globalchange  > 影响、适应和脆弱性
项目编号: 1401677
项目名称:
DISSERTATION RESEARCH: Plant interactions across common mycorrhizal networks
作者: Leonel Sternberg
承担单位: University of Miami
批准年: 2013
开始日期: 2014-06-01
结束日期: 2016-11-30
资助金额: USD19181
资助来源: US-NSF
项目类别: Standard Grant
国家: US
语种: 英语
特色学科分类: Biological Sciences - Environmental Biology
英文关键词: cmn ; researcher ; mineral nutrient ; plant ; big bluestem ; research ; host plant ; root system ; plant species ; host plant species ; common mycorrhizal network ; other plant species ; canada wild rye ; plant competition belowground
英文摘要: This investigation concerns the role of common mycorrhizal networks (CMNs) "fungus interconnections among plant root systems" in plant competition belowground. CMNs are formed by generally beneficial, root-inhabiting fungi called "arbuscular mycorrhizal fungi". Plants feed these fungi some of the sugar they produce by photosynthesis, and in return, the fungi take up and provide the plants with key mineral nutrients such as phosphorus and nitrogen. Once connected to a host plant's roots, the fungi forage throughout the soil and may encounter root systems of other plant species with which they additionally associate without preference, creating a network. The major question this raises is whether all plants connected to the network share mineral nutrients equitably or if mycorrhizal fungi disproportionately donate mineral nutrients to host plant species that provide them the most sugar. The researchers utilize tallgrass prairie species for their research, Big Bluestem and Canada Wild Rye. Tallgrass prairie is an endangered ecosystem in North America and prairie restorations often involve sowing the study species together. Understanding how CMNs affect interactions between these plant species might inform restoration management practices such as tillage, which can disrupt CMNs. Besides its relevance to prairie restoration, this research will engage Miami inner-city middle school students and university undergraduates from underrepresented groups.
The researchers will investigate competition as mediated by CMNs between a tallgrass prairie dominant grass, Big Bluestem (Andropogon gerardii) and a less common species, Canada Wild Rye (Elymus canadensis). If Big Bluestem is able to obtain mineral nutrients disproportionately and thereby suppress the growth of Canada Wild Rye, then CMNs may contribute to Big Bluestem's dominance, influencing prairie community composition. The researchers will utilize a rotated conetainer method in the greenhouse to isolate and reveal the effects of CMNs
by severing them. The proposed work will determine the effects of CMNs on the relative strengths
of intra- and interspecific competition and consequent size hierarchy development. The student
will investigate if large carbon donation to CMNs elicits high mineral nutrient transfer from
mycorrhizal fungi by using carbon stable isotope ratios to compare carbon supplied by these
C4 and C3 grasses to their leaf mineral nutrient contents in monoculture and mixture. Finally,
if severing CMNs alters the fungus community on root systems, this will be investigated through DNA barcoding.
资源类型: 项目
标识符: http://119.78.100.158/handle/2HF3EXSE/96787
Appears in Collections:影响、适应和脆弱性
气候减缓与适应

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Recommended Citation:
Leonel Sternberg. DISSERTATION RESEARCH: Plant interactions across common mycorrhizal networks. 2013-01-01.
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