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Selection for imidacloprid resistance and mode of inheritance in the brown planthopper, Nilaparvata lugens.

Pest Management Science 2019 January 31
BACKGROUND: Strong resistance to imidacloprid in Nilaparvata lugens (Stål) has developed in Southeastern and East Asia. Although the mode of inheritance for resistance is very useful information for pest control, this information is unknown in N. lugens. Here, we established two resistant strains that were selected from field populations in Vietnam and the Philippines and conducted crossing experiments to determine the inheritance pattern.

RESULTS: The resistance ratio of LD50 values for the two resistance-selected strains, i.e., resistant strains originating from Vietnam (VT-Res) and the Philippines (PH-Res), to their control strains were about 8- and 157-fold, respectively. Reciprocal cross experiments between the VT-Res and Susceptible strain (S-strain), and between the PH-Res and the S-strain showed that the degree of dominance was 0.81 and 0.82, and 0.95 and 0.96, respectively. Analysis of the F2 populations and backcrosses to the parental strains indicated that resistance is a major-gene trait following Mendelian inheritance. The strength of the resistance was suppressed by pre-treatment with piperonyl butoxide, an inhibitor of cytochrome P450-monooxygenases.

CONCLUSION: Our results suggest that imidacloprid resistance in N. lugens is autosomal and an almost completely-dominant major gene trait that is likely manifested by high expression levels of a detoxification enzyme. This article is protected by copyright. All rights reserved.

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