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Issue Environ. Biosafety Res. Volume 4, Number 4, October-December 2005 Page(s) 217 - 222 DOI 10.1051/ebr:2006003 Published online 22 June 2006

Environ. Biosafety Res. 4 (2005) 217-222
DOI: 10.1051/ebr:2006003

Monitoring the escape of transgenic oilseed rape around Japanese ports and roadsides

Hikaru Saji¹, Nobuyoshi Nakajima², Mitsuko Aono¹, Masanori Tamaoki², Akihiro Kubo¹, Seiji Wakiyama³, Yoriko Hatase³ and Masato Nagatsu<sup>3

1</sup>   Environmental Biology Division, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, 305-8506, Japan
²   Biodiversity Conservation Research Project, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, 305-8506, Japan
³   Japan Wildlife Research Center, 3-10-10 Shitaya, Taito-Ku, Tokyo, 110-8676, Japan

(Received August 24, 2005; accepted February 6, 2006; published online: 22 June 2006)

Abstract
An investigation was carried out to monitor the escape and spread of oilseed rape (Brassica napus) transgenic plants and the introgression of transgenes to its closely related feral species in Japan. We screened a total of about 7500 feral B. napus, 300 B. rapa, and 5800 B. juncea seedlings from maternal plants in 143 locations at several ports, roadsides, and riverbanks. The presence of glufosinate-resistance or glyphosate-resistance transgenes in these seedlings was confirmed by means of herbicide treatments and also immunochemical and DNA analyses. B. napus plants with herbicide-resistant transgenic seeds were found at five of six major ports and along two of four sampled roadsides in the Kanto District. Transgenic oilseed rape plants have not been commercially cultivated in Japan, suggesting that the transgenes would probably have come from imported transgenic seeds that were spilled during transportation to oilseed processing facilities. No transgenes were detected in seeds collected from B. napus plants growing along riverbanks in the Kanto District or in seeds from closely related species (B. rapa and B. juncea). To our knowledge, this is the first published example of feral, transgenic populations occurring in a nation where the transgenic crop has not been cultivated commercially.

Key words: Brassica / establishment / glufosinate / glyphosate / herbicide / introgression / transgenic plant

Corresponding author: Hikaru Saji hsaji@nies.go.jp

© ISBR, EDP Sciences 2006

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