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Porträttbild på Edith Hammer. Foto.

Edith Hammer

Universitetslektor

Porträttbild på Edith Hammer. Foto.

Plants as resource islands and storage units - adopting the mycocentric view of arbuscular mycorrhizal networks

Författare

  • Ylva Lekberg
  • Edith Hammer
  • Pål Axel Olsson

Summary, in English

The majority of herbaceous plants are connected by arbuscular mycorrhizal (AM) fungi in complex networks, but how this affects carbon (C) and phosphorus (P) allocation among symbionts is poorly understood. We utilized a monoxenic AM system where hyphae from donor roots colonized two younger receiver roots of varying C status. AM fungal C allocation from donor to receiver compartments was followed by measuring the 13C contents in fungal- and plant-specific lipids, and P movement from a hyphal compartment was traced using 33P. Four times more 13C was translocated from donor to C-limited receiver roots, but C remained in fungal tissue. Root C status did not influence the overall AM colonization, but arbuscule density was twice as high in non-C-limited roots, and they received 10 times more 33P. The number of hyphal connections between compartments did not influence C and P allocation. Interestingly, there were more fungal storage lipids, but fewer structural lipids inside C-limited roots. Our results indicate that AM colonization may poorly reflect host quality as C can be supplied from neighboring roots. A mycocentric view of the symbiosis is proposed where C-delivering hosts are resource islands for the exchange of P for C, and C-limited hosts are storage units.

Avdelning/ar

  • Biodiversity
  • MEMEG
  • Mikrobiologisk ekologi
  • Växtbiologi

Publiceringsår

2010

Språk

Engelska

Sidor

336-345

Publikation/Tidskrift/Serie

FEMS Microbiology Ecology

Volym

74

Issue

2

Dokumenttyp

Artikel i tidskrift

Förlag

Oxford University Press

Ämne

  • Biological Sciences
  • Ecology

Nyckelord

  • carbon limitation
  • phosphorus
  • allocation
  • resource
  • arbuscular mycorrhiza
  • common mycorrhizal networks
  • fatty acid

Aktiv

Published

Forskningsgrupp

  • Microbial Ecology
  • Plant Biology

ISBN/ISSN/Övrigt

  • ISSN: 1574-6941