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Comparative studies of delignification caused by ganoderma species
J E Adaskaveg1, R L Gilbertson, R A Blanchette
1Department of Plant Pathology, University of Arizona, Tucson, Arizona 85721, and Department of Plant Pathology, University of Minnesota, St. Paul, Minnesota 55108.
Applied and Environmental Microbiology
|June 1, 1990
Summary
Six Ganoderma species were tested for wood decay capabilities. Two undescribed species showed high white fir decay, while Ganoderma colossum excelled in oak delignification, indicating potential for lignin degradation applications.
Area of Science:
- Mycology
- Wood Science
- Biotechnology
Background:
- Ganoderma species are known wood-decay fungi.
- Understanding their ligninolytic capabilities is crucial for biotechnological applications.
- The G. lucidum complex includes species with varying decay potentials.
Purpose of the Study:
- To evaluate the wood decay abilities of six Ganoderma species on oak and white fir.
- To determine the extent of delignification and simultaneous decay caused by each species.
- To identify Ganoderma species with potential for lignin degradation applications.
Main Methods:
- In vitro agar block decay tests were performed on Quercus hypoleucoides (oak) and Abies concolor (white fir).
- Morphological, ultrastructural, and chemical analyses of decayed wood assessed delignification.
- Lignin-to-glucose gram loss ratios were calculated to quantify decay.
Main Results:
- All tested Ganoderma species decayed both oak and white fir, with greater weight loss in oak.
- Undescribed Ganoderma species (RLG16161, RLG16162, JEA615, JEA625) caused significantly higher white fir decay (21-26%) compared to other species (10-16%).
- Ganoderma colossum exhibited extensive delignification in oak (lignin-to-glucose ratio up to 4.9:1), suggesting suitability for lignin degradation studies.
Conclusions:
- Ganoderma species exhibit differential wood decay and delignification capabilities.
- Undescribed Ganoderma species show promise for white fir decay.
- Ganoderma colossum is a strong candidate for biotechnological lignin degradation applications due to its extensive delignification capacity.