Geographic variation in the monoterpene composition of Sitka spruce cortical oleoresin

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Abstract
The monoterpene composition of the cortical oleoresin from main stems and from branch apical shoots was measured in young trees of Piceasitchensis (Bong.) Carr. grown in Britain from seed collected from eight northwestern American origins. There was a high degree of variation within origins in both resin systems. Analysis of the individual monoterpene percentage data and of the representation of monoterpene pattern types showed that the Vancouver Island origin was the most distinct. There was a cline in several monoterpene characters, notably a decrease in β-phellandrene and an increase in 3-carene both by itself and also accompanied by limonene, from Alaska to north Washington, but the Washington and Oregon origins showed no geographical trends. The results are discussed in the context of the postglacial history of the species.

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