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Mycology

Production and Degradation of Oxalic Acid by Brown Rot Fungi

Eduardo Espejo, Eduardo Agosin
Eduardo Espejo
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Eduardo Agosin
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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 14C-labeled oxalic acid to CO2 during cellulose depolymerization. The other brown rot fungi also oxidized 14C-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 14C-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.

FOOTNOTES

  • ↵* Corresponding author.

  • Copyright © 1991, American Society for Microbiology
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Production and Degradation of Oxalic Acid by Brown Rot Fungi
Eduardo Espejo, Eduardo Agosin
Applied and Environmental Microbiology Jul 1991, 57 (7) 1980-1986; DOI:

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Production and Degradation of Oxalic Acid by Brown Rot Fungi
Eduardo Espejo, Eduardo Agosin
Applied and Environmental Microbiology Jul 1991, 57 (7) 1980-1986; DOI:
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