Fall armyworm (Lepidoptera: Noctuidae): practical resistance of 2 Brazilian populations to Cry1A.105 + Cry2Ab and Cry1F Bt maize

生物 夜蛾科 苏云金杆菌 粘虫 生殖器鳞翅目 美洲棉铃虫 农学 龄期 幼虫 混合的 夜蛾 苏力菌棉花 转基因玉米 有害生物分析 转基因作物 园艺 植物 转基因 基因 细菌 遗传学 重组DNA
作者
Silvana M Orozco‐Restrepo,Oscar F. Santos‐Amaya,Morgana de Souza Miranda,Clebson dos S Carneiro,E.J.G. Pereira
出处
期刊:Journal of Economic Entomology [Oxford University Press]
卷期号:117 (3): 1095-1105 被引量:3
标识
DOI:10.1093/jee/toae082
摘要

Abstract In the Americas, transgenic crops producing insecticidal proteins from Bacillus thuringiensis Berliner (Bt, Bacillales: Bacillaceae) have been used widely to manage fall armyworm (FAW, Spodoptera frugiperda [J.E. Smith]). As resistance to Cry1 single-gene Bt maize (Zea mays L.) rapidly evolved in some FAW populations, pyramided Bt maize hybrids producing Cry1, Cry2, or Vip3Aa proteins were introduced in the 2010s. We examined field-evolved resistance to single- and dual-protein Bt maize hybrids in 2 locations in southeastern Brazil, where plant damage by FAW larvae far exceeded the economic threshold in 2017. We collected late-instar larvae in Cry1A.105 + Cry2Ab and Cry1F maize fields and established 2 FAW populations in the laboratory. The F1 offspring reared on the foliage of Bt and non-Bt maize plants (Cry1A.105 + Cry2Ab and Cry1F) showed neonate-to-adult survival rates as high as 70% for both populations. There was no significant difference in the life-table parameters of armyworms reared on non-Bt and Bt maize foliage, indicating complete resistance to Cry1A.105 + Cry2Ab maize. Larval survival rates of reciprocal crosses of a susceptible laboratory strain and the field-collected populations indicated nonrecessive resistance to Cry1F and a recessive resistance to Cry1A.105 + Cry2Ab maize. When relaxing the selection pressure, the armyworm fitness varied on Cry1A.105 + Cry2Ab and non-Bt maize; the resistance was somewhat stable across 12 generations, without strong fitness costs, although one of the lines died confounded by a depleted-quality, artificial rearing diet. To our knowledge, this is the first report documenting the practical resistance of FAW to a pyramided Bt crop. We discuss the implications for resistance management.
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