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Philos Trans R Soc Lond B Biol Sci. 2003 Jun 29;358(1434):1163-70.

Current knowledge of gene flow in plants: implications for transgene flow.

Author information

1
Department of Botany and Plant Sciences, and Center for Conservation Biology, University of California, Riverside, CA 92521-0124, USA. ellstrand@ucrac1.ucr.edu

Abstract

Plant evolutionary biologists' view of gene flow and hybridization has undergone a revolution. Twenty-five years ago, both were considered rare and largely inconsequential. Now gene flow and hybridization are known to be idiosyncratic, varying with the specific populations involved. Gene flow typically occurs at evolutionarily significant rates and at significant distances. Spontaneous hybridization occasionally has important applied consequences, such as stimulating the evolution of more aggressive invasives and increasing the extinction risk for rare species. The same problems have occurred for spontaneous hybridization between crops and their wild relatives. These new data have implications for transgenic crops: (i) for most crops, gene flow can act to introduce engineered genes into wild populations; (ii) depending on the specific engineered gene(s) and populations involved, gene flow may have the same negative impacts as those observed for traditionally improved crops; (iii) gene flow's idiosyncratic nature may frustrate management and monitoring attempts; and (iv) intercrop transgene flow, although rarely discussed, is equally worthy of study.

PMID:
12831483
PMCID:
PMC1693201
DOI:
10.1098/rstb.2003.1299
[Indexed for MEDLINE]
Free PMC Article

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