PRF/J: The Role of Limiting Resources in Controlling Mutualistic and Parasitic Effects of Mycorrhizae

PRF/J：限制资源在控制菌根互利和寄生效应中的作用

• 批准号: 9403308
• 负责人: Nancy Johnson
• 金额: $ 6.96万
• 依托单位: NM Fellowships
• 依托单位国家: 美国
• 项目类别: Fellowship Award
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-06-01 至 1997-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9403308&HistoricalAwards=false
• 关键词: PRF; Role; Limiting; Resources; Controlling

9403308 Johnson This research will ascertain what factors regulate mycorrhizal effectivity in relation to mutualistic or parasitic relationships with their host plants. To be tested is the hypothesis that enrichment of a limiting soil resource causes mycorrhizal plants to allocate less carbon to root exudates, giving a selective advantage to parasitic forms of vesicular - arbuscular mycorrhizal (VAM) fungi. Fieldwork will be conducted on 24 fertilized, irrigated, and control plots at two NSF Long Term Ecological Research (LTER) sites (Minnesota's Cedar Creek Natural History Area and Sevilleta in New Mexico). %%% VAM fungi, relatively better studied in agricultural systems, are poorly known in natural ecological communities and ecosystems despite their ubiquitousness in soils. Nevertheless even in managed agricultural settings, these fungi are still largely regarded as "black boxes" in comparison to our knowledge of other components of agroecosystems. A more thorough understanding of VAM biology and ecology is likely to lead to improved practices by ranchers and farmers with regard to successful mycorrhizal inoculation programs, while a more comprehensive appreciation of natural mycorrhizal biodiversity will undoubtedly lead to as yet unforeseen improvements in managed agricultural and forest systems. ***

9403308 Johnson这项研究将确定哪些因素调节与宿主植物的相互主义或寄生关系有关的菌根效应。 要测试的假设是，富集有限的土壤资源会导致菌根植物分配较少的碳渗出液，从而有选择性优势，从而有选择性的优势 - 孢子形式 - 弧形菌根菌根（VAM）真菌。 将在两个NSF长期生态研究（LTER）地点（明尼苏达州的Cedar Creek自然历史区和新墨西哥州的Sevilleta）上对24个受精，灌溉和对照地块进行实地研究。 尽管在土壤中无处不在，但在农业系统中进行了相对更好的研究，在农业系统中相对更好的研究。 然而，即使在托管农业环境中，与我们对农业生态系统的其他组成部分相比，这些真菌仍被认为是“黑匣子”。 对VAM生物学和生态学的更彻底的了解可能会导致牧场主和农民在成功的菌根接种计划方面的改善，而对天然菌根生物多样性的更全面的欣赏无疑会导致托管农业和森林系统的不可预见的改进。 ***