EFFECTS OF ETHYLENE ON THE MONOTERPENES EMITTED FROM HINOKI (CHAMAECYPARIS-OBTUSA) SEEDLINGS

We observed three increase patterns of emission amounts of monoterpene s when ethylene gas was injected into a glass house containing hinoki seedlings. The first was that the amounts of emissions increased only for sabinene (4 samples). The second was that only terpinolene increas ed (2 samples). The third was that both sabinene and terpinolene incre ased (3 samples). The emission amounts of sabinene increased immediate ly after ethylene gas was injected into the glass house. The emission amounts of terpinolene increased the following morning after the treat ment with ethylene gas. The emission amounts of both sabinene and terp inolene returned to ordinary values on the second day after the treatm ent with ethylene gas. It became clear that the action of ethylene gas on the emission amounts of monoterpenes was quick-responding and shor t-working. Because there were differences in the increasing times of t he emission amounts by ethylene gas between sabinene and terpinolene, two-staged defense responses by perceiving ethylene gas may be shown.