Abstract
Seasonal variations of the leaf oil contents and the amounts of terpene emission of Cryptomeria japonica, Chamaecyparis obtusa, Abies sachalinensis, Thuja occidentalis, Thuja standishii, Cupressus sempervirens and Cinnamomum japonicum were studied. The leaf oil contents and the amounts of terpene emission were high in summer and low in winter. It was suggested that the terpene emission varied with leaf oil production. The amounts of terpene emission from C. obtusa were higher at 30°C than 15°C either in the light or in the dark and they were also higher in the light than in the dark. The amounts of terpene emission increased by the forced emission method by which three seedlings on pots were rotated by touching each other's leaves and the amounts of terpenes reached 3 to 35 μg/(g(grams dry weight) · h). The individuals of varieties of C. obtusa seedlings whose quantities of terpene emission were high were selected to propagate these individuals.
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