Horticultural Science & Technology (원예과학기술지)

Korean Society of Horticultural Science (한국원예학회)
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Role of a Phytotoxin Produced by Fusarium oxysporum f. sp. raphani on Pathogenesis of and Resistance to the Fungus

무 시들음병균이 생산하는 Phytotoxin의 병원성 및 저항성에서 역할

  • Shim, Sun-Ah (Research Center for Biobased Chemistry, Korea Research Institute of Chemical Technology) ;
  • Kim, Jin-Cheol (Research Center for Biobased Chemistry, Korea Research Institute of Chemical Technology) ;
  • Jang, Kyoung Soo (Research Center for Biobased Chemistry, Korea Research Institute of Chemical Technology) ;
  • Choi, Yong Ho (Research Center for Biobased Chemistry, Korea Research Institute of Chemical Technology) ;
  • Kim, Heung Tae (Department of Plant Medicine, Chungbuk National University) ;
  • Choi, Gyung Ja (Research Center for Biobased Chemistry, Korea Research Institute of Chemical Technology)
  • 심선아 (한국화학연구원 바이오화학연구센터) ;
  • 김진철 (한국화학연구원 바이오화학연구센터) ;
  • 장경수 (한국화학연구원 바이오화학연구센터) ;
  • 최용호 (한국화학연구원 바이오화학연구센터) ;
  • 김흥태 (충북대학교 식물의학과) ;
  • 최경자 (한국화학연구원 바이오화학연구센터)
  • Received : 2013.04.09
  • Accepted : 2013.06.07
  • Published : 2013.09.30
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Abstract

In the course of a developing screening method for resistant radish to Fusarium oxysporum f. sp. raphani, we found that the fungus produces phytotoxic compound against Raphanus sativus. The culture filtrate of F. oxysporum f. sp. raphani KR1 represented the strongest phytotoxicity when the fungus was incubated in the malt extract broth with 150 rpm at $25^{\circ}C$ for 14 days. Under bioassay-guided purification, we isolated a substance from liquid culture of F. oxysporum f. sp. raphani KR1, with phytotoxic effect against R. sativus. The compound was identified as fusaric acid by mass and nuclear magnetic resonance spectral analyses. Phytotoxicity of the compound against cruciferous vegetable crops, including radish, cabbage, and broccoli, was investigated. Fusaric acid represented phytotoxicity on radish seedlings by concentration dependant manner. And the phytotoxin demonstrated strong phytotoxicity on the resistant cultivars as well as susceptible cultivars of radish to F. oxysporum f. sp. raphani. In addition, fusaric acid isolated from the fungus also showed a potent phytotoxic efficacy against non-host Brassicaceae crops of the fungus such as cabbage and broccoli. The results demonstrate that fusaric acid produced by F. oxysporum f. sp. raphani is non-host-specific toxin and for screening of resistant radish to the fungal pathogen, spore suspension of the fungus without the phytotoxin has to be used.

무 시들음병에 대한 저항성 검정 체계를 확립하기 위하여 실험하는 과정에서 병원균인 Fusarium oxysporum f. sp. raphani가 무 유묘에 독성(phytotoxicity)을 일으키는 독소(phytotoxin)를 생산한다는 것을 발견했다. F. oxysporum f. sp. raphani KR1 균주는 여러 배지 중 malt extract broth 배지에서 배양하였을 때 그리고 $25^{\circ}C$에서 14일 동안 150rpm으로 진탕배양하였을 때 가장 많은 독소를 생산하였다. 무에 대한 독성 반응을 이용하여 F. oxysporum f. sp. raphani의 배양액으로부터 phytotoxin을 분리하였다. 그리고 Mass와 NMR Spectroscopy 분석을 통하여 이 화합물은 fusaric acid로 동정되었다. 독소의 역할을 규명하기 위하여 fusaric acid를 무, 양배추, 브로콜리 등 F. oxysporum f. sp. raphani의 기주 및 비기주 배추과 작물에 대한 독소 활성을 조사하였다. Fusaric aicd는 무 유묘에 대하여 농도 의존적으로 활성을 보였으며, F. oxysporum f. sp. raphani에 대한 감수성 품종뿐만 아니라 저항성 품종에 대해서도 유사한 정도의 독성을 나타냈다. 그리고 F. oxysporum f. sp. raphani가 생산하는 fusaric acid는 병원균의 비기주 배추과 작물인 양배추와 브로콜리에 대해서도 강한 활성을 보였다. 따라서 이들 결과는 이 독소가 병원성 관련 독소이나 비기주 특이적 독소이며, 무 시들음병 저항성 검정에서 이 독소가 제거된 포자현탁액을 접종원으로 사용해야 한다는 것을 나타낸다.

Keywords

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