Research in Plant Disease (식물병연구)

The Korean Society of Plant Pathology (한국식물병리학회)
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Occurrence of Powdery Mildew Caused by New Race 2F of Podosphaera xanthii on Cucumber in Korea

Podosphaera xanthii의 새로운 Race 2F에 의한 오이 흰가루병 국내 발병 보고

  • Kim, Young-Ah (Department of Bioresources Engineering, Sejong University) ;
  • Jeong, A-Ram (Department of Molecular Biology, Sejong University) ;
  • Jang, Min (Department of Bioresources Engineering, Sejong University) ;
  • Park, Chang-Jin (Department of Bioresources Engineering, Sejong University)
  • 김영아 (세종대학교 바이오산업자원공학과) ;
  • 정아람 (세종대학교 분자생물학과) ;
  • 장민 (세종대학교 바이오산업자원공학과) ;
  • 박창진 (세종대학교 바이오산업자원공학과)
  • Received : 2020.07.31
  • Accepted : 2020.09.04
  • Published : 2020.09.30
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Abstract

Powdery mildew is a common and serious disease of the Cucurbitaceae including cucumber (Cucumis sativus) in most areas of the world. To identify causal agents of the powdery mildew and their physiological race(s), we collected cucumber leaves displaying typical symptoms of powdery mildew from different locations in Korea. Based on morphological and molecular characteristics, all powdery mildew isolates were identified as an obligate biotrophic fungal pathogen, Podosphaera xanthii. After inoculation at melon (Cucumis melo) differentials to identify the fungal race(s), P. xanthii isolate MI180427 and IC190611 were identified as race 1 which has been repeatedly reported as dominant race in Korea. However, another isolate SE180328 produced different disease response in the tested differentials, being identified as race 2 which has not been reported in Korea. To confirm the race of SE180328, we inoculated additional melon differentials and determined the isolate as race 2F that is the prevalent race of powdery mildew in Beijing, China. Report of this new race 2F in Korea will be helpful for future breeding programs to develop resistant varieties to this race.

흰가루병(powdery mildew)은 오이(Cucumis sativus)를 포함하는 박과(Cucurbitaceae) 작물에서 전 세계적으로 가장 심각한 피해를 일으키는 주요한 병 중 하나이다. 오이 흰가루병의 지속적인 발병과 방제의 어려움 때문에 그 원인 병원균을 밝히고 race를 규명하는 것이 필수적이다. 국내에서 발병하는 오이 흰가루병균의 조사를 위하여 경기도 광주(Gwangju), 경기도 이천(Icheon), 전라북도 김제(Gimje), 서울특별시(Seoul), 경상남도 밀양(Miryang) 지역에서 흰가루병이 발생한 오이 잎을 채집하였다. 형태학적, 분자생물학적 특성 조사 결과 분리된 오이 흰가루병균들은 절대 활물기생균인 Podosphaera xanthii로 동정되었다. P. xanthii의 race 규명에 사용되고 있는 멜론(C. melo) 판별 품종을 이용하여 밀양, 이천 서울에서 분리된 MI180427, IC190611, SE180328의 레이스를 각각 조사하였다. 분리균주 MI180427과 IC190611는 국내에서 가장 광범위하게 발병되고 있는 것으로 보고된 race 1으로 규명되었다. 반면, 분리균주 SE180328는 국내에서 아직까지 보고된 예가 없는 race 2로 판별되었다. SE180328의 정확한 race 판별을 위해서 추가적인 멜론 판별 품종에 접종한 결과, 흰가루병 race 2 중에서 중국 베이징의 주요 race로 알려진 race 2F로 동정되었다. 따라서 새로운 race 2F의 국내 발병을 보고하는 본 연구 결과는 향후 오이 흰가루병 저항성 품종 육성에 고려 되어야 할 기초자료가 될 것으로 생각된다.

Keywords

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