Mechanism of antibacterial activity of the white-rot fungus Hypholoma fasciculare colonizing wood.

Abstract:

:In a previous study it was shown that the number of wood-inhabiting bacteria was drastically reduced after colonization of beech (Fagus sylvatica) wood blocks by the white-rot fungus Hypholoma fasciculare, or sulfur tuft (Folman et al. 2008). Here we report on the mechanisms of this fungal-induced antibacterial activity. Hypholoma fasciculare was allowed to invade beech and pine (Pinus sylvestris) wood blocks that had been precolonized by microorganisms from forest soil. The changes in the number of bacteria, fungal biomass, and fungal-related wood properties were followed for 23 weeks. Colonization by the fungus resulted in a rapid and large reduction in the number of bacteria (colony-forming units), which was already apparent after 4 weeks of incubation. The reduction in the number of bacteria coincided with fungal-induced acidification in both beech and pine wood blocks. No evidence was found for the involvement of toxic secondary metabolites or reactive oxygen species in the reduction of the number of bacteria. Additional experiments showed that the dominant bacteria present in the wood blocks were not able to grow under the acidic conditions (pH 3.5) created by the fungus. Hence our research pointed at rapid acidification as the major factor causing reduction of wood-inhabiting bacteria upon colonization of wood by H. fasciculare.

journal_name

Can J Microbiol

authors

de Boer W,Folman LB,Gunnewiek PJ,Svensson T,Bastviken D,Oberg G,del Rio JC,Boddy L

doi

10.1139/w10-023

subject

Has Abstract

pub_date

2010-05-01 00:00:00

pages

380-8

issue

5

eissn

0008-4166

issn

1480-3275

pii

w10-023

journal_volume

56

pub_type

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