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Characteristics of resistance to chlorpyrifos in diamondback moth(Plutella xylostella L.) collected from Chinese cabbage alpine farmland at Gangwon-do, Korea  

Cho, Jun-Mo (Pioneer Co., Ltd.)
Kim, Kyung-Joo (Department of Biological Environment, College of Agriculture and Life Sciences, Kangwon National University)
Kim, Seong-Soo (Department of Biological Environment, College of Agriculture and Life Sciences, Kangwon National University)
Park, Hong-Ryeol (Department of Biological Environment, College of Agriculture and Life Sciences, Kangwon National University)
Lim, Chun-Keun (Department of Applied Biologies, Division of Bioresources Technology, College of Agriculture and Life Sciences, Kangwon National University)
Hur, Jang-Hyun (Department of Biological Environment, College of Agriculture and Life Sciences, Kangwon National University)
Publication Information
The Korean Journal of Pesticide Science / v.10, no.1, 2006 , pp. 50-55 More about this Journal
Abstract
A field-resistant strain of the diamondback-moth(Plutella xylostella L.), collected from Chinese cabbage alpine farmland at Gangwon-do, Korea, was used for determination of the characteristics of resistance to chlorpyrifos using the activities of esterases and glutathione-S-transferase(GST), protein sequestration and AChE insenstivity. Although the activities of esterases extracted from resistant strain and susceptible strain were not significantly different, isozyme bands shown on the electrophoresis were different. GST activity from field resistant strain was 1.5-fold higher than that of susceptible. No differences were shown between resistant and susceptible ones in protein sequestration. The insensitivities of AChE to chlorpyrifos, however, extracted from susceptible strain was 460-fold higher than those of resistant. These results indicated that the insensitivity of AChE is the major factor for developing the resistance and activities of GST might be a minor factor.
Keywords
AChE insensitivity; chlorpyrifos; diamondback-moth; esterases; glutathione-S-transferase; insecticide resistance; acetylcholinesterase(AChE);
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