Abstract
Variations in the composition of low boiling point (LBP) monoterpenes emitted from needle samples of 150 hinoki (Chamaecyparis obtuse) trees (30 strains, each with five clones) native to Shimane Prefecture, Japan, were investigated using a headspace technique. The assays revealed considerable proportional variations especially in the amount of sabinene, which ranged from 24% to 78% of the total LBP monoterpenes. The proportions of α-pinene, myrcene, and limonene negatively correlated with that of sabinene overall. In particular, the proportion of limonene showed clear negative correlation with that of sabinene (r = −0.98). Differences in the proportion of sabinene among five clones in each strain were less than 15% in 22 out of 30 strains, indicating that monoterpene composition is constitutively steady in most strains. In a few strains, however, considerable variation in the composition was observed among clones.
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