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The Science of Gene Flow in Agriculture and Its Role in Coexistence

Allen Deynze (), Kent J. Bradford (), Henry Daniell (), Joseph M. DiTomaso (), Nicholas Kalaitzandonakes (), Carol Mallory-Smith (), C. Neal Stewart (), Steven H. Strauss () and Rene Acker ()
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Allen Deynze: University of California-Davis
Kent J. Bradford: University of California-Davis
Henry Daniell: University of Pennsylvania
Joseph M. DiTomaso: University of California-Davis
Nicholas Kalaitzandonakes: University of Missouri
Carol Mallory-Smith: Oregon State University
C. Neal Stewart: University of Tennessee
Steven H. Strauss: Oregon State University
Rene Acker: University of Guelph

A chapter in The Coexistence of Genetically Modified, Organic and Conventional Foods, 2016, pp 13-37 from Springer

Abstract: Abstract Gene flow is a natural process that occurs among sexually-compatible individuals in which cross pollination can result in viable seeds. Gene flow between individuals within and among populations via pollen occurs only when they have concurrent geography, overlapping flowering times, and share common pollinators. Given a population size sufficient to avoid genetic drift, alleles that have neither positive nor negative impact on fitness will persist in the population at an allelic frequency equal to their introduction level. Alleles for genes conferring a fitness effect will be selected naturally for or against depending on the selection pressure. For example, the frequency of alleles conferring disease resistance may increase in the population in generations where a certain pathogen is prevalent but not when it is absent, while alleles conferring herbicide resistance will neither increase nor decrease in the population in areas where the herbicide is not used. Favorable genotypes for a certain trait are usually fixed at a more rapid rate in self-pollinating than in outcrossing species. Genetic and biological features such as polyploidy, fecundity, and generation time also affect shifts in allele frequencies.

Keywords: Gene Flow; Cytoplasmic Male Sterility; Transgenic Alfalfa; Seed Industry; Feral Plant (search for similar items in EconPapers)
Date: 2016
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DOI: 10.1007/978-1-4939-3727-1_2

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