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Micromorphological and Chemical Characteristics of Hardwoods Decayed by a Brown-rot Fungus  

Cha, Mi Young (Department of Forest Products and Technology, College of Agriculture, Chonnam National University)
Lee, Kwang Ho (Department of Forest Products and Technology, College of Agriculture, Chonnam National University)
Kim, Yoon Soo (Department of Forest Products and Technology, College of Agriculture, Chonnam National University)
Publication Information
Journal of the Korean Wood Science and Technology / v.35, no.6, 2007 , pp. 152-158 More about this Journal
Abstract
Micromorphological and chemical characteristics of living Castanea spp. and Tamarix spp. attacked by a brown-rot fungus were examined. Micromorphological features of brown-rotted hardwood species were similar to those observed in softwoods such as losses in birefringence under polarized microscopy, preferential degradation of $S_2$ layer and cracks in the $S_3$ layer. Thinning of the secondary cell wall in fibers was also observed, although it did not seem to be the main symptom. FT-IR analysis showed that bands assigned to cellulose and hemicelluloses decreased or disappeared, whereas the bands assigned to lignin increased. X-ray diffraction analysis exhibited the decrease of relative crystallinity, indicating that degradation of hardwood by a brown-rot fungus was in the advanced stages.
Keywords
brown-rot; hardwoods; castanea spp.; Tamaric spp.; micromorphology; chemical characteristics; FT-IR;
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