Influence of Wood Extractives on Cell Wall Degradation at Heartwood and Sapwood of Cryptomeria japonica by Different Species of Wood Rotting Fungi
Akane HOSAKA, Tomy Listanto, Ph.D,; Prof Makoto Yoshida
2022 | Tesis | MAGISTER ILMU KEHUTANAN-
The balance of photosynthesis by plants and degradation by decomposers is important to maintain the healthy cycle of the carbon on the Earth. Wood rotting fungi are greatly involved in the Earths carbon cycle by degrading carbon-rich wood biomass. However, little is known about how different types of fungi degrade a variety of wood species that contain various types and amounts of wood extractives. It is important to investigate the biological degradation of wood caused by wood rotting fungi with special attention to wood extractives along with sufficient consideration of the diverse behaviors of wood rotting fungi. By understanding the whole picture of wood degradation by wood rotting fungi, human society will have better ideas about how to use wood biomass more efficiently and safely without causing adverse effect on the climate. This study investigated the cell wall degradation at sapwood and heartwood of Japanese cedar (Cryptomeria japonica) lumber by different species of wood rotting fungi. More specifically, this study investigated the factors which affect diversity of degradation manners, degradation patterns of sapwood and heartwood of Cryptomeria japonica, as well as the effect of wood extractive removal on 10 species of fungi in Cryptomeria japonica wood degradation. Cryptomeria japonica is gymnosperm and is a commonly used species in Japan as construction materials. 4 types of wood block samples were prepared out of a lumber of this species: Untreated sapwood, extracted sapwood, untreated heartwood, and extracted heartwood. The tested fungi include 5 brown rot fungi Gloeophyllum trabeum, Fomitopsis pinicola, Fomitopsis palustris, Coniophora puteana, and Serpula lacrymans and 5 white rot fungi Pleurotus ostreatus, Ganoderma applanatum, Ganoderma lucidum, Ganoderma mastoporum, and Trametes versicolor. In each container, a fungal species was inoculated and a combination of 2 wood blocks was placed. After approximately 3 months of incubation, the wood block samples were recovered to check the mass loss and the changes in chemical components using FTIR. As a result, it was found that extractives greatly affect diversity of degradation manners. For many fungal species, presence of extractives has negative effects on their
Kata Kunci : Fungi, Ganoderma
