Genetic survey of Pinus radiata. 8: Population differences in monoterpene composition of cortical oleoresin

Cortical oleoresin was taken from branches of young (c. 7-year-old) trees of Pinus radiata D.Don provenances for gas-liquid chromatograph analysis of monoterpenes. Two studies were undertaken: Study I involved 50 unrelated trees of each of the Californian mainland populations (Ano Nuevo, Monterey, and Cambria), Guadalupe Island, and Kaingaroa and Nelson from New Zealand; Study II involved 50 trees from each of the Guadalupe and Cedros Island populations. Monoterpene levels were expressed in percentages of total monoterpenes. Study I resolved seven frequent monoterpene peaks plus several other peaks that occurred infrequently, the levels of each peak varying widely both from tree to tree within populations and among population means. Several components showed indications of major gene effects. Multiple discriminant analysis, despite highly non-normal frequency distributions for most fractions, was a powerful tool for demonstrating patterns of population differences. Canonical variate distances were least between Cambria and Monterey, followed by those between Ano Nuevo and Monterey and between Cambri