Allelochemicals produced by invasive plant, camphorweed and assessment of its adaptation in Japan

樟草（Heterotheca subaxillaris，紫菀科）广泛分布于美国，且该植物具有走廊般的气味，不受植食性昆虫的损害。初步探讨了防御系统的原因，发现有几个倍半萜类化合物对一种昆虫具有拒食活性。此外，在日本进行的盆栽试验中，还研究了在MS.U.S.收集的成分随植物发育的变化。当这种植物入侵日本时，其传播将受到限制，因为防御系统无法在日本栖息地有效。

Camphorweed (Heterotheca subaxillaris, Asteraceae) is widdely distributed in U.S., and this plant have a camphor-like odor without damage from phytophagous insect. The reason of defense system was investigated and a few sesquiterpenes showed insect antifeedant activity against a worm. Additionally, the pot test in Japan using collected in MS.U.S. was investigated that change of constituents with plant development. When this plant will invade in Japan, the spread of this will be limited, because the defense system can not be effective in Japanese habitat.