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- Title
- Investigation of ice encasement survival mechanisms and winter preparatory management strategies in annual bluegrass
- Creator
- Laskowski, Kevin
- Date
- 2019
- Collection
- Electronic Theses & Dissertations
- Description
-
"One aspect of the golf industry is turfgrass management. Annual bluegrass (Poa annua L.) is a golf course turfgrass species, often in a mixed stand with creeping bentgrass (Agrostis stolonifera). Many golf courses in the transition zone and north can be susceptible to ice or freeze injury to golf course putting greens. Annual bluegrass is more susceptible to ice cover damage than creeping bentgrass. In this thesis we aimed to evaluate mechanisms which could alleviate ice cover stress to...
Show more"One aspect of the golf industry is turfgrass management. Annual bluegrass (Poa annua L.) is a golf course turfgrass species, often in a mixed stand with creeping bentgrass (Agrostis stolonifera). Many golf courses in the transition zone and north can be susceptible to ice or freeze injury to golf course putting greens. Annual bluegrass is more susceptible to ice cover damage than creeping bentgrass. In this thesis we aimed to evaluate mechanisms which could alleviate ice cover stress to annual bluegrass through exogeneous applications of chemicals prior to ice cover through fatty acid analysis of annual bluegrass crown tissue. We also intend to examine the role of the plant growth hormone, ethylene, in annual bluegrass and its effects on ice cover survival. Applications of fungicides or plant growth regulators to golf course putting greens are common turfgrass management tools. Trinexapac-ethyl, Civitas, paclobutrazol, and propiconazole are commonly applied to golf course putting greens. Applications of trinexapac-ethyl decreased unsaturated fatty acids while increasing saturated fatty acids ratios in crown tissue of annual bluegrass while Civitas increased unsaturated fatty acids and decreased saturated fatty acids. This was correlated to ice cover recovery with Civitas increasing recovery and trinexapac ethyl decreasing recovery after ice cover. The gaseous hormone ethylene was then examined to determine its role in changes to fatty acid ratios of annual bluegrass under ice cover. Applications of effective ethylene chemicals decreased unsaturated fatty acid ratios while increasing saturated fatty acid ratios."--Pages ii-iii.
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- Title
- Effects of irrigation and traffic stresses on physiological responses and water use characteristics of creeping bentgrass and annual bluegrass
- Creator
- Laskowski, Kevin
- Date
- 2017
- Collection
- Electronic Theses & Dissertations
- Description
-
Creeping bentgrass (CBG; Agrostis stolonifera) and annual bluegrass (ABG; Poa annua) are two golf course putting green species that are sensitive to drought and traffic stress. A two-year field study evaluated the effects of irrigation treatments [8, 12, and 16% volumetric water content (VWC)] and traffic stress (none, low, and moderate) on CBG and ABG putting green plots. Leaf relative water content (RWC), leaf electrolyte leakage (EL), canopy chlorophyll content, normalized difference...
Show moreCreeping bentgrass (CBG; Agrostis stolonifera) and annual bluegrass (ABG; Poa annua) are two golf course putting green species that are sensitive to drought and traffic stress. A two-year field study evaluated the effects of irrigation treatments [8, 12, and 16% volumetric water content (VWC)] and traffic stress (none, low, and moderate) on CBG and ABG putting green plots. Leaf relative water content (RWC), leaf electrolyte leakage (EL), canopy chlorophyll content, normalized difference vegetative index (NDVI), root biomass, ethylene production, ABG invasion into CBG, quantity of water leached and soil VWC from plots were measured. A 12% irrigation treatment was determined to be optimal when compared to 8% (deficit) and 16% (excessive) when measuring leachate volumes and soil VWC. Moderate traffic treatments decreased turfgrass quality and increased ABG invasion into CBG plots. However, CBG had significantly higher turfgrass quality (through measuring RWC, EL, NDVI and chlorophyll content) than ABG under irrigation and traffic treatments. Ethylene gas production increased at the 8 and 16% irrigation treatment and increased in response to traffic treatments on ABG. The method of quantifying ethylene gas production in this study may be a practical technique to detect turfgrass stress incidence from putting green canopies. A more in depth analysis of ethylene gas production under other abiotic stress conditions may be necessary to investigate the role of ethylene gas within CBG and ABG.
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