Mode of inheritance and stability of resistance to Bacillus thuringiensis var kurstaki in a diamondback moth (Plutella xylostella) population from Malaysia |
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Authors: | Ali H Sayyed Juan Ferre Denis J Wright |
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Abstract: | Genetic inheritance of resistance to Bacillus thuringiensis var kurstaki (BTK) was examined in a diamondback moth (Plutella xylostella) population collected from the Melaka region of Malaysia. A BTK‐selected sub‐population (BTK‐SEL) which was more than 100‐fold resistant to BTK compared with a susceptible (ROTH) population of P xylostella was used with standard reciprocal crosses and back‐crosses between ROTH and BTK‐SEL. Logit regression analysis of F 1 reciprocal crosses indicated that BTK resistance was inherited as an incompletely recessive autosomal trait and controlled by a single locus. In contrast, other studies have shown that resistance to Cry1Ac is inherited as an incompletely dominant autosomal trait in a Cry1Ac‐selected sub‐population of the same Melaka population. The frequency of the allele responsible for resistance decreased without exposure to insecticide in the laboratory. © 2000 Society of Chemical Industry |
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Keywords: | Bacillus thuringiensis monogenic resistance incompletely recessive unstable allele Plutella xylostella |
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