Long-term monitoring of feral genetically modified herbicide-tolerant <i>Brassica napus</i> populations around unloading Japanese ports
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Genetically modified, herbicide-tolerant (GMHT) <i>Brassica napus</i> plants originating from seed spill have recently been found along roadsides leading from Japanese ports that unload oilseed rape. Such introductions have potential biodiversity effects (as defined by the Cartagena Protocol): these include replacement of native elements in the biota through competitive suppression or hybridization. We conducted surveys in the period 2006–2011 to assess such threats. We examined shifts in the population distribution and occurrence of GMHT plants in 1,029 volunteer introduced assemblages of <i>B. napus</i>, 1,169 of <i>B. juncea</i>, and 184 of <i>B. rapa</i> around 12 ports. GMHT <i>B. napus</i> was found around 10 of 12 ports, but its proportion in the populations varied greatly by year and location. Over the survey period, the distributions of a pure non-GMHT population around Tobata and a pure GMHT population around Hakata increased significantly. However, there was no common trend of population expansion or contraction around the 12 ports. Furthermore, we found no herbicide tolerant <i>B. juncea</i> and <i>B. rapa</i> plants derived from crosses with GMHT <i>B. napus</i>. Therefore, GMHT <i>B. napus</i> is not invading native vegetation surrounding its populations and not likely to cross with congeners in Japanese environment.
- Breeding Science
Breeding Science 65(3), 265-275, 2015
Japanese Society of Breeding