Inhibition activity of essential oils obtained from Japanese trees against <Emphasis Type="Italic">Skeletonema costatum</Emphasis> |
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| Authors: | Kazuya Tsuruta Yayoi Yoshida Norihisa Kusumoto Nobuhiro Sekine Tatsuya Ashitani Koetsu Takahashi |
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| Institution: | (1) Forest Bio-Research Center, Forest and Forestry Product Research Institute (FFPRI), 3809-1 Ishi, Juo, Hitachi Ibaraki, 319-1301, Japan;(2) Forest Tree Breeding Center, FFPRI, 3809-1 Ishi, Juo, Hitachi Ibaraki, 319-1301, Japan;(3) Present address: Tohoku Regional Breeding Office, Forest Tree Breeding Center, FFPRI, 95 Ohsaki, Takizawa Iwate, 020-0173, Japan |
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| Abstract: | The growth inhibition activities of essential oils obtained from Cryptomeria japonica, Chamaecyparis obtusa, and Pinus thunbergii were examined against the bacillariophyceae Skeletonema costatum, also known as red tide plankton. The essential oils were extracted from the heartwood, leaves, and bark of these typical
indigenous Japanese conifers. The essential oils from C. japonica bark and P. thunbergii heartwood possessed strong growth inhibition activity. The chemical compositions of these essential oils were analyzed by
gas chromatography/flame ionization detection (GC-FID) and gas chromatography/mass spectrometry (GC-MS). α-Terpineol and longifolene were the main components of the essential oil from P. thunbergii heartwood. The C. japonica bark essential oil was mainly composed of α-terpineol, δ-cadinene, isophyllocladene, and ferruginol. Ferruginol and longifolene showed more potent growth inhibition against S. costatum than hinokitiol (β-thujaplicine), which is known to be a strong antifungal compound among wood components. Ferruginol and longifolene were important
factors for the growth inhibition activity of the essential oils from C. japonica bark and P. thunbergii heartwood, respectively. These results suggest the possibility of using C. japonica bark and P. thunbergii heartwood for the control of red tide plankton. |
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