Abstract
Pollen mediated gene flow is the most widely debated biosafety issue in case of genetically modified crop plants and is a primary determining factor for permitting their field release, particularly major food crops like rice. The alleged consequences of gene escape into wild/weedy relatives that coexist together with cultivated forms in rice fields in several countries is perceived to be a major concern. In an effort to estimate the gene flow in rice in a tropical environment, rice varieties stacked with three bacterial blight (BB) resistance alleles and a cytoplasmic male sterile (CMS) line were used as donors and receiver of pollen respectively and the pollen flow was tracked with molecular markers that are closely linked to BB resistance genes. The study could detect gene flow up to 20 m distance with environmental factors like temperature and humidity influencing it. The gene flow observed at longer distances than the 10 m distance suggested earlier advocate caution and suggests that all the relevant biosafety issues need to be addressed prior to release of GM rice in tropical countries where sympatric association of wild relatives with cultivated rice with frequent crop-weedy gene flow both ways is quite common.
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Acknowledgements
The authors are highly grateful to the Director, Central Rice Research Institute, Cuttack for providing all the necessary facilities. The authors also express their sincere thanks to Dr. R. Sridhar for critical reading of the manuscript.
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Communicated by: Graham Bonnett
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Rao, G.J.N., Swain, D., Mishra, R. et al. Marker Based Estimation of Gene Flow in Tropical Rice Fields and Its Ecological Consequences. Tropical Plant Biol. 5, 277–285 (2012). https://doi.org/10.1007/s12042-012-9110-0
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DOI: https://doi.org/10.1007/s12042-012-9110-0