AOBPreview originally published online on November 5, 2003
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Annals of Botany 93: 67-73, 2004
© 2004 Annals of Botany Company
Gene Flow from Cultivated Rice (Oryza sativa) to its Weedy and Wild Relatives
1 School of Biological Resources, College of Natural Resources, Yeungnam University, Kyongsan 712-749, South Korea, 2 The Center for Agricultural Biodiversity Research and Training of Yunnan Province, Yunnan Agricultural University, Kunming 650201, P R China and 3 The Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, Institute of Biodiversity Science, Fudan University, Shanghai 200433, P R China
* For correspondence. E-mail brlu{at}fudan.edu.cn
Received: 10 January 2003; Returned for revision: 17 June 2003; Accepted: 15 September 2003 Published electronically: 5 November 2003
• Background and Aims Transgene escape through gene flow from genetically modified (GM) crops to their wild relative species may potentially cause environmental biosafety problems. The aim of this study was to assess the extent of gene flow between cultivated rice and two of its close relatives under field conditions.
• Methods Experiments were conducted at two sites in Korea and China to determine gene flow from cultivated rice (Oryza sativa L.) to weedy rice (O. sativa f. spontanea) and common wild rice (O. rufipogon Griff.), respectively, under special field conditions mimicking the natural occurrence of the wild relatives in Asia. Herbicide resistance (bar) and SSR molecular finger printing were used as markers to accurately determine gene flow frequencies from cultivated rice varieties to their wild relatives.
• Key Results Gene flow frequency from cultivated rice was detected as between approx. 0·011 and 0·046 % to weedy rice and between approx. 1·21 and 2·19 % to wild rice under the field conditions.
• Conclusions Gene flow occurs with a noticeable frequency from cultivated rice to its weedy and wild relatives, and this might cause potential ecological consequences. It is recommended that isolation zones should be established with sufficient distances between GM rice varieties and wild rice populations to avoid potential outcrosses. Also, GM rice should not be released when it has inserted genes that can significantly enhance the ecological fitness of weedy rice in regions where weedy rice is already abundant and causing great problems.
Key words: Transgenic rice, weedy rice, wild rice, gene flow, outcross, microsatellite, herbicide resistance.
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