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Titolo:
Transport of N-15 from a soil compartment separated by a polytetrafluoroethylene membrane to plant roots via the hyphae of arbuscular mycorrhizal fungi
Autore:
Mader, P; Vierheilig, H; Streitwolf-Engel, R; Boller, T; Frey, B; Christie, P; Wiemken, A;
Indirizzi:
Res Inst Organ Agr, CH-5070 Frick, Switzerland Res Inst Organ Agr Frick Switzerland CH-5070 CH-5070 Frick, Switzerland Univ Basel, Dept Bot, CH-4056 Basel, Switzerland Univ Basel Basel Switzerland CH-4056 ept Bot, CH-4056 Basel, Switzerland Swiss Fed Inst Forest Snow & Landscape Res, CH-8903 Birmensdorf, Switzerland Swiss Fed Inst Forest Snow & Landscape Res Birmensdorf Switzerland CH-8903 Queens Univ Belfast, Belfast BT9 5PX, Antrim, North Ireland Queens Univ Belfast Belfast Antrim North Ireland BT9 5PX m, North Ireland
Titolo Testata:
NEW PHYTOLOGIST
fascicolo: 1, volume: 146, anno: 2000,
pagine: 155 - 161
SICI:
0028-646X(200004)146:1<155:TONFAS>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
EXTERNAL HYPHAE; GLOMUS INTRARADICES; NITROGEN; NITRATE; INFECTION; NUTRIENT; MAIZE; DEPLETION; SYMBIOSIS; MYCELIUM;
Keywords:
extraradical hyphae; Glomus mosseae; hydrophobic membranes; nitrogen uptake; N-15 tracer;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
25
Recensione:
Indirizzi per estratti:
Indirizzo: Mader, P Res Inst Organ Agr, Ackerstr, CH-5070 Frick, Switzerland Res InstOrgan Agr Ackerstr Frick Switzerland CH-5070 witzerland
Citazione:
P. Mader et al., "Transport of N-15 from a soil compartment separated by a polytetrafluoroethylene membrane to plant roots via the hyphae of arbuscular mycorrhizal fungi", NEW PHYTOL, 146(1), 2000, pp. 155-161

Abstract

We studied the transport of N-15 from a soil compartment separated from a plant root compartment by a hydrophobic polytetrafluoroethylene (PTFE) membrane to plants in the presence and absence of arbuscular mycorrhizal fungi (AMF). We have previously shown that this type of membrane efficiently inhibits mass flow and diffusion of mobile ions in the soil solution in an abiotic system but can be penetrated by the hyphae of mycorrhizal fungi. Mycorrhizal tomatoes (Lycopersicon esculentum) colonized by Glomus mosseae were grown at two N fertilizer concentrations in a root compartment. A PTFE membrane was placed between the root compartment and an adjoining soil compartment that was inaccessible to the roots but accessible to the AMF hyphae (hyphal compartment). Additional N was applied to the hyphal compartment using uniformly N-15-labelled NH4NO3. There was a Aux of N-15 from the hyphal compartment to the plants el en in the absence of mycorrhizal fungi. However, this flux was much higher in mycorrhizal plants, which had much higher N concentrations in their shoots and roots than did the non-mycorrhizal controlplants. This was particularly apparent when the root compartment had a lowN fertilizer concentration. Of the total N content of mycorrhizal plants, c. 42 and 24%, at the low and high N fertilizer concentrations, respectively, were estimated to originate from the hyphal compartment by transport through AMF hyphae. In the presence of mycorrhizal fungi, the flux of N-15 wasabout three times higher than in their absence. The results show that AMF can access a soil compartment separated by a PTFE membrane, and can contribute substantially to N uptake by plants.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 14/07/20 alle ore 08:45:54