Affiliation:
1. Department of Chemical Engineering, Faculty of Engineering, Catholic University of Chile, P.O. Box 6177, Santíago, Chile
Abstract
Our results show that all of the brown rot fungi tested produce oxalic acid in liquid as well as in semisolid cultures.
Gloeophyllum trabeum
, which accumulates the lowest amount of oxalic acid during decay of pine holocellulose, showed the highest polysaccharide-depolymerizing activity. Semisolid cultures inoculated with this fungus rapidly converted
14
C-labeled oxalic acid to CO
2
during cellulose depolymerization. The other brown rot fungi also oxidized
14
C-labeled oxalic acid, although less rapidly. In contrast, semisolid cultures inoculated with the white rot fungus
Coriolus versicolor
did not significantly catabolize the acid and did not depolymerize the holocellulose during decay. Semisolid cultures of
G. trabeum
amended with desferrioxamine, a specific iron-chelating agent, were unable to lower the degree of polymerization of cellulose or to oxidize
14
C-labeled oxalic acid to the extent or at the rate that control cultures did. These results suggest that both iron and oxalic acid are involved in cellulose depolymerization by brown rot fungi.
Publisher
American Society for Microbiology
Subject
Ecology,Applied Microbiology and Biotechnology,Food Science,Biotechnology
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