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Resistance Evolution to Bt Crops: Predispersal Mating of European Corn Borers

Over the past decade, the high-dose refuge (HDR) strategy, aimed at delaying the evolution of pest resistance to Bacillus thuringiensis (Bt) toxins produced by transgenic crops, became mandatory in the United States and is being discussed for Europe. However, precopulatory dispersal and the mating r...

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Autores principales: Dalecky, Ambroise, Ponsard, Sergine, Bailey, Richard I, Pélissier, Céline, Bourguet, Denis
Formato: Texto
Lenguaje:English
Publicado: Public Library of Science 2006
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1470457/
https://www.ncbi.nlm.nih.gov/pubmed/16719560
http://dx.doi.org/10.1371/journal.pbio.0040181
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author Dalecky, Ambroise
Ponsard, Sergine
Bailey, Richard I
Pélissier, Céline
Bourguet, Denis
author_facet Dalecky, Ambroise
Ponsard, Sergine
Bailey, Richard I
Pélissier, Céline
Bourguet, Denis
author_sort Dalecky, Ambroise
collection PubMed
description Over the past decade, the high-dose refuge (HDR) strategy, aimed at delaying the evolution of pest resistance to Bacillus thuringiensis (Bt) toxins produced by transgenic crops, became mandatory in the United States and is being discussed for Europe. However, precopulatory dispersal and the mating rate between resident and immigrant individuals, two features influencing the efficiency of this strategy, have seldom been quantified in pests targeted by these toxins. We combined mark-recapture and biogeochemical marking over three breeding seasons to quantify these features directly in natural populations of Ostrinia nubilalis, a major lepidopteran corn pest. At the local scale, resident females mated regardless of males having dispersed beforehand or not, as assumed in the HDR strategy. Accordingly, 0–67% of resident females mating before dispersal did so with resident males, this percentage depending on the local proportion of resident males (0% to 67.2%). However, resident males rarely mated with immigrant females (which mostly arrived mated), the fraction of females mating before dispersal was variable and sometimes substantial (4.8% to 56.8%), and there was no evidence for male premating dispersal being higher. Hence, O. nubilalis probably mates at a more restricted spatial scale than previously assumed, a feature that may decrease the efficiency of the HDR strategy under certain circumstances, depending for example on crop rotation practices.
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spelling pubmed-14704572006-06-13 Resistance Evolution to Bt Crops: Predispersal Mating of European Corn Borers Dalecky, Ambroise Ponsard, Sergine Bailey, Richard I Pélissier, Céline Bourguet, Denis PLoS Biol Research Article Over the past decade, the high-dose refuge (HDR) strategy, aimed at delaying the evolution of pest resistance to Bacillus thuringiensis (Bt) toxins produced by transgenic crops, became mandatory in the United States and is being discussed for Europe. However, precopulatory dispersal and the mating rate between resident and immigrant individuals, two features influencing the efficiency of this strategy, have seldom been quantified in pests targeted by these toxins. We combined mark-recapture and biogeochemical marking over three breeding seasons to quantify these features directly in natural populations of Ostrinia nubilalis, a major lepidopteran corn pest. At the local scale, resident females mated regardless of males having dispersed beforehand or not, as assumed in the HDR strategy. Accordingly, 0–67% of resident females mating before dispersal did so with resident males, this percentage depending on the local proportion of resident males (0% to 67.2%). However, resident males rarely mated with immigrant females (which mostly arrived mated), the fraction of females mating before dispersal was variable and sometimes substantial (4.8% to 56.8%), and there was no evidence for male premating dispersal being higher. Hence, O. nubilalis probably mates at a more restricted spatial scale than previously assumed, a feature that may decrease the efficiency of the HDR strategy under certain circumstances, depending for example on crop rotation practices. Public Library of Science 2006-06 2006-05-30 /pmc/articles/PMC1470457/ /pubmed/16719560 http://dx.doi.org/10.1371/journal.pbio.0040181 Text en Copyright: © 2006 Dalecky et al. http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.
spellingShingle Research Article
Dalecky, Ambroise
Ponsard, Sergine
Bailey, Richard I
Pélissier, Céline
Bourguet, Denis
Resistance Evolution to Bt Crops: Predispersal Mating of European Corn Borers
title Resistance Evolution to Bt Crops: Predispersal Mating of European Corn Borers
title_full Resistance Evolution to Bt Crops: Predispersal Mating of European Corn Borers
title_fullStr Resistance Evolution to Bt Crops: Predispersal Mating of European Corn Borers
title_full_unstemmed Resistance Evolution to Bt Crops: Predispersal Mating of European Corn Borers
title_short Resistance Evolution to Bt Crops: Predispersal Mating of European Corn Borers
title_sort resistance evolution to bt crops: predispersal mating of european corn borers
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1470457/
https://www.ncbi.nlm.nih.gov/pubmed/16719560
http://dx.doi.org/10.1371/journal.pbio.0040181
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