Journal of Forest and Environmental Science

Institute of Forest Science, kangwon National University (강원대학교 산림과학연구소)
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Identification, Enzymatic Activity, and Decay Ability of Basidiomycetous Fungi Isolated from the Decayed Bark of Mongolian Oak (Quercus mongolica Fisch. ex Ledeb.)

  • Nguyen, Manh Ha (Tree Pathology and Mycology Laboratory, College of Forest and Environmental Sciences, Kangwon National University) ;
  • Kim, Dae Ho (Tree Pathology and Mycology Laboratory, College of Forest and Environmental Sciences, Kangwon National University) ;
  • Park, Ji Hyun (Department of Forest Insects and Diseases, National Institute of Forest Science) ;
  • Park, Young Ui (Green Space Corporation) ;
  • Lee, Moo Yeul (Green Space Corporation) ;
  • Choi, Myeong Hee (Green Space Corporation) ;
  • Lee, Dong Ho (Green Space Corporation) ;
  • Lee, Jong Kyu (Tree Pathology and Mycology Laboratory, College of Forest and Environmental Sciences, Kangwon National University)
  • Received : 2021.01.17
  • Accepted : 2021.01.28
  • Published : 2021.03.31
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Abstract

Decay fungi can decompose plant debris to recycle carbon in the ecosystem. Still, they can also be fungal pathogens, which can damage living trees and/or wood material and cause a large amount of timber loss. We isolated and identified basidiomycetous fungi from the decayed bark of Mongolian oak wrapped with sticky roll traps. The degrading enzyme activities were then tested for all fungal isolates. The decay ability of selected isolates was assessed based on the weight loss of wood discs after inoculating with culture suspension of decay fungi under the different humidity levels. A total of 46 basidiomycetous fungal isolates belonged to 12 species, and 10 genera were obtained from Jong Myo (16 isolates), Chang Kyung palace (7 isolates), Cheong Gye (10 isolates), and Gun Po (13 isolates). Gymnopus luxurians was the most dominant fungus in the present study, and this species distributed in all survey sites with 9 isolates in Jong Myo, followed by 3 isolates in Chang Kyung palace, while Cheong Gye and Gun Po had only 1 isolate each. Among 46 isolates, 44 isolates secreted at least one enzyme, while 25 isolates produced both cellulase and phenol oxidase enzymes, and 2 isolates produced neither. The assessment of decay ability by artificial inoculation indicated that the weight loss of wood discs was significantly influenced by humidity conditions when inoculated with bark decay fungi. The percent weight losses by G. luxurians inoculation in RH of 90-100% and RH of 65-75% were 4.61% and 2.45%, respectively. The weight loss caused by Abortiporus biennis were 6.67% and 0.46% in RH of 90-100% and RH of 45-55%, respectively. The humidity reduction approach should be applied for further studies to control the growth and spread of bark decay fungi on the trunks wrapped with sticky roll traps.

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