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- Title
Characterization of field-evolved resistance to Bacillus thuringiensis-derived Cry1F 휹-endotoxin in Spodoptera frugiperda populations fromArgentina.
- Authors
Chandrasena, Desmi I.; Signorini, Ana M.; Abratti, Gustavo; Storer, Nicholas P.; Olaciregui, Magdalena L.; Alves, Analiza P.; Pilcher, Clinton D.
- Abstract
BACKGROUND: Transgenic maize (Zea mays L.) event TC1507 (Herculex® I insect protection), expressing Cry1F 휹-endotoxin derived from Bacillus thuringiensis var. aizawai, was commercialized in 2003 in the Americas. Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) susceptibility to Cry1F was monitored annually across several regions in Argentina using diagnostic concentration bioassays. Reduced performance of TC1507 maize against S. frugiperda was reported in 2013. A resistant population was established in the laboratory and the dominance of Cry1F resistance was characterized. RESULTS: During 2012–2015, high-survivorship of several populations was observed in the resistance monitoring program. Reciprocal crosses of a Cry1F-resistant population with a Cry1F-susceptible population were evaluated to calculate effective dominance (DML) based on mortality levels observed at 100 훍g/ml Cry1F. Two additional dominance levels (DLC and DEC) were calculated using lethal (LC50) or effective concentration (EC50) derived from concentration–response bioassays. Estimates indicated that Cry1F resistance in S. frugiperda in Argentina was either highly recessive (DML =0.005) or incompletely recessive (DLC <0.26 and DEC <0.19). CONCLUSION: This study is the first documented confirmation and characterization of S. frugiperda Cry1F field-evolved resistance in Argentina. The resistance to Cry1F in S. frugiperda populations collected in Argentina, is autosomal and incompletely recessive similar to the resistance reported in Brazil. © 2017 The Authors. Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
- Subjects
ARGENTINA; BACILLUS thuringiensis genetics; ENDOTOXIN analysis; FALL armyworm; BT corn; BIOLOGICAL assay
- Publication
Pest Management Science, 2018, Vol 74, Issue 3, p746
- ISSN
1526-498X
- Publication type
Article
- DOI
10.1002/ps.4776