Abstract
Feral transgenic oilseed rape (Brassica napus) has been detected in central Japan. In this study, we investigated the distribution of transgenic oilseed rape and occurrence of hybridization of transgenic B. napus with feral populations of its closely related species (B. rapa and B. juncea) in the west of Japan in 2005. The progenies of 50 B. napus, 82 B. rapa and 283 B. juncea maternal plants from 95 sampling sites in seven port areas were screened for herbicide-resistance. Transgenic herbicide-resistant seeds were detected from 12 B. napus maternal plants growing at seven sampling sites in two port areas. A portion of the progeny from two transgenic B. napus plants had two kinds of herbicide-resistance transgenes. Therefore, two types of transgenic B. napus plants are likely to have outcrossed with each other. As found in the previous study, no transgenic seeds were detected from B. rapa or B. juncea.
