Research in Plant Disease (식물병연구)

The Korean Society of Plant Pathology (한국식물병리학회)
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Development of Efficient Screening Method for Resistant Cabbage and Broccoli to Plasmodiophora brassicae

양배추 및 브로콜리 뿌리혹병에 대한 효율적인 저항성 검정 방법 확립

  • Jo, Su-Jung (Research Center for Biobased Chemistry, Korea Research Institute of Chemical Technology) ;
  • Shim, Sun-Ah (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, Jin-Cheol (Research Center for Biobased Chemistry, Korea Research Institute of Chemical Technology) ;
  • Choi, Gyung-Ja (Research Center for Biobased Chemistry, Korea Research Institute of Chemical Technology)
  • 조수정 (한국화학연구원 바이오화학연구센터) ;
  • 심선아 (한국화학연구원 바이오화학연구센터) ;
  • 장경수 (한국화학연구원 바이오화학연구센터) ;
  • 최용호 (한국화학연구원 바이오화학연구센터) ;
  • 김진철 (한국화학연구원 바이오화학연구센터) ;
  • 최경자 (한국화학연구원 바이오화학연구센터)
  • Received : 2012.03.02
  • Accepted : 2012.06.08
  • Published : 2012.06.30
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Abstract

Clubroot caused by Plasmodiophora brassicae Woron. is one of the most important diseases in Brassica crops worldwide. To establish more simple and reliable screening method for resistant cabbage and broccoli to P. brassicae, the development of clubroot on the plants according to inoculum concentration and incubation period after inoculating with the pathogen was investigated using P. brassicae GN1 isolate (race 9). To facilitate and acquire precise result of resistance screening of cabbage and broccoli to clubroot, 14-day-old seedlings were inoculated by drenching roots with the spore suspension of P. brassicae to give inoculum density of $2.5{\times}10^9$ spores/pot. To develop the disease, the inoculated seedlings were incubated in a growth chamber at $20^{\circ}C$ for 3 days, and then cultivated in a greenhouse ($20{\pm}5^{\circ}C$) for five weeks. Under the optimum conditions, 16 cabbage and 17 broccoli cultivars were tested for resistance to four field isolates (GN1, GN2, GS and YC) of P. brassicae collected from four regions in Korea. Among them, some cabbage and broccoli cultivars showed different resistance response to three isolates (GN1, GN2 and GS) determined as race 9 by using the differential varieties of Williams. On the other hand, all the tested cultivars were highly susceptible to YC isolate (race 2). The results suggest that this method is efficient screening method of cabbage and broccoli for resistance to P. brassicae.

Plasmodiophora brassicae Woron.에 의한 뿌리혹병은 배추과 작물에 발생하는 전 세계적으로 가장 중요한 식물병 중 하나이다. 본 연구는 Brassica oleracea에 속하는 양배추와 브로콜리의 뿌리혹병에 대한 효율적인 저항성 검정 방법을 확립하기 위하여, 레이스 9인 GN1 균주를 이용하여 접종원의 농도와 P. brassicae 접종 후 배양 기간 등의 발병 조건에 따른 양배추와 브로콜리 뿌리혹병 발생을 조사하였다. 접종원의 농도는 14일 재배한 유묘에 포트 당 $2.5{\times}10^9$개의 포자를 접종하는 것이 적당하였으며, 안정적인 발병을 위하여 접종한 유묘는 3일 동안 $20^{\circ}C$ 생육상에서 하루에 12시간 광을 처리하며 배양하고, 그 후 온실($20{\pm}5^{\circ}C$)에서 5주 동안 재배한 후에 발병 정도를 조사하는 것이 요구되었다. 위의 검정법을 이용하여 레이스가 다른 P. brassicae 4개 포장 균주에 대한, 시판 중인 양배추 16종과 브로콜리 17종 품종의 저항성 정도를 실험한 결과, 레이스 9인 GN1, GN2 그리고 GS 균주에 대해서는 중도저항성을 보이는 몇 가지 품종이 있었다. 그러나 레이스 2인 YC 균주에 대해서는 실험한 모든 품종이 고도의 감수성 반응을 나타내었다. 따라서 이 방법은 양배추와 브로콜리 뿌리혹병 저항성을 검정하기 위한 효율적인 검정법이라는 것을 알 수 있었다.

Keywords

References

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