한국유기농업학회지 (Korean Journal of Organic Agriculture)

  • 제25권1호
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  • Pages.113-124
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  • 2017
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  • 1229-3571(pISSN)
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  • 2287-819X(eISSN)
한국유기농업학회 (Korean Association of Organic Agriculture)
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Beauveria bassiana 배양여액 분획추출물의 진딧물 살충활성

Aphicidal Activity of Different Fraction Extracts of Culture Filtrate of Beauveria bassiana Isolate against Aphids

  • 정가영 (농촌진흥청 국립농업과학원) ;
  • 한지희 (농촌진흥청 국립농업과학원) ;
  • 김정준 (농촌진흥청 국립농업과학원) ;
  • 이상엽 (농촌진흥청 국립농업과학원)
  • 투고 : 2016.10.21
  • 심사 : 2017.01.06
  • 발행 : 2017.02.28
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초록

목화진딧물과 복숭아혹진딧물은 채소를 포함한 다양한 작물에 큰 피해를 주는 해충이다. 이들 해충의 친환경 방제를 위해 진딧물에 병원성이 높은 곰팡이(B. bassiana) 유래 대사물질을 이용한 방제 연구를 수행하였다. 이 균주의 배양여액의 살충율은 목화진딧물에 처리 3일 후 100%, 복숭아혹진딧물에 처리 5일 후 99%였다. 이 추출물을 $CHCl_3$ : MeOH 비율을 달리하여 silica gel column chromatography 한 결과, 50:1 ($CHCl_3$ : MeOH)의 추출물 분획의 살충률이 목화진딧물과 복숭아혹진딧물에 각 80%와 75.4%로 다른 분획에 비해 현저하게 높았다. 또 각 용매비율별 추출물을 1:1로 혼합하여 처리한 결과, 분획 추출물 혼합에 의한 상승효과는 보이지 않았으며 두 진딧물에 모두 50:1 ($CHCl_3$ : MeOH) 단독처리에서 살충률(목화진딧물 77.3%, 복숭아혹진딧물 76.4%)이 가장 높았으며 50:1 + 70:1이 두 번째로 높았다(목화진딧물 72%, 복숭아혹진딧물 70.2%). 앞으로 안정적인 진딧물 방제를 위해 50:1 분획 추출물 내 진딧물 살충성 물질을 분리 동정 및 대량생산 연구를 진행할 예정이다.

Cotton aphid (Aphis gossypii) and green peach aphid (Myzus persicae) are serious pests damaging various crops including vegetables such as pepper, cucumber, and Chinese cabbage. We conducted a study to control two aphids with secondary metabolite of entomopathogenic fungus Beauveria bassiana. A B. bassiana was already selected as a high virulence isolate against cotton aphid and green peach aphid. The culture filtrate of the isolate showed high pathogenicity against both aphids as 100% mortality against cotton aphid 3 days after treatment and 99% against green peach aphid 5 days after treatment. A different fraction extracts with $CHCl_3$ : MeOH of B. bassiana culture filtrate (30:1, 50:1, 70:1, 90:1, 100:1; v/v) through silica gel column chromatography showed different control effect to aphids. Among them, 50:1 ($CHCl_3$ : MeOH) fraction had highest mortality as 77.3% and 75.4% against A. gossypii and M. persicae, respectively. A mixture of each fraction (1:1) had no synergistic effects because control effect of every mixture was lower than only 50:1 extract; for example, mortality of 50:1 + 70:1 showed $2^{nd}$ highest as 72% of cotton aphid and 70.2% of green peach aphid and other mixtures were lower than these values. In future we will study the identification and mass production of aphicidal compound isolated from 50:1 fraction to develop stable aphid control agent.

키워드

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