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Effective dominance of resistance of Spodoptera frugiperda to Bt maize and cotton varieties: implications for resistance management
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Effective dominance of resistance of Spodoptera frugiperda to Bt maize and cotton varieties: implications for resistance management
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Journal Article
Effective dominance of resistance of Spodoptera frugiperda to Bt maize and cotton varieties: implications for resistance management
2016
Overview
The resistance of fall armyworm (FAW),
Spodoptera frugiperda
, has been characterized to some Cry and Vip3A proteins of
Bacillus thuringiensis
(Bt) expressed in transgenic maize in Brazil. Here we evaluated the effective dominance of resistance based on the survival of neonates from selected Bt-resistant, heterozygous, and susceptible (Sus) strains of FAW on different Bt maize and cotton varieties. High survival of strains resistant to the Cry1F (HX-R), Cry1A.105/Cry2Ab (VT-R) and Cry1A.105/Cry2Ab/Cry1F (PW-R) proteins was detected on Herculex, YieldGard VT PRO and PowerCore maize. Our Vip3A-resistant strain (Vip-R) exhibited high survival on Herculex, Agrisure Viptera and Agrisure Viptera 3 maize. However, the heterozygous from HX-R × Sus, VT-R × Sus, PW-R × Sus and Vip-R × Sus had complete mortality on YieldGard VT PRO, PowerCore, Agrisure Viptera, and Agrisure Viptera 3, whereas the HX-R × Sus and Vip-R × Sus strains survived on Herculex maize. On Bt cotton, the HX-R, VT-R and PW-R strains exhibited high survival on Bollgard II. All resistant strains survived on WideStrike, but only PW-R and Vip-R × Sus survived on TwinLink. Our study provides useful data to aid in the understanding of the effectiveness of the refuge strategy for Insect Resistance Management of Bt plants.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
