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Feedback Between Plants and Soil Microbes in Serpentine and Prairie Grasslands

蛇纹石和草原植物与土壤微生物之间的反馈

基本信息

批准号：
0350091
负责人：
Brenda Casper
金额：
$ 30万
依托单位：
University of Pennsylvania
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2004
资助国家：
美国
起止时间：
2004-05-01 至 2008-04-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=0350091&HistoricalAwards=false
关键词：
Feedback Between Plants Soil Microbes

项目摘要

Feedback between plants and soil microbes in serpentine and prairie grasslandsThis research investigates whether the relationships between certain grass species and their mycorrhizal fungi play a role in maintaining plant species diversity in natural communities. Mycorrhizal fungi generally form mutually beneficial associations with plant roots. Plants supply the fungi with sugars and, in return, receive benefits that include increased uptake of water and nutrients, and in some cases, increased ability to cope with toxic metals. Recent studies have documented negative feedback between different mycorrhizal fungi and different plant species, where the fungi associated with a particular plant species do not provide as much benefit to that plant species as do fungi associated with other plant species in the community. Consequently, when one plant dies and its mycorrhizal fungi and any associated pathogenic fungi remain in the soil, that plant is likely to be replaced by a different plant species, thereby promoting species diversity. This work builds on negative feedback found in a grassland on serpentine soil, which naturally has a high heavy metal content. Negative feedback will be further explored at that site and in the tallgrass prairie, where these same grasses occur. Results may also help in developing mycorrhizal fungi that facilitate remediation of soils polluted with heavy metals.

蛇形和草原草地植物与土壤微生物的反馈本研究探讨了某些草类及其菌根真菌之间的关系是否在维持自然群落植物物种多样性中起作用。菌根真菌通常与植物根系形成互利的联系。植物为真菌提供糖，作为回报，植物获得的好处包括增加了对水和养分的吸收，在某些情况下，还增强了处理有毒金属的能力。最近的研究记录了不同菌根真菌和不同植物物种之间的负反馈，其中与特定植物物种相关的真菌对该植物物种的益处不如与群落中其他植物物种相关的真菌。因此，当一种植物死亡时，它的菌根真菌和任何相关的致病真菌仍留在土壤中，该植物很可能被不同的植物物种所取代，从而促进物种多样性。这项工作建立在蛇形土壤草原负反馈的基础上，蛇形土壤自然具有较高的重金属含量。负面反馈将在该地点和高草草原进一步探索，这些草在那里生长。研究结果也可能有助于开发菌根真菌，促进重金属污染土壤的修复。