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A mycorrhizal fungus grows on biochar and captures phosphorus from its surfaces

  • Edith Hammer
  • Zsuzsanna Balogh-Brunstad
  • Iver Jakobsen
  • Pål Axel Olsson
  • Susan L. S. Stipp
  • Matthias C. Rillig
Publishing year: 2014
Language: English
Pages: 252-260
Publication/Series: Soil Biology & Biochemistry
Volume: 77
Document type: Journal article
Publisher: Elsevier

Abstract english

Biochar application to soils has potential to simultaneously improve soil fertility and store carbon to aid climate change mitigation. While many studies have shown positive effects on plant yields, much less is known about the synergies between biochar and plant growth promoting microbes, such as mycorrhizal fungi. We present the first evidence that arbuscular mycorrhizal (AM) fungi can use biochar as a physical growth matrix and nutrient source. We used monoxenic cultures of the AM fungus Rhizophagus irregularis in symbiosis with carrot roots. Using scanning electron microscopy we observed that AM fungal hyphae grow on and into two contrasting types of biochar particles, strongly attaching to inner and outer surfaces. Loading a nutrient-poor biochar surface with nutrients stimulated hyphal colonization. We labeled biochar surfaces with P-33 radiotracer and found that hyphal contact to the biochar surfaces permitted uptake of P-33 and its subsequent translocation to the associated host roots. Direct access of fungal hyphae to biochar surfaces resulted in six times more P-33 translocation to the host roots than in systems where a mesh prevented hyphal contact with the biochar. We conclude that AM fungal hyphae access microsites within biochar, that are too small for most plant roots to enter (<10 mu m), and can hence mediate plant phosphorus uptake from the biochar. Thus, combined management of biochar and AM fungi could contribute to sustainable soil and climate management by providing both a carbon-stable nutrient reservoir and a symbiont that facilitates nutrient uptake from it. (C) 2014 Elsevier Ltd. All rights reserved.


  • Ecology
  • Biological Sciences
  • Adsorption
  • Charcoal
  • Fertilizer
  • Glomus intraradices
  • Phosphate
  • Slow
  • release


  • BECC
  • ISSN: 0038-0717
Pål Axel Olsson
E-mail: pal_axel [dot] olsson [at] biol [dot] lu [dot] se



+46 46 222 42 47



Research group

Plant Biology



Doctoral students and postdocs

PhD students, main supervisor

Theodor Kindeberg

PhD students, assistant supervisor