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- Title
Fungal decomposition of attached angiosperm twigs III. Effect of water potential and temperature on fungal growth, survival and decay of wood.
- Authors
Griffith, G. S.; Boddy, Lynne
- Abstract
Many fungi commonly isolated (> 5% isolation frequency) from dead attached ash (<em>Fraxinus excelsior</em> L.), beech (<em>Fagus sylvatica</em> L.) and oak (<em>Quercus robur</em> L.) twigs were capable of growth at water potentials below -6 MPa, including <em>Phomopsis</em> spp., <em>Cryptosporiopsis</em> spp., <em>Libertella fraxinea</em> Oganova, <em>Fusarium lateritium</em> Nees. and <em>Aureobasidium pullulans</em> (De Bary) Arnaud. Several of these underwent morphological switches at low water potentials. Growth of almost all basidiomycetes common in dead twigs, including <em>Peniophora</em> spp. and <em>Vuilleminia comedens</em> (Nees. : Fr.) Maire, was inhibited at water potentials below -4 MPa. The ecology of fungi commonly isolated from dead ash twigs was studied in greater detail. All except <em>Peniophora lycii</em> (Pers.) V. Hohn & Litch and <em>L. fraxinea</em>, survived in wood for 1 yr at extremely low water potentials (below -200 MPa). <em>P. lycii</em> was the only species that grew at low temperatures (<5 °C). Water potential was a major determinant of decay rate. Generally, even at high water potentials, decay by individual fungi over a 1 yr period was limited to 20-30% dry weight losses. However, at -0.05 and -0.8 MPa <em>P. lycii</em> caused 70% weight loss, and <em>L. fraxinea</em> caused 50% weight loss at -4.1MPa (its optimal water potential for decay). At water potentials between -4 and -9 MPa <em>L. fraxinea, Phomopsis platanoidis</em> Died. and unidentified sp. 12 were capable of producing significant lignocellulose decay.
- Subjects
FUNGAL ecology; MYCOLOGY; PHOMOPSIS; PENIOPHORA; TUBERCULARIACEAE; ENGLISH oak; EUROPEAN beech
- Publication
New Phytologist, 1991, Vol 117, Issue 2, p259
- ISSN
0028-646X
- Publication type
Article
- DOI
10.1111/j.1469-8137.1991.tb04907.x