Startseite Characterisation of Postia placenta colonisation during 36 weeks in acetylated southern yellow pine sapwood at three acetylation levels including genomic DNA and gene expression quantification of the fungus
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Characterisation of Postia placenta colonisation during 36 weeks in acetylated southern yellow pine sapwood at three acetylation levels including genomic DNA and gene expression quantification of the fungus

  • Gry Alfredsen EMAIL logo , Annica Pilgård und Carl Gunnar Fossdal
Veröffentlicht/Copyright: 9. Mai 2016
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Abstract

One way to protect timber in service against basidiomycete deterioration is by means of acetylation via reaction with acetic anhydride. The reason why acetylated wood (WAc) is resistant against decay fungi is still not exactly understood. The aim of this study was to contribute to this field of science, and Postia placenta colonisation after 4, 12, 20, 28 and 36 weeks was observed at three acetylation levels of Pinus spp. sapwood. Mass loss (ML) and wood moisture content (MC) data reflected the acetylation levels. The initial equilibrium MC (EMC) proved to be a good indicator of subsequent ML. Genomic DNA quantification showed P. placenta colonisation in all samples, also in samples where no ML were detectable. The number of expressed gene transcripts was limited, but the findings supported the results of previous studies: WAc seems to have some resistance against oxidative mechanisms, which are part of the metabolism of P. placenta. This leads to a delay in decay initiation, a delay in expression of genes involved in enzymatic depolymerisation, and a slower decay rate. The magnitudes of these effects are presented for each acetylation level. The data also imply that there is no absolute decay threshold at high acetylation levels, but instead a significant delay of decay initiation and a slower decay rate.

Acknowledgments:

We would like to thank Sigrun Kolstad (NIBIO) for her help with the decay test and with the molecular analysis. We are very grateful for the valuable and open discussions with Jimmy Dickerson and his group at Eastman Chemical Company. The authors gratefully acknowledge financial support from the EcoBuild Institute Centre of Excellence (337008-2), Norwegian Forest and Landscape Institute (335008) and The Research Council of Norway (243663/E50).

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Received: 2016-1-12
Accepted: 2016-4-4
Published Online: 2016-5-9
Published in Print: 2016-11-1

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