Horticultural Science & Technology (원예과학기술지)

Korean Society of Horticultural Science (한국원예학회)
권호 표지

Resistance of Cultivars of Chinese Cabbage to Plasmodiophora brassicae Isolates of Several Races Collected in Korea

국내 재배포장에서 수집한 뿌리혹병균(Plasmodiophora brassicae) 균주들에 대한 배추 품종들의 저항성 반응

  • Jo, Su-Jung (Chemical Biotechnology Research Center, Korea Research Institute of Chemical Technology) ;
  • Shim, Sun-Ah (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) ;
  • Kim, Jin-Cheol (Chemical Biotechnology Research Center, Korea Research Institute of Chemical Technology) ;
  • Choi, Gyung-Ja (Chemical Biotechnology Research Center, Korea Research Institute of Chemical Technology)
  • 조수정 (한국화학연구원 산업바이오화학연구센터) ;
  • 심선아 (한국화학연구원 산업바이오화학연구센터) ;
  • 장경수 (한국화학연구원 산업바이오화학연구센터) ;
  • 최용호 (한국화학연구원 산업바이오화학연구센터) ;
  • 김진철 (한국화학연구원 산업바이오화학연구센터) ;
  • 최경자 (한국화학연구원 산업바이오화학연구센터)
  • Received : 2011.08.11
  • Accepted : 2011.09.11
  • Published : 2011.12.31
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Abstract

Clubroot disease caused by Plasmodiophora brassicae, induces damage to cruciferous vegetables worldwide. For control of the disease, many CR (clubroot resistant) $F_1$ hybrid cultivars of Chinese cabbage have been bred and released in Korea. In this study, we determined the race of 10 field isolates of P. brassicae collected from ten regions in Korea using Williams' differential varieties and investigated the degree of resistance of 25 commercial CR cultivars of Chinese cabbage to the isolates. The clubroot pathogens were assigned into two (HS and YC), two (HN1 and HN2), two (DJ and SS) and four (GS, GN, JS, and PC) isolates for race 2, race 4, race 5, race 9, respectively. All CR cultivars showed similar response, resistant or susceptible, to each isolate and the P. brassicae isolates were divided into two groups. Among them, the DJ, GS, GN, HS, and JS isolates could not infect the CR cultivars. In contrast, the SS, HN1, HN2, PC, and YC isolates caused severe clubroot disease on the CR cultivars like susceptible cultivars. Even though they belong to the same race, the CR cultivars showed a different response to the pathogens. The results suggest that the breakdown of CR in Chinese cabbage has already occurred in cultivation areas of Korea and resistance source introduced in CR cultivars may be very limited. In addition, it is likely that resistance genes of Williams' differential varieties to P. brassicae are different from the gene of CR cultivars of Chinese cabbage used in the study.

Plasmodiphora brassicae에 의해 발생하는 뿌리혹병은 전세계 십자화과 작물에 많은 피해를 주고 있다. 본 연구에서는 우리나라 여러 지역으로부터 10개의 뿌리혹병균을 채집하여 Williams 판별품종을 이용하여 레이스를 검정하고, 이들 균주에 대한 뿌리혹병 저항성(CR) 배추 품종 25개의 저항성 정도를 조사하였다. 실험한 뿌리혹병균 중 HS와 YC 균주는 레이스 2, HN1과 HN2는 레이스 4, DJ와 SS 균주는 레이스 5 그리고 GS, GN, JS 및 PC 균주는 레이스 9로 동정되었다. 시판 중인 25개 CR 배추 품종의 이들 균주에 대한 저항성을 조사한 결과, 각 균주에 대하여 25개 CR 품종은 거의 동일하게 반응하였으며, 뿌리혹병균의 레이스와 관계없이 두 종류의 반응을 나타냈다. DJ, GS, GN, HS 및 JS 등의 5개 균주에는 저항성 반응을 나타내었으며, SS, HN1, HM2, PC 및 YC 균주에 의해서는 감수성 품종과 동일한 정도의 뿌리혹병 발생을 보였다. 이상의 결과로부터 우리나라 포장에는 CR 배추를 감염하는 뿌리혹병균이 이미 존재하고 있으며, 실험한 CR 품종들의 저항성 유전자원은 매우 단순하다고 생각되었다. 또 동일한 레이스의 뿌리혹병균도 CR 품종에 다른 반응을 나타내므로 CR 배추 품종의 저항성 유전자는 Williams 판별 기주의 저항성 유전자와 다르다고 추정된다.

Keywords

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