Resistência de Spodoptera frugiperda (J. E. Smith) (Lepidoptera: Noctuidae) a eventos "piramidados" de milho que expressam proteínas inseticidas de Bacillus thuringiensis Berliner

Bernardi, Daniel

doi:10.11606/t.11.2015.tde-28042015-105744

Cited by 1 publication

(5 citation statements)

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“…In contrast, the Bt-susceptible FAW strain (Sus) showed complete mortality on all Bt maize and cotton varieties tested. These results demonstrate that Bt resistance is largely genetic, as found in previous studies 6 20 21 30 . In addition, the HX-R strain also survived on YieldGard VT PRO and PowerCore maize, and the VT-R and PW-R strains survived on Herculex maize.…”

Section: Discussionsupporting

confidence: 89%

“…The strain resistant to the YieldGard VT PRO (Cry1A.105 and Cry2Ab2) and the PowerCore (Cry1A.105, Cry2Ab2 and Cry1F) maize varieties was selected in the laboratory from positive F 2 screening tests of field populations as described by Bernardi et al 16 20 . After selection, the resistant strains were reared for nine generations on the respective maize event.…”

Section: Methodsmentioning

confidence: 99%

“…The resistance ratios of the VT-R and PW-R strains to the Cry1F, Cry1A.105 and Cry2Ab2 proteins were greater than 2700-, 3300- and 10-fold, respectively. The inheritance of the resistance was characterized as autosomal recessive and polygenic 16 20 .…”

Section: Methodsmentioning

confidence: 99%

“…The heterozygous strains were obtained from a reciprocal cross of resistant♀ × Sus♂, with at least 40 pairs. In the bioassays, only the F 1 progeny of these crosses were used because inheritance of resistance is not sex-linked in any of the resistant strains, and the heterozygous insects showed similar mortality and growth inhibition responses to the Sus strain in diet-overlay bioassays 6 16 20 21 .…”

Section: Methodsmentioning

confidence: 99%

“…This species has also developed resistance to Cry1F maize in Puerto Rico 19 and in some areas of the southeastern United States 13 . Laboratory studies have also indicated the resistance of FAW to YieldGard VT PRO maize, which expresses Cry1A.105/Cry2Ab2 12 16 ; PowerCore maize, which expresses Cry1A.105/Cry2Ab2/Cry1F 20 ; and Agrisure Viptera and Agrisure Viptera 3 maize, which express Vip3Aa20 and Vip3Aa20/Cry1Ab 21 , respectively. The laboratory selection of these resistant strains from field populations of FAW is indicative of the presence of resistance alleles in the field, which reveals a potential risk of the evolution of resistance if resistance management strategies are neglected.…”

mentioning

confidence: 99%

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Effective dominance of resistance of Spodoptera frugiperda to Bt maize and cotton varieties: implications for resistance management

Horikoshi

Bernardi

et al. 2016

Sci Rep

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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.

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