Skip to page content
USDA Forest Service
  
Treesearch

Research & Development Treesearch

 
Treesearch Home
About Treesearch
Contact Us
Research & Development
Forest Products Lab
International Institute of Tropical Forestry
Northern
Pacific Northwest
Pacific Southwest
Rocky Mountain
Southern Research Station
Help
 

Science.gov - We Participate


USA.gov  Government Made Easy


Global Forest Information Service

US Forest Service
P.O. Box 96090
Washington, D.C.
20090-6090

(202) 205-8333

You are here: Home / Search / Publication Information
Bookmark and Share

Publication Information

View PDF (484 KB bytes)

Title: Wood decay by brown-rot fungi : changes in pore structure and cell wall volume

Author: Flournoy, Douglas S.; Kirk, T. Kent; Highley, T.L.;

Date: 1991

Source: Holzforschung. Vol. 45, no. 5 (Oct. 1991): pages 383-388.

Publication Series: Miscellaneous Publication

Description: Sweetgum (Liquidambar styraciflua L.) wood blocks were decayed by Postia (= Poria) placenta in soilblock cultures. Decay was terminated at various weight losses, and the pore volumes available to four low molecular weight molecules, (water, 4 Å,; glucose, 8 Å,; maltose, 10 Å; and raffinose, 128,) and three dextrans (Mr 6,000, 38 Å; 11,200, 51 Å; nd 17,500, 61 Å) were determined by the solute exclusion technique (Stone and Scallan 1968b). The volume in sound (undecayed) wood that was accessible to the seven probes varied from 1.0 ml g–1 for the three largest to 1.35 ml g–1 for water. Thus, the volume in sound wood attributable to lumens, pits, and other large openings was 1.0 ml g–1 and that accessible to water in the cell wall was 0.35 ml g–1. Of this volume, 80% was inaccessible to molecules > 12 Å in diameter. As the wood was decayed, the volume of pores in the cell wall increased steadily to 0.7 ml g–1 at 35% weight loss. New cell wall volume was accessible to the four low molecular weight probes but not to molecules of Mr ³ 6,000. The increase in accessible pore volume to the four smallest probes was gradual. Most of the new cell wall volume created by removal of components during decay was in the pore size range of 12 Å, to 38 Å. Within experimental error, no pores of > 38 Å, were observed in sound or decayed wood. Our results are consistent with the hypothesis that the initial depolymerization of cellulose, characteristic of brown rot, is caused by a diffusible agent. The molecular diameter of the agent is apparently in the range 12 Å, to 38 Å, and it causes erosion and thus enlargement of the pores to which it has access.

Keywords: Brown-rot fungi, pore size, cell wall volume, wood decay, cellulose, depolymerization, sweetgum, Liquidambar styraciflua, Postia placenta, wood destroying fungi, cell ultrastructure, pore volume, cell walls, wood anatomy

Publication Notes:

  • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
  • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

XML: View XML

Citation:


Flournoy, Douglas S.; Kirk, T. Kent; Highley, T.L. 1991. Wood decay by brown-rot fungi : changes in pore structure and cell wall volume. Holzforschung. Vol. 45, no. 5 (Oct. 1991): pages 383-388.

 


 [ Get Acrobat ]  Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility

USDA logo which links to the department's national site. Forest Service logo which links to the agency's national site.