Mycobiology

  • 제48권6호
  • /
  • Pages.484-494
  • /
  • 2020
  • /
  • 1229-8093(pISSN)
  • /
  • 2092-9323(eISSN)
한국균학회 (The Korean Society of Mycology)
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Screening of Endophytic Fungal Isolates Against Raffaelea quercus-mongolicae Causing Oak Wilt Disease in Korea

  • Nguyen, Manh Ha (Tree Pathology and Mycology Laboratory, College of Forest and Environmental Sciences, Kangwon National University) ;
  • Yong, Joo Hyun (Tree Pathology and Mycology Laboratory, College of Forest and Environmental Sciences, Kangwon National University) ;
  • Sung, Han Jung (Tree Pathology and Mycology Laboratory, College of Forest and Environmental Sciences, Kangwon National University) ;
  • Lee, Jong Kyu (Tree Pathology and Mycology Laboratory, College of Forest and Environmental Sciences, Kangwon National University)
  • 투고 : 2020.05.11
  • 심사 : 2020.09.21
  • 발행 : 2020.12.31
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초록

Oak wilt disease caused by Raffaelea quercus-mongolicae has emerged obviously in Korea. We selected antifungal isolates against R. quercus-mongolicae among 368 endophytic fungal isolates from different parts of oak and pine trees. The experiment was conducted in the primary and secondary screenings by dual culture test. The antifungal activity of the selected isolates was assessed in culture filtrate test based on the inhibition rates in mycelial growth, sporulation, and spore germination of oak wilt fungus. Five isolates, E089, E199, E282, E409 and E415, showed strong antifungal activity in culture filtrate test, and their antifungal activity decreased on the culture media supplemented with heated culture filtrate. Higher mycelial growth inhibitions on the unheated media were recorded in E409 (Colletotrichum acutatum), E089 (Daldinia childiae), E415 (Alternaria alternata) and E199 (Daldinia childiae) with the inhibition rates of 79.0%, 70.1%, 68.9% and 64.5%, respectively. These isolates also had the higher sporulation inhibitions on unheated media with the rates of 96.8%, 84.2%, 82.8% and 80.5%, respectively. The spore germination of the oak wilt fungus was completely inhibited by E282 (Nectria balsamea) on both unheated and heated media. These results showed that a higher number of potent antifungal isolates against oak wilt fungus was isolated from the petiole compared to the other parts. This study could contribute to the development of biological control approaches for the management of oak wilt disease caused by R. quercus-mongolicae.

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과제정보

This research was supported by research grants from National Research Foundation of Korea [NRF-2017R1D1A3B03033191] and Kangwon National University [2017-N520170348].

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