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Herbicidal Characteristics of Soil Bacteria Actinomycetes G-0299 to Southern Crabgrass

토양 방선균 Actinomycetes G-0299의 바랭이에 대한 선택적 살초특성

  • Choi, Jung-Sup (Eco-friendly and New Materials Research Center, Korea Research Institute of Chemical Technology) ;
  • Kim, Young Sook (Eco-friendly and New Materials Research Center, Korea Research Institute of Chemical Technology) ;
  • Kim, Jae Deok (Eco-friendly and New Materials Research Center, Korea Research Institute of Chemical Technology) ;
  • Kim, Hye Jin (Eco-friendly and New Materials Research Center, Korea Research Institute of Chemical Technology) ;
  • Ko, Young-Kwan (Eco-friendly and New Materials Research Center, Korea Research Institute of Chemical Technology) ;
  • Park, Kee Woong (Department of Crop Science, Chungnam National University) ;
  • Moon, Surk-Sik (Department of Chemistry, Kongju National University)
  • Received : 2017.09.08
  • Accepted : 2017.09.26
  • Published : 2017.09.30

Abstract

An actinomycetes isolate G-0299 obtained from a forest soil showed strong phytotoxic activity to Digitaria ciliaris. For the foliar application study, the culture filtrate of the isolate G-0299 showed strong herbicidal activity only to D. ciliaris among the 12 monocot and 5 dicot weed species. And herbicidal activity at a concentration of 500, 250, 125 and $62.5{\mu}gmL^{-1}$ of culture filtrate was 100%, 98%, 70% and 40%, respectively. Phytotoxic symptoms of the culture filtrate by foliar application were desiccation and burn-down or bleaching of leaves and finally plant death. And then the herbicidal activity was exhibited only under the light condition. Also, chlorophyll loss of D. ciliaris leaf tissues in the light condition was much higher than in the dark condition and then chlorophyll content decreased 82%, 5%, respectively. In conclusion, our results suggest that soil bacteria, isolate G-0299 could be a good candidate for new bio-herbicide and provide a new lead molecule for a more unique herbicide.

방선균 G-0299의 살초특성을 확인하여 천연 제초제 후보소재로서의 가능성을 검토하고자 수행하였다. 선발된 방선균 G-0299는 바랭이에서만 살초력이 발휘되었을 뿐만 아니라 경엽처리 효과, 엽록소 함량 등의 생리 생화학적인 반응에서 광조건에서만 발현되는 독특한 살초특성을 보였다. 방선균 G-0299 배양 여액 농축 시료를 처리했을 때 속효성이며, 고사 또는 백화현상이 발현되는 등의 특징으로부터 광합성 저해 또는 protox 저해 제초제와 비슷한 작용기전을 갖고 있을 가능성을 유추해 볼 수 있겠으나 오직 바랭이에서만 살초력이 발휘되는 특이한 현상을 고려하면 상관성을 설명하기는 곤란하였다. 따라서 천연 제초활성 후보소재 방선균 G-0299의 보다 상세한 살초기 전에 관해서는 추가 연구를 통해 구명되어야 할 것이다.

Keywords

References

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