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Title: MICROBIAL COMMUNITY STRUCTURE UNDER ENDOPHYTE-FREE AND ENDOPHYTE-INFECTED TALL FESCUE AS DETERMINED BY FISH ANALYSIS

Author
item Jenkins, Michael
item Franzluebbers, Alan

Submitted to: American Society of Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 7/17/2003
Publication Date: 11/4/2003
Citation: Jenkins, M., Franzluebbers, A.J. 2003. Microbial community structure under endophyte-free and endophyte-infected tall fescue as determined by fish analysis. American Society of Agronomy Abstracts. 503-jenkins724331-poster.

Interpretive Summary:

Technical Abstract: Endophyte-infected tall fescue appears to enhance soil carbon sequestration. The mechanisms accounting for this phenomenon have not been elucidated. We conducted short-term incubations of tall fescue with and without endophyte infection to detect differences in total bacterial counts and various bacterial kingdoms and subdivisions. We used published oligonucleotide probes and fluorescent in situ hybridization methodology to detect and quantify metabolically active Eubacteria, Archaea, high GC, Gram-positive bacteria, Cytophaga-Flavobacteria, Planctomycetes, and the Alpha-, Beta-, Gamma-, and Delta-Proteobacteria in both the bulk and rhizosphere soils of the two grasses. No differences were observed after week 36. After week 60 and an incomplete preliminary analysis, a significant decrease (at P < 0.05) was seen in the alpha-proteobacterial community associated with the rhizosphere soil of endophyte-infected tall fescue. These data suggest that the activity of certain components of the soil microbial community may be affected by the presence of the endophyte, and a reduction in bacterial activity may be one factor accounting for the enhanced accumulation of soil organic C.