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Coexistence in Maize: Effect of the Genetically Modified Maize Field Depth on Pollen-mediated Gene Flow

GND
1058990772
Affiliation
Julius Kühn-Institut (JKI), Federal Research Centre of Cultivated Plants, Institute for Crop and Soil Science, Braunschweig, Germany
Rühl, Gerhard;
GND
130200638
Affiliation
Julius Kühn-Institut (JKI), Federal Research Centre of Cultivated Plants, Institute for Crop and Soil Science, Braunschweig, Germany
Langhof, Maren

Although it is generally accepted that field depth of the recipient non–genetically modified (non-GM) neighboring maize (Zea mays L.) field is significantly affecting pollen-mediated gene flow, information about the influence of GM donor field depth is extremely scarce. Therefore, we investigated the effect of 75-m compared with 150-m donor field depth. In 2007 and 2008, one field experiment each was established in northern Germany at Mariensee. In both GM field depth variants, the distance between GM and non-GM maize field was 25 m. Sizes of non-GM maize fields were generally 1.5 ha, whereas two GM field sizes (1.5 and 3.0 ha) were compared in a field arrangement side-by-side oriented to favor pollen-mediated gene fl ow from GM to non-GM field. The GM percentages of individual samples taken at recipient fi eld depths between 0 and 60 m were quantified by realtime polymerase chain reaction. In both years, no difference in pollen-mediated gene fl ow in dependence on the two compared donor field depths was observed. Calculated GM contents of the total non-GM fields harvests were 1.4% (75 m) and 1.5% (150 m) in 2007 as well as 1.0% (both 75 and 150 m) in 2008. In consequence, maize pollen-mediated gene fl ow seems not to be considerably affected by GM field depth if fields are at least 75 m deep.

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