Contamination of Refuges by Transgenic Bt Cotton: Implications for Pink Bollworm (Lepidoptera: Gelechiidae) Resistance

Persistent Link:
http://hdl.handle.net/10150/193364
Title:
Contamination of Refuges by Transgenic Bt Cotton: Implications for Pink Bollworm (Lepidoptera: Gelechiidae) Resistance
Author:
Heuberger, Shannon Marlene
Issue Date:
2006
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
Refuges of non-Bt cotton are used to delay Bt resistance in the pink bollworm (Pectinophora gossypiella, Lepidoptera: Gelechiidae), a pest that eats cotton seeds. Contamination of refuges by transgenic Bt cotton could threaten the efficacy of such refuges by increasing the relative survival of larvae that carry alleles for Bt resistance. Here I compared contamination levels in refuges of varying configuration and distance from Bt. I found two types of contamination at low rates in refuges: outcrossing by Bt pollen and adventitious Bt plants. Unexpectedly, outcrossing did not differ between refuge configurations, and did not decrease as distance from Bt fields increased, perhaps because Bt plants in refuges acted as the main Bt pollen source. Bioassays, conducted to evaluate the impacts of contamination on pink bollworm resistance, indicated that Bt plants in refuges may increase the frequency of resistance alleles at a higher rate than outcrossing by Bt plants.
Type:
text; Electronic Thesis
Keywords:
pink bollworm; cotton; outcrossing; Bt; transgenic; contamination
Degree Name:
MS
Degree Level:
masters
Degree Program:
Entomology; Graduate College
Degree Grantor:
University of Arizona
Advisor:
Dennehy, Timothy J.; Carrière, Yves
Committee Chair:
Dennehy, Timothy J.; Carrière, Yves

Full metadata record

DC FieldValue Language
dc.language.isoENen_US
dc.titleContamination of Refuges by Transgenic Bt Cotton: Implications for Pink Bollworm (Lepidoptera: Gelechiidae) Resistanceen_US
dc.creatorHeuberger, Shannon Marleneen_US
dc.contributor.authorHeuberger, Shannon Marleneen_US
dc.date.issued2006en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractRefuges of non-Bt cotton are used to delay Bt resistance in the pink bollworm (Pectinophora gossypiella, Lepidoptera: Gelechiidae), a pest that eats cotton seeds. Contamination of refuges by transgenic Bt cotton could threaten the efficacy of such refuges by increasing the relative survival of larvae that carry alleles for Bt resistance. Here I compared contamination levels in refuges of varying configuration and distance from Bt. I found two types of contamination at low rates in refuges: outcrossing by Bt pollen and adventitious Bt plants. Unexpectedly, outcrossing did not differ between refuge configurations, and did not decrease as distance from Bt fields increased, perhaps because Bt plants in refuges acted as the main Bt pollen source. Bioassays, conducted to evaluate the impacts of contamination on pink bollworm resistance, indicated that Bt plants in refuges may increase the frequency of resistance alleles at a higher rate than outcrossing by Bt plants.en_US
dc.typetexten_US
dc.typeElectronic Thesisen_US
dc.subjectpink bollwormen_US
dc.subjectcottonen_US
dc.subjectoutcrossingen_US
dc.subjectBten_US
dc.subjecttransgenicen_US
dc.subjectcontaminationen_US
thesis.degree.nameMSen_US
thesis.degree.levelmastersen_US
thesis.degree.disciplineEntomologyen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorDennehy, Timothy J.en_US
dc.contributor.advisorCarrière, Yvesen_US
dc.contributor.chairDennehy, Timothy J.en_US
dc.contributor.chairCarrière, Yvesen_US
dc.contributor.committeememberTabashnik, Bruceen_US
dc.contributor.committeememberDegrandi-Hoffman, Gloriaen_US
dc.identifier.proquest1766en_US
dc.identifier.oclc659747524en_US
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