Control effect of isobutyric acid on rice blast

벼 도열병에 대한 indole butyric acid(IBA)의 방제 효과

  • Kim, Heung-Tae (Dept. of Plant Medicine, Chungbuk National University) ;
  • Hong, Kyeong-Sik (Sustainable Chemical Technologies Division, Korea Research Institute of Chemical Technology) ;
  • Choi, Gyung-Ja (Drug Discovery Division, Korea Research Institute of Chemical Technology) ;
  • Jang, Kyung-Soo (Drug Discovery Division, Korea Research Institute of Chemical Technology) ;
  • Ryu, Choong-Min (Systems Microbiology Research Center, Korea Research Institute of Bioscience & Biotechnology)
  • 김홍태 (충북대학교 농업생명환경대학 응용생명환경학부 식물의학) ;
  • 홍경식 (한국화학연구원 의약화학연구센터) ;
  • 최경자 (한국화학연구원 바이오정밀화학연구센터) ;
  • 장경수 (한국화학연구원 바이오정밀화학연구센터) ;
  • 류층민 (한국생명공학연구원 시스템미생물연구센터)
  • Published : 2007.12.30


Nine plant growth regulators (PGRs) were tested for in vivo antifungal activities against on rice blast. They showed higher in vivo antifungal activities when they were applied on rice plants by soil drench rather than foliar spray. Except for 2,4-D at $500\;{\mu}g\;mL^{-1}$, the others showed a very low or no activity against the disease in foliar spray applications. In contrast, 2,4-D, indole butyric acid (IBA) and triiodobenzoic acid, at $500\;{\mu}g\;mL^{-1}$, showed control values of 98.9, 97.8 and 88.9% in soil drench applications. Furthermore, the control activity of IBA was dependent on its concentration against rice blast; IBA suppressed the development of rice blast by 71.7% at $125\;{\mu}g\;mL^{-1}$ and 85.8% at $250\;{\mu}g\;mL^{-1}$. IBA also controlled the development of rice blast on adult plants by 63.9% at a dosage of 2.56 kg/10a. The results revealed that IBA has a good activity against rice blast when it is applied by soil drench.


rice blast;plant growth regulator;isobutyric acid;soil-drenching application


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