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The concentration and composition of big sagebrush essential oils from Oregon |
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| Authors: | Rick G Kelsey William E Wright Forrest Sneva Al Winward Carlton Britton |
| Institution: | * Wood Chemistry Laboratory, Department of Chemistry, University of Montana, Missoula, MT 59812, U.S.A. † Water Quality Division, Wyoming Department of Environmental Quality, Lander, WY 82520, U.S.A. ‡ U.S. Department of Agriculture, Agricultural Research Service, Burns, OR 97720, U.S.A. § U.S. Department of Agriculture, Forest Service, Ogden, UT 84401, U.S.A. | Range and Wildlife Department, Texas Technical University, Lubbock, TX 79409, U.S.A. |
| Abstract: | The concentration of essential oils in big sagebrush foliage, Artemisia tridentata subsp. tridentata, subsp. vaseyana and subsp. wyomingensis collected from Oregon, differed significantly between individual shrubs with no correlation to geographic site, subspecies genotype, or plant age. Essential oil composition, measured by headspace analysis, was not affected by plant age, location of tissue within the crown, or geographic site. Six of 16 compounds differed quantitatively by subspecies, with wyomingensis and tridentata having nearly the same composition. Vaseyana could be recognized by its significantly lower concentration of acetone and methacrolein, two highly volatile, non-terpenoid, constituents. The implication of these results and those of recent studies are discussed in relation to herbivory. |
| Keywords: | Artemisia tridentata Anthemideae Asteraceae (Compositae) essential oils monoterpenes variation herbivory |
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