Research in Plant Disease (식물병연구)

The Korean Society of Plant Pathology (한국식물병리학회)
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Inheritance of Resistance to Phytophthora capsici by Inoculums in Korean Hot Pepper

고추 역병균의 접종원에 따른 역병 저항성의 유전 양식

  • Soh, Jaewoo (Department of Horticultural Environment, National Institute of Horticultural and Herbal Science) ;
  • Han, Kyung-Sook (Department of Horticultural Environment, National Institute of Horticultural and Herbal Science) ;
  • Lee, Sung-Chan (Department of Horticultural Environment, National Institute of Horticultural and Herbal Science) ;
  • Lee, Jung-Sup (Department of Horticultural Environment, National Institute of Horticultural and Herbal Science)
  • 소재우 (국립원예특작과학원 원예특작환경과) ;
  • 한경숙 (국립원예특작과학원 원예특작환경과) ;
  • 이성찬 (국립원예특작과학원 원예특작환경과) ;
  • 이중섭 (국립원예특작과학원 원예특작환경과)
  • Received : 2012.07.25
  • Accepted : 2012.10.31
  • Published : 2012.12.31
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Abstract

The study aims to identify the pathogenicity of Phytophthora. capsici isolates in major pepper-producing areas in Korea and the inherit genetic pattern of phytophthora blight resistance by inocula. With five kinds of testing materials including 'Kataguma (Sakata Korea)' peppers, a disease-susceptible material, '#308', a phytophthora blight resistance material, 'CM334', and their $F_1$ and $F_2$, respective isolates of P. capsici obtained from Icheon, Eumseong, Buan, Imsil and Yeongyang regions together with six kinds of peppers' inoculum including PA-159 (KACC No.40482) received from Korean Agricultural Culture Collection were used for inoculation. The disease-susceptible material '#308', the resistant material 'CM334' and the non-segregating generation of $F_1$ represented 4.94-5.00, 1.00-1.07, and 1.01-1.08 phytophthora blight incidence respectively in the group comparison by isolate. This result means that the phytophthora blight resistance was clearly distinguished among testing materials in the group comparison by P. capsici isolate. Moreover, $F_2$ segregating generation showed 1.79-2.31 phytophthora blight incidence which turned out to be identical in the group comparison by the six isolates of P. capsici isolate and with similarity between both the resistant and susceptible materials. Thus, the result proved that using the six isolates of P. capsici tested as inocula was suitable to investigate the phytophthora blight resistance. When it comes to group comparison of $F_2$ segregation generation, however, isolates were divided with PA-159 isolate being the center: a group consisting of isolates from Icheon, Buan, and Imsil and a group consisting of Yeongyang and Eumseong isolates with higher pathogenicity. The expected segregation ratio of the phytophthora blight resistance in $F_2$ generation by isolate was analyzed. PA-159 isolate showed 3:1 or 9:3:3:1, indicating that one to two genes were involved. On the other hand, results also proved that there is an interaction of genes since both Eumseong and Yeongyang isolates showed a segregation ratio of 11:5 while the Icheon isolate represented 12:3:1.

본 연구는 국내 고추 주산지의 P. capsici의 균주에 대한 병원성과 균주별 역병 저항성 유전 양식을 구명하고자 수행하였다. 이병성 재료 '#308'과 역병 저항성 재료 'CM334' 및 이들의 $F_1$, $F_2$ 그리고 'Kataguma'(Sakata Korea) 고추 총 5종의 공시 재료에 이천, 음성, 부안, 임실, 영양 지역에서 수집한 P. capsici 각각의 균주와 국립농업유전자원센터에서 분양받은 PA-159(KACC No. 40482)를 포함하여 총 6종의 고추 P. capsici 균주를 사용하여 접종하였다. 접종 농도는 $1{\times}10^5spores/ml$로 관주 접종하였고 이들의 기내 특성, 이병률, $F_2$ 후대 집단의 역병저항성 분리 기대비를 분석하였다. 이병성 재료 '#308'과 저항성 'CM334', $F_1$의 비분리세대는 균주별 군내 비교에서는 각각 고추 역병의 발병도는 4.94-5.00, 1.00-1.07, 1.01-1.08을 보여 P. capsici 균주별 군내 비교에서 공시재료간 역병 저항성 차이는 명확히 구분할 수 있다. 또한 $F_2$ 분리세대의 역병 발병도의 경향은 1.79-2.31을 보여 P. capsici 군내 비교의 차이가 없고 저항성과 이병성 재료간에 유의한 차이를 보여 본 연구에서 사용된 6종의 P. capsici 균주 모두 역병 저항성 검정을 위한 균주로 활용 가능한 것으로 나타났다. 하지만 $F_2$ 분리세대의 균주별 군간 비교에서 PA-159 균주를 중심으로 이천 균주, 부안 균주, 임실 균주가 포함된 집단과 이보다 높은 병원성을 지닌 영양 균주와 음성 균주로 구분되었다. 각 균주별 $F_2$ 세대의 역병 저항성에 대한 분리 기대비를 분석하였는데, PA-159 균주는 3:1 또는 9:3:3:1의 분리비를 보여 1-2개의 유전자가 관여하는 것으로 나타났다. 반면 음성 균주와 영양 균주는 11:5, 이천 균주는 12:3:1의 분리비를 보여 유전자간 상호작용이 있는 것으로 나타났다.

Keywords

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