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

樟子草(Heterotheca subaxillaris，Asteraceae)在美国分布广泛，有一种类似樟脑的气味，不受植食性昆虫的危害。对其防御系统的原因进行了探讨，发现少数倍半萜类化合物具有拒虫拒食活性。此外，在日本的盆栽试验中，利用从美国MS收集的数据，研究了植物发育过程中化学成分的变化。当这种植物入侵日本时，这种植物的传播将受到限制，因为防御系统无法在日本人的栖息地有效。

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.