Correlation of Est erase Isozymes to Malathion Resistance in the Small Brown Planthopper (Homoptera: Delphacidae)
Authors: SAKATA, KAZUYUKI; MIYATA, TADASHI
Source: Journal of Economic Entomology, Volume 87, Number 2, April 1994 , pp. 326-333(8)
Publisher: Entomological Society of America
Abstract:Variation of esterase and its importance to malathion resistance was investigated in the small brown planthopper, Laodelphax striatellus (Fallen). It was confirmed that increased activity of malathion carboxylesterase was one of the most important correlative factors for malathion resistance and that the insensitivity of acetylcholinesterase to malaoxon was a rather minor factor in the small brown planthopper. Increased carhoxylesterase activity was detected by aliesterase activity. Several aliesterase isozymes, which were separated by isoelectrofocusing, showed a high activity in the resistant strain. Among them, activities of two isozymes (pi = 5.3 and 5.0) were correlated with malathion resistance, and they were found to be able to hydrolyze both aliphatic esters and 14C-malathion. These two isozymes were found to be components of an E7 band separated by agar gel electrophoresis, a band already known to be controlled by a single, codominant, autosomal factor.
Document Type: Research Article
Publication date: April 1, 1994
- 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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