Abstract
Monoterpene composition of xylem oleoresin from 139 Pinus ponderosa trees was determined by GLC, together with related parameters of turpentine content of oleoresin, oleoresin exudation pressure, oleoresin yield, and oleoresin propensity to crystallize. Although noncompositional variables correlated poorly or not at all inter se or with turpentine composition, stronger quantitative relationships were found to exist between individual monoterpenes. The results are discussed from the viewpoint of their relevance to the susceptibility of P. ponderosa to bark beetle attack, as well as from the viewpoint of terpene biosynthesis.
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