Pectin decomposition at the early stage of brown-rot decay by Fomitopsis palustris

Author:

Tanaka Yuki1ORCID,Nezu Ikumi23,Aiso Haruna2,Fujie Tomomi4,Konno Naotake4,Suzuki Tomohiro1ORCID,Ishiguri Futoshi2,Habu Naoto4

Affiliation:

1. Center for Bioscience Research and Education, Utsunomiya University , 350 Mine-machi, Utsunomiya, Tochigi , Japan

2. Department of Forest Science, School of Agriculture, Utsunomiya University , 350 Mine-machi, Utsunomiya, Tochigi , Japan

3. United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology , 3-5-8 Saiwai-cho Fuchu, Tokyo , Japan

4. Department of Applied Biological Chemistry, School of Agriculture, Utsunomiya University , 350 Mine-machi, Utsunomiya, Tochigi , Japan

Abstract

ABSTRACT The sapwood of Japanese cedar (Cryptomeria japonica D. Don) was decayed by the brown-rot fungus Fomitopsis palustris under bright and dark conditions. Scanning electron microscopy revealed the presence of mycelia inside the wood even after 1 week from the start of fungal exposure. Moreover, holes were observed in the torus after fungal exposure. Ruthenium red staining revealed that the pectin in pits was largely absent for 3 weeks. These events occurred before the mass loss of wood samples was confirmed at the early stage. Moreover, FpPG28A was more highly expressed at the hyphal front on a pectin-containing medium under dark conditions compared with bright conditions. This up-regulation under dark conditions indicated that the pectin decomposition ability was promoted inside the wood where light could not reach. In conclusion, we suggest that the brown-rot fungus completed its hyphal expansion within the wood via pectin decomposition in pits before holocellulose decomposition.

Funder

Japan Society for the Promotion of Science

Publisher

Oxford University Press (OUP)

Subject

Organic Chemistry,Molecular Biology,Applied Microbiology and Biotechnology,General Medicine,Biochemistry,Analytical Chemistry,Biotechnology

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