The Korean Journal of Pesticide Science (농약과학회지)

The Korean Society of Pesticide Science (한국농약과학회)
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In vivo Metabolism of Flupyrazofos into Plutella xylostella (Lepidoptera: Yponomeutidae) and Spodoptera exigua (Lepidoptera: Noctuidae)

배추좀나방과 파밤나방의 채내에서 Flupyrazofos의 대사

  • Lee, Sang-Guei (National Institute of Agricultural Science and Technology, Rural Development Administration) ;
  • Lee, Hoi-Seon (Division of Applied Biotechnology, College of Agriculture, Chonbuk National University) ;
  • Hwang, Chang-Yeon (Department of Agricultural Biology, Chonbuk National University) ;
  • Han, Man-Jong (National Institute of Agricultural Science and Technology, Rural Development Administration) ;
  • Park, Hyung-Man (National Institute of Agricultural Science and Technology, Rural Development Administration)
  • Published : 2002.09.30
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Abstract

In vivo metabolism study was carried out to find out the biochemical or metabolic tolerance mechanism between Diamond backmoth (DBM), Plutella xylostella and Beet armywarm (BAW), Spodoptera exigua to flupyrazofos. They showed some differences between the DBM and BAW. About 20% of flupyrazofos applied to the 3rd instar larvae of DBM was metabolized within 1 h and about 50% of that was metabolized within 4 h. The metabolites of flupyrazofos-oxon in 3rd instar larvae of DBM were increased 10 times more at 4 h than 1 h after application. The amounts of flupyrazol were nearly same between at 1 h and 4 h. The amount of unknown and origin increased 2 and 3 times more at 1 h than 4 h after application, respectively. In the 4th instar BAW larva, about 50% of flupyrazofos was metabolized within 1 h and about 70% of that was metabolized within 4 h. As metabolites, the amounts of flupyrazofos-oxon increased 2 times more at 4 h than 1 h after application. The amounts of flupyrazol increased 4 times more at 4 h than 1 h after application. The amount of unknown and origin increased 2.5 and 2 times more at 4 h than 1 h after application, respectively. From the study, it is supposed that hydrolytic enzyme, esterase, cleave the alkyl bond of flupyrazofos and conjugates with flupyrazofos. This seems to be the main tolerance mechanism of BAW to flupyrazofos.

배추좀나방과 파밤나방에 대한 flupyrazofos의 작용기작을 구명하기 위하여 한국화학연구소에서 분양을 받아 실내에서 19세대 누대 사육한 배추좀나방과 포장에서 채집하여 실내에서 인공사료를 이용하여 25세대 누대 사육한 파밤나방을 대상으로 $^{14}C$-flupyrazofos를 처리하여 두 종간의 생체내 대사물을 조사한 결과는 다음과 같다. flupyrazofos의 생체내 대사물은 flupyrazofos-oxon, flupyrazol, unknown으로 분리되었으며, 대사량은 약제처리 1시간 후와 4시간 후에 배추좀나방에서 flupyrazofos가 80.3%와 53.5%, flupyrazofos-oxon이 0.5%와 5.3%, flupyrazol이 1.1%와 1.3%, unknown이 4.5%와 11.6%, 전개되지 않은 물질이 5.3%와 18.5%이었고, 파밤나방에서 flupyrazofos가 48.0%와 23.8%, flupyrazofos-oxon이 1.3%와 3.2%, flupyrazol이 4.8%와 16.0%, unknown이 11.0%와 26.5%, 전개되지 않은 물질이 13.7%와 23.1%이었다. 따라서 시간이 경과할수록 flupyrazofos-oxon이 배추좀나방에서는 크게 증가한 반면 파밤나방에서는 적게 증가하였고, 배추좀나방에서는 flupyrazol, unknown, 전개되지 않은 물질 등이 상대적으로 적은 반면 파밤나방에서는 상대적으로 많았다. 이상의 결과로 볼 때 파밤나방에서는 일반적으로 곤충에서 생화학적 저항성 기구로 잘 알려진 가수분해효소의 일종인 esterase의 활성이 증가하여 alkyl 결합을 끊어 무독화 시키거나 flupyrazofos와의 결합체 역할이 강하게 작용하는 것으로 판단된다.

Keywords

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