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Responses of ectomycorrhizal fungi to changes in carbon and nutrient availability

Fransson, Petra M.A. (2001). Responses of ectomycorrhizal fungi to changes in carbon and nutrient availability. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae. Silvestria, 1401-6230 ; 235
ISBN 91-576-6319-X
[Doctoral thesis]

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Ectomycorrhizal (ECM) fungi may receive 20% of the total C fixed by their host plants and are essential components of host nutrient acquisition. As a consequence of the vast physiological diversity that exists among ECM fungi, changes in community structure may potentially alter C and nutrient allocation and turnover within forest ecosystems. Effects of atmospheric CO2 enrichment and balanced nutrient addition on the community structure of ECM fungi were investigated. Significant effects of elevated CO2 , as well as elevated nutrient levels were found. Daily nutrient additions for 10 years did not cause reductions in the density of ECM roots or the degree of root colonisation, in contrast to other studies. Some species became more common due to nutrient additions; Cenococcum geophilum, Amphinema byssoides, Tylospora fibrillosa, tomentelloid species, and others, Piloderma byssinum and P. croceum, became less common. High variability among samples made individual species responses difficult to distinguish. Data suggest that the same species may respond similarly to both elevated CO2 and nutrient additions. In laboratory experiments, CO2 enrichment increased the production of extraradical mycelium by Hebeloma crustuliniforme, increasing mycelial spread and root colonisation. Under field conditions such a response could enable species to increase in abundance. The natural abundance of the stable isotope 13 C in fruitbodies can be used as a tool to distinguish between the two functional groups ECM and saprotrophic fungi. However, some caution is neccesary in the interpretation since values overlap between the two functional groups. The 13 C values can also be used to reveal the host-origin of carbon in mycorrhizal fungi in mixed forests. Generalist fungi, which can be associated with several different tree species, were found to receive most of their C from overstorey trees, as indicated by their high d 13 C values. This implies that large trees which are able to fix more C potentially subsidise smaller trees via a common ECM mycelial networ

Authors/Creators:Fransson, Petra M.A.
Title:Responses of ectomycorrhizal fungi to changes in carbon and nutrient availability
Series Name/Journal:Acta Universitatis Agriculturae Sueciae. Silvestria
Year of publishing :January 2001
Number of Pages:41
ALLI. Högberg, P., Plamboeck, A. H., Taylor, A. F. S. & Fransson P. M. A. (1999). Natural abundance of 13 C abundance reveals trophic status of fungi and host-origin of carbon in mycorrhizal fungi in mixed forests. Proceeding of National Academy of Science 96: 8534-8539. II. Fransson P. M. A., Taylor, A. F. S. & Finlay, R. D. (2001). Elevated atmospheric CO 2 alters root symbiont community structure in forest trees. New Phytologist 152: 431-442. III. Fransson P. M. A., Taylor, A. F. S. & Finlay, R. D. (2000). Effects of continuous optimal fertilisation upon a Norway spruce ectomycorrhizal community. Tree Physiology 20: 599-606. IV. Fransson P. M. A., Finlay, R. D. & Taylor, A. F. S. (0000). Mycelial production, spread and colonisation of Hebeloma crustuliniforme and Paxillus involutus under elevated CO 2 . New Phytologist. Submitte
Place of Publication:Uppsala
ISBN for printed version:91-576-6319-X
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:F Plant production > F61 Plant physiology - Nutrition
Subjects:Not in use, please see Agris categories
Agrovoc terms:picea abies, pinus sylvestris, paxillus, mycorrhizae, nutrient availability, carbon, carbon dioxide, nitrogen, boreal forests
Keywords:Basidiomycetes, boreal forest, morphotype, whole-tree chamber, fertilisation, 15 N, Picea abies, Pinus sylvestris, Paxillus involutus
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ID Code:43
Department:(S) > Institutionen för skoglig mykologi och patologi
Deposited By: Staff Epsilon
Deposited On:04 Jun 2002 00:00
Metadata Last Modified:02 Dec 2014 10:01

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