Clonal diversity in British populations of the alien invasive Giant Knotweed, Fallopia sachalinensis (F. Schmidt) Ronse Decraene, in the context of European and Japanese plants

Pashley, C.H.; Bailey, J.P.; Ferris, C.

Watsonia 26(Part 3): 359-371


Accession: 012954215

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Fallopia sachalinensis (F. Schmidt) Ronse Decracne was introduced to Europe during the 19th century, and whilst not as invasive as the notorious F. japonica var. japonica (Houtt.) Ronse Decraene, it is still an invasive plant capable of both clonal and sexual reproduction. It is also a significant pollen source for the male-sterile F. japonica var. J. japonica, producing the highly invasive hybrid F. xbohemica (Chrtek & Chrtkova) J. P. Bailey. Given the lack of diversity in F. japonica var. japonica, F. sachalinensis is a potentially important source for introducing novel variation into F. xbohemica. The majority of British F. sachalinensis was found to be one of two widespread genotypes, either a male-fertile or a male-sterile clone. In contrast there was a much higher level of genetic variation detected in both the rest of the introduced range and in the native range. Evidence is given for two separate introductions of native material into Britain; one from Niigata, Honshu, directly into Britain, and the other from Northern Japan, via St. Petersburg (Russia) to Europe.