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Phosphorus and carbon availability regulate structural composition and complexity of AM fungal mycelium.

Olsson, Ola; Olsson, Pål Axel LU and Hammer, Edith LU (2014) In Mycorrhiza 24(6). p.443-451
Abstract
The regulation of the structural composition and complexity of the mycelium of arbuscular mycorrhizal (AM) fungi is not well understood due to their obligate biotrophic nature. The aim of this study was to investigate the structure of extraradical mycelium at high and low availability of carbon (C) to the roots and phosphorus (P) to the fungus. We used monoxenic cultures of the AM fungus Rhizophagus irregularis (formerly Glomus intraradices) with transformed carrot roots as the host in a cultivation system including a root-free compartment into which the extraradical mycelium could grow. We found that high C availability increased hyphal length and spore production and anastomosis formation within individual mycelia. High P availability... (More)
The regulation of the structural composition and complexity of the mycelium of arbuscular mycorrhizal (AM) fungi is not well understood due to their obligate biotrophic nature. The aim of this study was to investigate the structure of extraradical mycelium at high and low availability of carbon (C) to the roots and phosphorus (P) to the fungus. We used monoxenic cultures of the AM fungus Rhizophagus irregularis (formerly Glomus intraradices) with transformed carrot roots as the host in a cultivation system including a root-free compartment into which the extraradical mycelium could grow. We found that high C availability increased hyphal length and spore production and anastomosis formation within individual mycelia. High P availability increased the formation of branched absorbing structures and reduced spore production and the overall length of runner hyphae. The complexity of the mycelium, as indicated by its fractal dimensions, increased with both high C and P availability. The results indicate that low P availability induces a growth pattern that reflects foraging for both P and C. Low C availability to AM roots could still support the explorative development of the mycelium when P availability was low. These findings help us to better understand the development of AM fungi in ecosystems with high P input and/or when plants are subjected to shading, grazing or any management practice that reduces the photosynthetic ability of the plant. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Arbuscular mycorrhiza, Carbon, Mycelium, Phosphorus, Spores, Anastomosis
in
Mycorrhiza
volume
24
issue
6
pages
443 - 451
publisher
Springer
external identifiers
  • pmid:24435931
  • wos:000339428400004
  • scopus:84925348754
ISSN
1432-1890
DOI
10.1007/s00572-014-0557-8
project
BECC
MICCS - Molecular Interactions Controlling soil Carbon Sequestration
language
English
LU publication?
yes
id
ea13d5af-5700-4124-aac0-2a985e953842 (old id 4291221)
date added to LUP
2014-02-28 13:03:18
date last changed
2017-10-22 03:22:00
@article{ea13d5af-5700-4124-aac0-2a985e953842,
  abstract     = {The regulation of the structural composition and complexity of the mycelium of arbuscular mycorrhizal (AM) fungi is not well understood due to their obligate biotrophic nature. The aim of this study was to investigate the structure of extraradical mycelium at high and low availability of carbon (C) to the roots and phosphorus (P) to the fungus. We used monoxenic cultures of the AM fungus Rhizophagus irregularis (formerly Glomus intraradices) with transformed carrot roots as the host in a cultivation system including a root-free compartment into which the extraradical mycelium could grow. We found that high C availability increased hyphal length and spore production and anastomosis formation within individual mycelia. High P availability increased the formation of branched absorbing structures and reduced spore production and the overall length of runner hyphae. The complexity of the mycelium, as indicated by its fractal dimensions, increased with both high C and P availability. The results indicate that low P availability induces a growth pattern that reflects foraging for both P and C. Low C availability to AM roots could still support the explorative development of the mycelium when P availability was low. These findings help us to better understand the development of AM fungi in ecosystems with high P input and/or when plants are subjected to shading, grazing or any management practice that reduces the photosynthetic ability of the plant.},
  author       = {Olsson, Ola and Olsson, Pål Axel and Hammer, Edith},
  issn         = {1432-1890},
  keyword      = {Arbuscular mycorrhiza,Carbon,Mycelium,Phosphorus,Spores,Anastomosis},
  language     = {eng},
  number       = {6},
  pages        = {443--451},
  publisher    = {Springer},
  series       = {Mycorrhiza},
  title        = {Phosphorus and carbon availability regulate structural composition and complexity of AM fungal mycelium.},
  url          = {http://dx.doi.org/10.1007/s00572-014-0557-8},
  volume       = {24},
  year         = {2014},
}