Studiy of adaptiogenesis with expansion of distribution of invasive alian species from Japan

本研究是一种在日本及其周边地区野生生长的日本结缕草，在19世纪后被人工引入西方。现在，日本虎杖及其亲缘种巨型虎杖和波西米亚虎杖已经成为入侵外来物种的问题。我们在日本、韩国、台湾等地的自然栖息地进行了广泛的调查。还有入侵地区英格兰和欧罗巴，北美东海岸和西海岸的样本。我们比较了叶绿体DNA rbcL-accD区和细胞核DNA ITS区的DNA序列。叶绿体DNA rbcL-accD区有5组，核DNA ITS区有6组。欧美入侵日本结缕草rbcL-accD和ITS区序列相同。认为欧洲和美洲入侵日本虎杖属同源，原产于日本（日本海沿岸地区）。入侵的虎杖草与日本虎杖草也有亲缘关系。

This research is a Japanese knotweed which grows wild in the Japan and its surrounding area, will be artificially introduced into the West after the 19th century. Now, Japanese knotweed and its allied species Giant knotweed, and Bohemian knotweed has been a problem as invasive alien species. We investigated in the wide area in the natural habitat, Japan, South Korea, and Taiwan. And also sampled invasion area England and Europa, East and West Coast of North America. We compared DNA sequence of rbcL-accD region of chloroplast DNA, and ITS region of nuclear DNA. There are 5 groups of rbcL-accD region of chloroplast DNA, and divide into 6 groups in ITS region of nuclear DNA. The both european and american invasive Japanese knotweed have same sequence of rbcL-accD and ITS region. It is considered that both European and American invasive Japanese knotweed are same origin from Japan (Japan sea side region). The invasive Giant knotweed is also related with Giant knotweed from Japan.