Inheritance of Resistance to the Bacillus thuringiensis CrylC Toxin in Spodoptera littoralis (Lepidoptera: Noctuidae)

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Abstract:

A strain of Spodoptera littoralis Boisduval, selected for resistance to the Bacillus thuringiensis CryIC toxin, was used to analyze the inheritance of resistance. This strain resulted from a laboratory selection with spore-crystal preparations of B, thttringiensis CryIC toxin. At generation 12, resistance was >500 times the resistance ratio of the control. Dose-mortality curves of the resistant population, the susceptible strain, the F1 and the backcrosses from reciprocal crosses were compared. The resistance was partially recessive. F1 offspring from resistant males and susceptible females were more resistant than those from susceptible males and resistant females, indicating a clear paternal effect. Segregation of resistance was investigated in the 8 possible backcrosses between F1 and one of the parental strains. Dose-mortality responses significantly differed from those expected under the hypotheses of a major resistance gene that was either autosomal or sex linked. It was concluded that resistance was most probably polyfactorial. These results are discussed in relation to the nature of bacterial toxin resistance genes in various insects.

Document Type: Research Article

Publication date: August 1, 1997

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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