Seasonal and spatial variation in cortical monoterpene composition of Sitka spruce oleoresin

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Abstract
The monoterpene composition of the cortical oleoresin was studied in young trees of Piceasitchensis (Bong.) Carr., chosen to provide a wide range of chemical types. The cortical oleoresin systems of main stem and branch shoot apex differed from each other in composition, but for each system the variation within trees generally became significantly large only in basal and apical regions of the trees, with 3-carene showing the greatest variation. Blister oleoresin monoterpene composition was similar to that of the main stem. Seasonal changes in the composition of the main stem cortical oleoresin were insignificant. Young shoots immediately after flushing showed monoterpene compositions different from those of the previous year's mature shoots, and gradually reached the mature compositions during summer and early autumn. The nature of some of the differences, notably that of α-pinene, varied between trees. In most trees the new shoots contained relatively high concentrations of β-pinene and limonene; terpinolene was at very low concentration but had returned to normal levels after a month, while 3-carene gradually accumulated over a longer period sometimes extending into autumn.

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