Gene flow among three Brasscia species coexisted in natural vegetation

Matsuo, Kazuhito; Itoh, Kouji

doi:10.3719/weed.46.supplement_224

Cited by 2 publications

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“… Scheffler and Dale (1994) reported that B. juncea shows the second highest crossability with B. napus after B. rapa . Moreover, investigations on Hortus siccus revealed that the flowering periods of B. juncea and B. napus in Japan completely overlap ( Matsuo and Itoh 2001 ) and that B. juncea is distributed in all prefectures of Japan ( Abe et al 2004 , Hokkaido 2010 , Kanai et al 2008 , Konta et al 2006 , MAFF 2012 , MLIT 2005 , National Museum of Nature and Science 2000 , Tsuda and Tabei 2014 ). Under these conditions, some feral GM canola cultivars have been identified each year since it was initially reported in 2003 ( MAFF 2012 ).…”

Section: Conclusion and Remarksmentioning

confidence: 99%

“…However, spontaneous hybridization is generally difficult because B. juncea is a self-compatible species ( Ohsawa and Namai 1987 , Tsuda et al 2012a ) reported that hybridization frequency under isolated conditions between the donor and the recipients was 0.05% at a distance of 1 m and 0.03% at a distance of 17.5 m, and no hybrids were observed under more distant isolated conditions, ranging from 20 to 27.5 m. These results also indicate the difficulty of hybridization when B. juncea is isolated from B. napus . In Japan, it has been previously reported that the flowering period of B. juncea and B. napus overlap ( Matsuo and Itoh 2001 ). However, when the flowering period of the donor and the recipient completely overlapped, the spontaneous hybridization frequency of B. juncea × B. napus was not high compared with that of B. rapa × B. napus ( Tsuda et al 2012a ).…”

Section: Introgression From B Napus To mentioning

confidence: 99%

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Possibilities of direct introgression from Brassica napus to B. juncea and indirect introgression from B. napus to related Brassicaceae through B. juncea

2014

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The impact of genetically modified canola (Brassica napus) on biodiversity has been examined since its initial stage of commercialization. Various research groups have extensively investigated crossability and introgression among species of Brassicaceae. B. rapa and B. juncea are ranked first and second as the recipients of cross-pollination and introgression from B. napus, respectively. Crossability between B. napus and B. rapa has been examined, specifically in terms of introgression from B. napus to B. rapa, which is mainly considered a weed in America and European countries. On the other hand, knowledge on introgression from B. napus to B. juncea is insufficient, although B. juncea is recognized as the main Brassicaceae weed species in Asia. It is therefore essential to gather information regarding the direct introgression of B. napus into B. juncea and indirect introgression of B. napus into other species of Brassicaceae through B. juncea to evaluate the influence of genetically modified canola on biodiversity. We review information on crossability and introgression between B. juncea and other related Brassicaseae in this report.

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Section: Conclusion and Remarksmentioning

confidence: 99%

Section: Introgression From B Napus To mentioning

confidence: 99%

Possibilities of direct introgression from Brassica napus to B. juncea and indirect introgression from B. napus to related Brassicaceae through B. juncea

2014

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Long-term monitoring of feral genetically modified herbicide-tolerant Brassica napus populations around unloading Japanese ports

et al. 2015

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Genetically modified, herbicide-tolerant (GMHT) Brassica napus 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 B. napus, 1,169 of B. juncea, and 184 of B. rapa around 12 ports. GMHT B. napus 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 B. juncea and B. rapa plants derived from crosses with GMHT B. napus. Therefore, GMHT B. napus is not invading native vegetation surrounding its populations and not likely to cross with congeners in Japanese environment.

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Gene flow among three Brasscia species coexisted in natural vegetation

Cited by 2 publications

References 0 publications

Possibilities of direct introgression from <i>Brassica napus</i> to <i>B. juncea</i> and indirect introgression from <i>B. napus</i> to related Brassicaceae through <i>B. juncea</i>

Possibilities of direct introgression from <i>Brassica napus</i> to <i>B. juncea</i> and indirect introgression from <i>B. napus</i> to related Brassicaceae through <i>B. juncea</i>

Long-term monitoring of feral genetically modified herbicide-tolerant <i>Brassica napus</i> populations around unloading Japanese ports

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