Taxonomic Implications of Monoterpene Compounds of Blue and Engelmann Spruces
The monoterpenes of cortical oleoresin collected from mature blue and Engelmann spruce have significant diagnostic potential in taxonomic studies of these species, while seedling cortical monoterpenes appear to be less useful. Cortical monoterpene compounds were analyzed in 38 blue and 13 Engelmann spruce in the Scotch Creek drainage in southwestern Colorado, and in their 6-months-old progeny. The objective was to explore the utility of monoterpenes in studying natural hybridization between the two species. Twenty-two compounds were detected in the cortical oleoresin of mature trees, twelve of which were identified. Species differences were generally quantitative, with most statistically significant. Blue spruce oleoresin contained higher levels of tricyclene, alpha-pinene, camphene, and bornyl acetate, while Engelmann spruce oleoresin contained higher levels of beta-pinene, 3-carene, terpinolene, and several unknown compounds. Monoterpene content of seedlings differed appreciably from that of mature parents. The large increase in beta-pinene in Engelmann spruce seedlings was the most striking. A discriminant function analysis of mature tree data distinguished between blue and Engelmann spruce with no misclassifications. Forest Sci. 32:725-734.
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Document Type: Journal Article
Affiliations: Professor, Department of Forestry, Michigan State University, East Lansing, MI 48824
Publication date: 1986-09-01
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