The browser you are using is not supported by this website. All versions of Internet Explorer are no longer supported, either by us or Microsoft (read more here: https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Please use a modern browser to fully experience our website, such as the newest versions of Edge, Chrome, Firefox or Safari etc.

Maria Hansson. Photo.

Maria Hansson

Senior lecturer

Maria Hansson. Photo.

Effect of P availability on temporal dynamics of carbon allocation and Glomus intraradices high-affinity P transporter gene induction in arbuscular mycorrhiza

Author

  • Pål Axel Olsson
  • Maria Hansson
  • Stephen Burleigh

Summary, in English

Arbuscular mycorrhizal (AM) fungi depend on a C supply from the plant host and simultaneously provide phosphorus to the colonized plant. We therefore evaluated the influence of external P on C allocation in monoxenic Daucus carota-Glomus intraradices cultures in an AM symbiosis. Fungal hyphae proliferated from a solid minimal medium containing colonized roots into a C-free liquid minimal medium with high or low P availability. Roots and hyphae were harvested periodically, and the flow of C from roots to fungus was measured by isotope labeling. We also measured induction of a G. intraradices high-affinity P transporter to estimate fungal P demand. The prevailing hypothesis is that high P availability reduces mycorrhizal fungal growth, but we found that C How to the fungus was initially highest at the high P level. Only at later harvests, after 100 days of in vitro. culture, were C flow and fungal growth limited at high P availability. Thus, AM fungi can benefit initially from P-enriched environments in terms of plant C allocation. As expected, the P transporter induction was significantly greater at low P availability and greatest in very young mycelia. We found no direct link between C How to the fungus and the P transporter transcription level, which indicates that a good C supply is not essential for induction of the high-affinity P transporter. We describe a mechanism by which P regulates symbiotic C allocation, and we discuss how this mechanism may have evolved in a competitive environment.

Department/s

  • Biodiversity
  • Department of Biology
  • Microbial Ecology
  • Plant Biology

Publishing year

2006

Language

English

Pages

4115-4120

Publication/Series

Applied and Environmental Microbiology

Volume

72

Issue

6

Document type

Journal article

Publisher

American Society for Microbiology

Topic

  • Ecology

Status

Published

Research group

  • Microbial Ecology
  • Plant Biology

ISBN/ISSN/Other

  • ISSN: 0099-2240