Research in Plant Disease (식물병연구)

The Korean Society of Plant Pathology (한국식물병리학회)
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Development of Efficient Screening Method for Resistance of Cabbage to Fusarium oxysporum f. sp. conglutinans

양배추 시들음병에 대한 효율적인 저항성 검정법 개발

  • Baik, Song-Yi (Chemical Biotechnology Research Center, Korea Research Institute of Chemical Technology) ;
  • Kim, Jin-Cheol (Chemical Biotechnology Research Center, Korea Research Institute of Chemical Technology) ;
  • Jang, Kyoung-Soo (Chemical Biotechnology Research Center, Korea Research Institute of Chemical Technology) ;
  • Choi, Yong-Ho (Chemical Biotechnology Research Center, Korea Research Institute of Chemical Technology) ;
  • Choi, Gyung-Ja (Chemical Biotechnology Research Center, Korea Research Institute of Chemical Technology)
  • 백송이 (한국화학연구원 산업바이오화학연구센터) ;
  • 김진철 (한국화학연구원 산업바이오화학연구센터) ;
  • 장경수 (한국화학연구원 산업바이오화학연구센터) ;
  • 최용호 (한국화학연구원 산업바이오화학연구센터) ;
  • 최경자 (한국화학연구원 산업바이오화학연구센터)
  • Received : 2011.01.05
  • Accepted : 2011.01.11
  • Published : 2011.04.30
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Abstract

This study was conducted to establish the efficient screening method for resistant cabbage to Fusarium wilt caused by Fusarium oxysporum f. sp. conglutinans. The resistance degrees of nine commercial cabbage cultivars to the disease were evaluated. Among them, five cultivars (YR-honam, Ogane, Greenhot, Redmat, and Ccoccoma) showing different resistance to the fungus were selected. Then development of Fusarium wilt of the cultivars according to several conditions including root wounding, dipping period of roots in spore suspension, inoculum concentration, and incubation temperature to develop the disease was investigated. Highly resistant cultivars such as 'YR-honam' and 'Ogane' hardly showed change of resistance to the disease by root wounding, dipping period, and inoculum concentration, while disease severity of Fusarium wilt on the cultivars was changed with incubation temperatures ($20^{\circ}C$, $25^{\circ}C$ and $30^{\circ}C$). When the cabbage cultivars were incubated at $25^{\circ}C$, they represented the most difference of resistance and susceptibility to Fusarium wilt. From above results, we suggest that an efficient screening method for resistant cabbage to F. oxysporum f. sp. conglutinans is to dip the non-cut roots of 14-day-old seedlings in spore suspension of $1{\times}10^7$ conidia/ml for 0.5 hr and to transplant the seedlings to plastic pots with a fertilized soil, and then to cultivate the plants in a growth chamber at $25^{\circ}C$ for 3 weeks to develop Fusarium wilt.

Fusarium oxysporum f. sp. conglutinans에 의해 발생하는 양배추 시들음병에 대한 효율적인 저항성 검정법을 확립하기 위하여, 시판 중인 9종 양배추 품종의 시들음병에 대한 저항성을 실험하고 이로부터 저항성 정도가 다른 5종 품종(YR호남, 오가네, 그린핫, 레드마트, 꼬꼬마)을 선발하여 뿌리 상처 유무, 포자현탁액에 침지하는 시간, 접종원 농도 및 재배 온도에 따라 이들 품종의 시들음병에 대한 저항성 반응의 변화를 조사하였다. YR호남과 오가네와 같은 고도의 저항성 품종들은 뿌리 상처 유무, 접종원 농도 및 포자현탁액 침지 시간에 따라 시들음병 발생에 큰 차이를 보이지 않았다. 그러나 이들은 재배 온도에 따라 시들음병 발병도에 큰 변화를 나타냈으며, $25^{\circ}C$에서 재배하였을 때 저항성과 감수성의 차이가 가장 컸다. 따라서 양배추 시들음병에 대한 저항성을 효과적으로 검정하는 방법으로 양배추 종자를 파종하여 14일 동안 재배한 양배추 유묘의 뿌리로부터 흙을 제거하고, 이들을 F. oxysporum f. sp. conglutinans의 포자가 ml 당 $1{\times}10^7$개 농도의 포자현탁액에 30분 동안 침지한 후 원예용 상토에 이식하고, $25^{\circ}C$ 생육상에서 3주 동안 재배하는 방법을 제안한다.

Keywords

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