Graduation Year

2016

Date of Thesis Acceptance

Fall 12-11-2015

Major Department or Program

Biology

Advisor(s)

Heidi Dobson

Abstract

Arbuscular mycorrhizal fungi (AMF) form symbioses with most species of land plants, aiding the nutrient and water uptake of their hosts in exchange for sugars produced during photosynthesis. In addition to their host plants, AMF interact with many other soil organisms, whether being grazed on by fungivorous Collembola and oribatid mites or releasing compounds into the soil to change the community of decomposing microbes living there. Fungicides have been shown to inhibit AMF, and as golf courses rely heavily on fungicides in their management of turfgrass, this study aimed to determine the effects of these fungicide applications on the turfgrass-AMF symbiosis and identify any downstream effects. This was done by quantifying differences in AMF root colonization and spore density, activity of extracellular microbial enzymes involved in carbon and nutrient cycling, and Collembola and oribatid mite density between fungicidetreated and untreated golf courses, as well as in an undisturbed grassy meadow. AMF colonization of roots was significantly lower in fungicide-treated turfgrass, though spore abundance was not affected by treatment type and was higher in the meadow than in all golf courses. Microbial enzyme activity was not sensitive to fungicide application, but activity of several enzymes varied significantly by site. Six Collembola and oribatid taxa were found across the sites sampled. The mite superfamily Oppioidea was denser in the meadow, and the Collembola family Tomoceridae was found exclusively in the meadow. Decreased AMF root colonization due to long-term fungicide applications may decrease turfgrass water and nutrient uptake in the long run, the but full ecological effects of suppression of the AMF symbiosis merit further exploration.

Page Count

47

Subject Headings

Causation -- Environmental Aspects -- Soil, Roots (Botany) -- Ecology, Plant spores, Turfgrasses -- Management, Mites -- Identification -- Oppioidea, Collembola -- Type specimens, Endomycorrhizas -- Arbuscular mycorrhizal fungi (AMF), Vesicular-arbuscular mycorrhizas, Golf courses -- United States, Onondaga County (N.Y.), Ontario County (N.Y.), Oswego County (N.Y.), Whitman College 2016 -- Dissertation collection -- Biology Department

Permanent URL

http://hdl.handle.net/10349/20161251

Document Type

Whitman Community Accessible Thesis

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