Document Detail

Spatial and temporal changes in genetic structure of greenhouse and field populations of cabbage looper, Trichoplusia ni.
MedLine Citation:
PMID:  20163547     Owner:  NLM     Status:  MEDLINE    
Trichoplusia ni is a subtropical moth that migrates annually from southern California to southern British Columbia, Canada where it invades vegetable greenhouses and field crops. The heated greenhouse environment has altered the natural extinction-recolonization dynamics of T. ni populations, and allows year-round persistence in some locations. In addition, the extensive use of the biopesticide, Bacillus thuringiensis subspecies kurstaki (Bt) in some greenhouses has selected for resistance. Here we investigated the genetic structure of T. ni populations in British Columbia greenhouses and in field populations in California and British Columbia using amplified fragment length polymorphisms (AFLP) as related to patterns of Bt resistance. The majority of British Columbia field populations were similar to the California field populations, the potential source of migrants. However populations in two geographic areas with high concentrations of greenhouses showed local genetic differentiation. Some of these populations experienced severe bottlenecks over-winter and following Bt sprays. Greenhouse populations showed a pattern of isolation by distance and a strong positive relationship between genetic differentiation and levels of Bt resistance. These patterns indicate that greenhouses that sometimes support year-round populations of T. ni and the ensuing strong bottlenecking effects following winter cleanups and Bt application cause genetic differentiation of T. ni populations. Long distance migrants to field populations contribute to genetic homogeneity of these.
Michelle T Franklin; Carol E Ritland; Judith H Myers
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-02-15
Journal Detail:
Title:  Molecular ecology     Volume:  19     ISSN:  1365-294X     ISO Abbreviation:  Mol. Ecol.     Publication Date:  2010 Mar 
Date Detail:
Created Date:  2010-05-11     Completed Date:  2010-06-28     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9214478     Medline TA:  Mol Ecol     Country:  England    
Other Details:
Languages:  eng     Pagination:  1122-33     Citation Subset:  IM    
Department of Zoology, University of British Columbia, 2370-6270 University Blvd., Vancouver, BC, Canada V6T 1Z4.
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MeSH Terms
Amplified Fragment Length Polymorphism Analysis
Animal Migration
Bacillus thuringiensis
Bayes Theorem
British Columbia
Cluster Analysis
Crops, Agricultural
Genes, Insect
Genetic Variation*
Genetics, Population*
Models, Genetic
Moths / genetics*
Pest Control, Biological
Sequence Analysis, DNA
Time Factors

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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