4.7 Article

Effects of cross-pollination among non-Bt and pyramided Bt corn expressing cry proteins in seed mixtures on resistance development of dual-gene resistant Helicoverpa zea

期刊

PEST MANAGEMENT SCIENCE
卷 78, 期 8, 页码 3260-3265

出版社

JOHN WILEY & SONS LTD
DOI: 10.1002/ps.6945

关键词

Bacillus thuringiensis; Helicoverpa zea; resistance; cross-pollination; seed mixture; dominance

资金

  1. USDA National Institute of Food and Agriculture [2017-33522-27090, 1013740]

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The study indicates that cross-pollination in mixed plantings may accelerate the emergence of dual-gene resistance in target insects like Helicoverpa zea to pyramided Bt corn in the USA, ultimately leading to the evolution of resistance to pyramided Bt crops.
BACKGROUND Seed mixture strategy can guarantee the compliance of planting non-Bt crops to host the susceptible insects for resistance management. However, pollen movement between Bt and non-Bt corn in the mixed plantings could reduce the efficacy of this strategy for ear-feeding insects. Few studies have evaluated the effects of cross-pollination among non-Bt and pyramided Bt corn in seed mixtures on the resistance development of insects possessing multiple resistances. Here, we provided the first study to investigate whether cross-pollination in mixed plantings of pyramided Bt corn producing Cry1A.105 and Cry2Ab2 would increase the dominance of resistance of dual-gene resistant populations of Helicoverpa zea, a target of pyramided Bt corn and cotton in the USA. RESULTS We compared the survival and development of susceptible, dual-gene resistant (resistance to both Cry1 and Cry2 proteins) and heterozygous genotypes of H. zea in the laboratory on non-Bt and pyramided Bt corn ears collected from mixed plantings and structured plantings in the field. We found higher fitness for F-1 heterozygous insects than for the susceptible insects of H. zea on both pyramided Bt corn and non-Bt corn in the mixed plantings. CONCLUSION These results suggest that cross-pollination in mixed plantings will significantly increase the dominance of resistance by supporting survival of heterozygous insects for dual-gene resistant populations of H. zea, and therefore accelerate evolution of resistance to pyramided Bt crops. (c) 2022 Society of Chemical Industry.

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