Research in Plant Disease (식물병연구)

The Korean Society of Plant Pathology (한국식물병리학회)
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Genetic Diversity, Pathogenicity, and Fungicide Response of Fusarium oxysporum f. sp. fragariae Isolated from Strawberry Plants in Korea

국내 딸기 시들음병균 Fusarium oxysporum f. sp. fragariae의 유전적 다양성, 병원성과 살균제 반응

  • 남명현 (충남농업기술원 딸기연구소) ;
  • 김현숙 (충남농업기술원 딸기연구소) ;
  • 박명수 (서울대학교 자연과학대학 생명과학부) ;
  • 민지영 (충북대학교 농업생명환경대학 식물의학과) ;
  • 김흥태 (충북대학교 농업생명환경대학 식물의학과)
  • Received : 2020.05.26
  • Accepted : 2020.06.29
  • Published : 2020.06.30
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Abstract

Fusarium wilt caused by Fusarium oxysporum f. sp. fragariae (Fof) is the most important diseases of a strawberry field in Korea. We surveyed phylogenetic analysis, pathogenicity test, and fungicide response about Fof isolates isolated from Korea. Twenty-seven isolates of F. oxysporum isolated from strawberry plants were conducted in this study. Specific amplification by Fof specific primer was confirmed in all 26 isolates except Fo080701 isolate. The nuclear ribosomal intergenic spacer region and the translation elongation factor EF-lα gene sequences of isolates revealed three main lineages. Most of all isolates were contained DNA lineage group 1, but 2 and 3 group was shown only one and three isolates, respectively. All isolates were shown in pathogenicity with cv. Seolhyang. The EC50 mean values of prochloraz ranged 0.02-0.1 ㎍/ml except for Fo080701 and effectively inhibited mycelial growth at low concentrations. The EC50 value of metconazole was also 0.04-0.22 ㎍/ml, showing a similar inhibitory effect to that of prochloraz. The EC50 value of pyraclostrobin was 0.23-168.01 ㎍/ml, which was different according to the strain. In the field trial, boscalid+fludioxonil, fluxapyroxad+pyraclostrobin, and prochloraz manganese were selected as the effective fungicides for controlling Fusarium wilt.

Fusarium oxysporum f. sp. fragariae (Fof) 에 의한 딸기 시들음병은 국내 딸기재배에서 가장 중요한 병해 중 하나이다. 국내 발생하는 Fof의 특성을 분석하고자 시들음병균의 유전적 다양성, 병원성과 살균제 반응을 조사하였다. 분리균은 Fo080701를 제외한 모든 균주에서 Fof 특이적 primer에 증폭되었다. 분리균의 nuclear ribosomal intergenic spacer region과 EF-1α sequences 분석 결과 3개의 lineage를 형성하였다. 대부분의 분리균은 lineage 1에 속하였으며 lineage 3에 3개 균주와 lineage 2에 1개 균주가 포함되었다. 분리된 모든 균주는 설향품종에 병원성을 보였다. Prochloraz는 DNA lineage 2에 속하는 Fo080701균주를 제외하곤 시들음병균의 EC50값이 0.02-0.1 ㎍/ml로 낮은 농도에서 효과적으로 균사 생장을 억제하였다. Metconazole의 EC50값도 0.04-0.22 ㎍/ml로 prochloraz와 비슷한 억제 효과를 보였다. Pyraclostrobin의 EC50값은 0.23-168.01 ㎍/ml로 균주에 따라 차이가 컸다. 딸기 재배포장에서 boscalid+fludioxonil, fluxapyroxad+pyraclostrobin, prochloraz manganese이 딸기 시들음병 방제에 효과적이었다.

Keywords

References

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