行评估。拟议的研究将致力于将基于现场的AM结构测量与它们的相互作用联系起来。这项研究有几个更广泛的影响。它将在几个机构之间建立伙伴关系，包括国际合作。北亚利桑那大学的独特定位是通过直接参与研究和学生发起的项目来培养美洲原住民和西班牙裔学生。