Mode of inheritance and stability of resistance to Bacillus thuringiensis var kurstaki in a diamondback moth (Plutella xylostella) population from Malaysia

✍ Scribed by Ali H Sayyed; Juan Ferre; Denis J Wright

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 104 KB
• Volume: 56
• Category: Article
• ISSN: 1526-498X
• DOI: 10.1002/1526-4998(200009)56:9<743::aid-ps195>3.0.co;2-8

✦ Synopsis

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.