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Gene flow from GM glyphosate-tolerant to conventional soybeans under field conditions in Japan

Published online by Cambridge University Press:  28 March 2007

Yasuyuki Yoshimura ,
Kazuhito Matsuo  and
Koji Yasuda
Yasuyuki Yoshimura
Affiliation:
National Institute for Agro-Environmental Sciences, Tsukuba, Ibaraki 305-8604, Japan
Kazuhito Matsuo
Affiliation:
National Institute for Agro-Environmental Sciences, Tsukuba, Ibaraki 305-8604, Japan
Koji Yasuda
Affiliation:
National Institute for Agro-Environmental Sciences, Tsukuba, Ibaraki 305-8604, Japan

Abstract

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Natural out-crossing rates were evaluated for conventional soybeans (Glycine max (L.) Merr.) cultivated adjacent to genetically modified (GM) glyphosate-tolerant soybeans under field conditions during a four-year period in Japan. A total of 107 846 progeny of 2772 plants harvested from conventional varieties were screened for glyphosate herbicide tolerance. The highest out-crossing rates, 0.19% in 2001 and 0.16% in 2002, were observed in adjacent rows 0.7 m from the pollen source. The highest rate in 2004 was 0.052%, which was observed at 2.1 m. No out-crossing was observed in the rows 10.5 m from the pollen source over the four-year period. The farthest distances between receptor and pollen source at which out-crossing was observed were 7 m in 2001, 2.8 m in 2002, and 3.5 m in 2004. The greatest airborne pollen density during the flowering period, determined by Durham pollen samplers located between the rows of each variety, was 0.368 grains.cm-2.day-1, with the average value at 0.18 grains.cm-2.day-1, indicating that the possibility of out-crossing by wind is minimal. Thrips species and predatory Hemiptera visited the soybean flowers more frequently during the four-year period than any other common pollinators, such as bees.

Keywords

gene flowsoybeanglyphosate-tolerantout-crossingpollen
Type
Research Article
Information
Environmental Biosafety Research , Volume 5 , Issue 3 , July 2006 , pp. 169 - 173
Copyright
© ISBR, EDP Sciences, 2007

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