Micromorphological characteristics and lignin distribution in bamboo (Phyllostachys pubescens) degraded by the white rot fungus Lentinus edodes
-
Abstract
Little is known about the decay pattern of bamboo by wood decay fungi, and the information available on fungal degradation of wood from other plant taxa cannot form the basis for understanding wood decay in bamboo because of differences in lignin composition and distribution. The present work was undertaken to elucidate the degradation pattern of bamboo by a lignin-degrading white rot fungus Lentinus edodes using various microscopic techniques, with a particular focus on the relation of bamboo lignin composition to the decay patterns produced by this fungus. Small blocks of bamboo, Phyllostachys pubescens, were examined after 16 weeks of incubation with the white rot fungus L. edodes. The compound middle lamellae (CML), including the cell corner regions, were preferentially degraded at an early stage of decay, whereas the fiber secondary walls remained largely intact at this point. Bamboo fiber walls were also eroded from the cell lumen side but the extent of degradation was limited. The FT-IR bands assigned to lignin exhibited a significant decrease. Cellular ultraviolet microspectrophotometric investigation showed that CML and vessel walls were composed of not only guaiacyl and syringyl unit (GS lignin) but also grass lignin. In contrast, the secondary wall of fibers consisted mainly of the GS lignin. Even though the CML and vessel walls exhibited higher lignin concentration, these cell walls were nevertheless degraded. The preferential degradation of the CML over the fiber secondary walls strongly suggested the involvement of not only enzyme systems of the white rot fungus but also a relationship to physicochemical properties of bamboo cell walls, particularly the influence of lignin composition and distribution.
©2008 by Walter de Gruyter Berlin New York
Articles in the same Issue
- Original Papers
- Alkaline-sulfite chemithermomechanical pulping of Eucalyptus grandis biotreated by Ceriporiopsis subvermispora under varied culture conditions
- First characterization of the development of bleached kraft softwood pulp fiber interfaces during drying and rewetting using FRET microscopy
- The fate of phosphorus in the bleaching of spruce TMP with the new bleaching agent – THPS
- Dynamics of the effective capillary cross-sectional area during the alkaline impregnation of eucalyptus wood
- Wood solubilization and depolymerization using supercritical methanol. Part 1: Process optimization and analysis of methanol insoluble components (bio-char)
- Wood solubilization and depolymerization by supercritical methanol. Part 2: Analysis of methanol soluble compounds
- Composition of callus resin of Norway spruce, Scots pine, European larch and Douglas fir
- The reduction in the fibre saturation point of wood due to chemical modification using anhydride reagents: A reappraisal
- Water absorption thermodynamics in single wood pellets modelled by multivariate near-infrared spectroscopy
- A survey of moisture distribution in two sets of Scots pine logs by NIR-spectroscopy
- Identification of selected log characteristics from computed tomography images of sugar maple logs using maximum likelihood classifier and textural analysis
- Compressive stress-strain properties of natural materials treated with aqueous NaOH
- Profile production in multi-veneer sheets by continuous roll forming
- Evaluation on structural performance of compressed wood as shear dowel
- Wood-adhesive interactions in a PVAc latex
- A comprehensive analysis of the relation of cellulose microfibril orientation and lignin content in the S2 layer of different tissue types of spruce wood (Picea abies (L.) Karst.)
- Micromorphological characteristics and lignin distribution in bamboo (Phyllostachys pubescens) degraded by the white rot fungus Lentinus edodes
- Synthesis of ethylene maleic anhydride copolymer containing fungicides and evaluation of their effect for wood decay resistance
- Short Notes
- Plasma treatment of heat treated beech wood – investigation on surface free energy
- Meetings
Articles in the same Issue
- Original Papers
- Alkaline-sulfite chemithermomechanical pulping of Eucalyptus grandis biotreated by Ceriporiopsis subvermispora under varied culture conditions
- First characterization of the development of bleached kraft softwood pulp fiber interfaces during drying and rewetting using FRET microscopy
- The fate of phosphorus in the bleaching of spruce TMP with the new bleaching agent – THPS
- Dynamics of the effective capillary cross-sectional area during the alkaline impregnation of eucalyptus wood
- Wood solubilization and depolymerization using supercritical methanol. Part 1: Process optimization and analysis of methanol insoluble components (bio-char)
- Wood solubilization and depolymerization by supercritical methanol. Part 2: Analysis of methanol soluble compounds
- Composition of callus resin of Norway spruce, Scots pine, European larch and Douglas fir
- The reduction in the fibre saturation point of wood due to chemical modification using anhydride reagents: A reappraisal
- Water absorption thermodynamics in single wood pellets modelled by multivariate near-infrared spectroscopy
- A survey of moisture distribution in two sets of Scots pine logs by NIR-spectroscopy
- Identification of selected log characteristics from computed tomography images of sugar maple logs using maximum likelihood classifier and textural analysis
- Compressive stress-strain properties of natural materials treated with aqueous NaOH
- Profile production in multi-veneer sheets by continuous roll forming
- Evaluation on structural performance of compressed wood as shear dowel
- Wood-adhesive interactions in a PVAc latex
- A comprehensive analysis of the relation of cellulose microfibril orientation and lignin content in the S2 layer of different tissue types of spruce wood (Picea abies (L.) Karst.)
- Micromorphological characteristics and lignin distribution in bamboo (Phyllostachys pubescens) degraded by the white rot fungus Lentinus edodes
- Synthesis of ethylene maleic anhydride copolymer containing fungicides and evaluation of their effect for wood decay resistance
- Short Notes
- Plasma treatment of heat treated beech wood – investigation on surface free energy
- Meetings
