병원성이 강한 Plasmodiophora brassicae PC91214 (race 4) 균주에 대한 배추와 무 품종의 저항성 평가
Resistance Evaluation of Cultivars of Chinese Cabbage and Radish against a High Virulence Plasmodiophora brassicae strain PC91214 (race 4)
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본 연구는 새로운 뿌리 혹병균 균주의 병원성 차이와 배추와 무의 저항성 차이를 구명하고자 수행하였다. Williams 판별 기주 4종을 이용한 접종 균주들의 race검정에서 기보유 균주는 발병률 64.1-90.6%이었고, PC91214 균주는 발병률 98.4-100%, 발병도 4.2-4.6를 보여 두 균주 모두 race 4이지만 PC91214 균주가 더 높은 병원성을 보이는 것으로 나타났다. 각 균주별 배추와 무의 시판 품종의 저항성을 조사하였다. 기보유 균주 접종 처리에서 발병률과 발병도를 조사하였는데, 역광 100.0%와 3.1, 매력 100%와 3.9, 노랑봄 100%와 4.8, 춘광 100%와 3.9, 정상 100%와 4.8을 보여 총 5품종에서 강하게 발병하였다. 반면 무는 청대봄무만 발병률 35.9%와 발병도1.0의 극약으로 발병하였고 공시한 무 품종 대부분이 기보유 균주에 대하여 저항성인 것으로 확인되었다. 하지만 PC91214 균주 접종 처리에서 모든 배추에서 발병률100.0%와 발병도 3.7–5.0을 보였고, 무의 발병률과 발병도는 강성무 60.9%와 1.5, 관동여름무 98.4%와 3.2, 백봉무 100%와 4.1, 청대봄무 100%와 4.7을 보여 PC91214 균주가 기보유 균주보다 더 강한 병원성과 시판 품종간 차이를 극명하게 나타내었다. 이상의 결과로부터 고랭지 주산지인 평창군에서 기존의 Plasmodiophora brassicae보다 더 강한 병원성을 가진 PC91214 균주가 확인되었다. 또한 배추는 CR 저항성 품종을 포함한 모든 품종이 이병되어 PC91214 균주에 대한 저항성 품종 육성이 시급한 것으로 나타났다. 무는 배추와 달리 PC91214 균주에 대하여 품종간 저항성 수준이 극명한 것으로 나타나 배추와 다른 유전자 및 유전 양식을 가지는 것으로 나타났다.
Abstract
The research was conducted in order to investigate the pathogenicity of Plasmodiophora brassicae strains isolated from main Chinese cabbage producing areas in Pyeongchang, Korea, and the resistant between cultivars of Chinese cabbage and radish. From the race examination using 4 Williams differential hosts, the disease incidence rates of retained strains (RSs) were 64.1～90.6%, while the newly isolated strains (NISs) showed the disease incidence rates at 98.4～100% and the disease severity at 4.2～4.6, meaning that NISs were race 4 have with higher pathogenicity than RSs. The disease incidence rates and the disease severity of RSs were Yeokkwang 100.0% and 3.1, Maeryeok 100% and 3.9, Norang Bom 100% and 4.8, Chungwang 100% and 3.9, Jeongsang 100% and 4.8, and Cheongdaebom 35.9% and 1.0. When it comes to NISs. However all Chinese cabbage cultivars showed that the disease incidence rate was 100% and the disease severity was 3.7–5.0. The disease incidence rates and disease severity on white radishes were 60.9% and 1.5 for Gangseongmu, 98.4% and 3.2 for Gwandongyeoreummu, 100% and 4.1 for Baekbongmu, and 100% and 4.7 for Cheongdaebommu. These results indciated that the virulence of NISs were higher than that of RSs.
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