Abstract Samples of oleoresin were obtained from 811 slash pines by wounding the branch cortex. The trees comprised 16 clones and 45 control-pollinated families, produced from matings among 21 parents. Samples were analyzed by gas-liquid chromatography. Composition varied greatly among individualtrees, mostly as a result of genetic factors. Nongenetic effects included a slight decrease in the relative content of β-phellandrene with increasing time of sample storage. No effects of tree age, which varied from 2 to 20 years, could be shown. Variation in content of β-pineneand myrcene was concluded to be controlled by two alleles at a single locus, with high amounts being dominant over low. No evidence for the presence of linkage between the genes causing segregation for β-pinene and myrcene content was obtained. All of the major constituents (α-pinene,β-pinene, myrcene, and β-phellandrene) showed very strong broad-sense heritabilities and at least moderately strong narrow-sense heritabilities. Forest Sci. 17:381-387.
A. E. Squillace (Wed,) studied this question.
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