Assessing the Efficacy of Bacillus thuringiensis (Bt) Pyramided Proteins Cry1F, Cry1A.105, Cry2Ab2, and Vip3Aa20 Expressed in Bt Maize Against Lepidopteran Pests in Brazil

• Autor: Marques, Luiz H. ; Santos, Antonio C. ; Castro, Boris A. ; Moscardini, Valeria F. ; Rosseto, Jaedino ; Silva, Oscar A. B. N. ; Babcock, Jonathan M.
• Assuntos: Agrotis ipsilon ; Animals ; Bacillus thuringiensis ; Bacterial Proteins ; Brazil ; Bt gene ; Bt maize ; Diatraea saccharalis ; Elasmopalpus lignosellus ; Endotoxins ; Feeding ; Genetically engineered organisms ; Helicoverpa zea ; Hemolysin Proteins ; Hybrids ; INSECTICIDE RESISTANCE AND RESISTANCE MANAGEMENT ; Insecticides ; Larva ; Lepidoptera ; Moths ; Noctuidae ; Pests ; Plant protection ; Plants, Genetically Modified ; Proteins ; Seed treatments ; Technology ; Thiamethoxam ; Zea mays
• É parte de: Journal of economic entomology, 2019-03, Vol.112 (2), p.803-811
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• Descrição: Field studies across four states in maize-producing areas of Brazil were conducted to characterize the efficacy of a new pyramided Bacillus thuringiensis (Bt) Berliner technology in maize, Zea mays L., and compare it to existing single and pyramided commercial Bt technologies, to control Helicoverpa zea Boddie (Lepidoptera: Noctuidae), Elasmopalpus lignosellus Zeller (Lepidoptera: Pyralidae), Agrotis ipsilon (Hufnagel) (Lepidoptera: Noctuidae), and Diatraea saccharalis F. (Lepidoptera: Crambidae). Bt maize expressing Vip3Aa20 protein and pyramided Bt maize expressing proteins Cry1F + Cry1A.105 + Cry2Ab2 + Vip3Aa20 provided excellent protection against kernel feeding by H. zea compared to Bt technologies expressing only Cry1F or Cry1A.105 + Cry2Ab2. Bt maize expressing Cry1F, Cry1A.105 + Cry2Ab2, Cry1F + Cry1A.105 + Cry2Ab2, and Cry1F + Cry1A.105 + Cry2Ab2 + Vip3Aa20 resulted in less than 5% of plants injured by E. lignosellus, significantly less than Bt maize expressing only Vip3Aa20 and a non-Bt maize iso-hybrid with and without a thiamethoxam seed treatment. The highest protection against plant cutting injury caused by A. ipsilon was observed in the pyramid Bt maize technology expressing Cry1F + Cry1A.105 + Cry2Ab2 + Vip3Aa20. However, it did not differ statistically from the Bt maize expressing Vip3Aa20, Cry1F, or Cry1F + Cry1A.105 + Cry2Ab2. All Bt maize hybrids evaluated in our study were highly effective in reducing tunneling injury caused by D. saccharalis.These results show that a new maize technology expressing pyramided Bt proteins Cry1F + Cry1A.105 + Cry2Ab2 + Vip3Aa20 offers a higher level of protection from feeding by the above lepidopteran pest complex compared to maize with a single Bt protein or double pyramided Bt proteins.
  
• Editor: US: Entomological Society of America
  
• Idioma: Inglês