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Titolo:
Rates and quantities of carbon flux to ectomycorrhizal mycelium following C-14 pulse labeling of Pinus sylvestris seedlings: effects of litter patches and interaction with a wood-decomposer fungus
Autore:
Leake, JR; Donnelly, DP; Saunders, EM; Boddy, L; Read, DJ;
Indirizzi:
Univ Sheffield, Dept Anim & Plant Sci, Sheffield S10 2TN, S Yorkshire, England Univ Sheffield Sheffield S Yorkshire England S10 2TN S Yorkshire, England Univ Wales, Cardiff Sch Biosci, Cardiff CF1 3TL, S Glam, Wales Univ WalesCardiff S Glam Wales CF1 3TL i, Cardiff CF1 3TL, S Glam, Wales
Titolo Testata:
TREE PHYSIOLOGY
fascicolo: 2-3, volume: 21, anno: 2001,
pagine: 71 - 82
SICI:
0829-318X(200102)21:2-3<71:RAQOCF>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
CORD-FORMING FUNGI; VEGETATIVE MYCELIUM; TRANSLOCATION; MYCORRHIZAE; ALLOCATION; ECOSYSTEMS; SYSTEMS; PLANTS; SOIL;
Keywords:
carbon allocation; difference imaging; digital autoradiography mycelial cords; mycelial interactions; mycorrhiza; saprotroph; time series analyses;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
22
Recensione:
Indirizzi per estratti:
Indirizzo: Leake, JR Univ Sheffield, Dept Anim & Plant Sci, Sheffield S10 2TN, S Yorkshire, England Univ Sheffield Sheffield S Yorkshire England S10 2TN e, England
Citazione:
J.R. Leake et al., "Rates and quantities of carbon flux to ectomycorrhizal mycelium following C-14 pulse labeling of Pinus sylvestris seedlings: effects of litter patches and interaction with a wood-decomposer fungus", TREE PHYSL, 21(2-3), 2001, pp. 71-82

Abstract

We used a novel digital autoradiographic technique that enabled, for the first time, simultaneous visualization and quantification of spatial and temporal changes in carbon allocation patterns in ectomycorrhizal mycelia. Mycorrhizal plants of Pinus sylvestris L. were grown in microcosms containing non-sterile peat. The time course and spatial distribution of carbon allocation by Fl sylvestris to mycelia of its mycorrhizal partners, Paxillus involutus (Batsch) Fr. and Suillus bovinus (L.): Kuntze, were quantified following C-14 pulse labeling of the plants. Litter patches were used to investigate the effects of nutrient resource quality on carbon allocation. The wood-decomposer fungus Phanerochaete velutina (D.C.: Pers. ) Parmasto was introduced to evaluate competitive and territorial interactions between its mycelial cords and the mycelial system of S. bovinus. Growth of ectomycorrhizal mycelium was stimulated in the litter patches. Nearly 60% of the C transferred from host plant to external mycorrhizal mycelium (> 2 mm from root surfaces) was allocated to mycelium in the patches, which comprised only 12% of the soil area available for mycelial colonization. Mycelia in the litter patch most recently colonized by mycorrhizal mycelium received the largest investment of carbon, amounting to 27 to 50% of the total C-14 in external mycorrhizal mycelium. The amount of C transfer to external mycelium of S. bovinus following pulse labeling was reduced from a maximum of 167 nmol in systems with no saprotroph to a maximum of 61 nmol in systems interacting with P. velutina. The C-14 content of S. bovinus mycelium reached a maximum 24-36 h after labelingin control microcosms, but allocation did not reach a peak until 56 h after labeling, when S, bovinus interacted with mycelium of fl velutina. The mycelium of S. bovinus contained 9% of the total C-14 in the plants (including mycorrhizae) at the end of the experiment, but this was reduced to 4% in the presence of P. velutina. The results demonstrate the dynamic manner in which mycorrhizal mycelia deploy C when foraging for nutrients. The inhibitory effect of the wood-decomposer fungus P. velutina on C allocation to external mycorrhizal mycelium has important implications for nutrient cycling in forest ecosystems.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/02/20 alle ore 08:06:24