Journal of the Korean Wood Science and Technology

The Korean Society of Wood Science & Technology (한국목재공학회)
권호 표지

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

활엽수 갈색부후재의 미시형태 및 화학적 특성

  • 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)
  • 차미영 (전남대학교 농업생명과학대학 임산공학과) ;
  • 이광호 (전남대학교 농업생명과학대학 임산공학과) ;
  • 김윤수 (전남대학교 농업생명과학대학 임산공학과)
  • Received : 2007.07.26
  • Accepted : 2007.10.02
  • Published : 2007.11.25
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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.

갈생부후균의 침해를 받은 생입목(生立木) 상태의 밤나무 및 사시나무속 갈색부후재의 미시형태 및 화학적 특징을 분석하였다. 활엽수 갈색부후재는 침엽수 갈색부후재에서 나타나는 전형적인 특징 즉 복굴절의 감소, 2차벽 중증($S_2$)의 선택적 분해 및 세포벽의 갈라짐 현상을 보여주었다. 부분적으로 목섬유의 박벽화 현상도 관찰되었으나 주 분해형태는 아니었다. FT-IR 분석결과 셀룰로오스의 헤미셀룰로오스를 나타내는 band가 현저히 감소한 반면 리그닌을 가리키는 band는 증가되어 나타났다. X선 회절분석 결과 공시된 활엽수재의 상대 결정화도는 건전재에 비해 감소되어 나타난 것으로 보아, 갈색부후가 상당히 진전되었음을 보여주었다.

Keywords

References

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