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

Lekberg, Ylva; Hammer, Edith LU and Olsson, Pål Axel LU (2010) In FEMS Microbiology Ecology 74(2). p.336-345
Abstract
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... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
carbon limitation, phosphorus, allocation, resource, arbuscular mycorrhiza, common mycorrhizal networks, fatty acid
in
FEMS Microbiology Ecology
volume
74
issue
2
pages
336 - 345
publisher
Elsevier
external identifiers
  • wos:000282883200007
  • scopus:78649367125
ISSN
1574-6941
DOI
10.1111/j.1574-6941.2010.00956.x
language
English
LU publication?
yes
id
2b6a7a18-9932-4dd4-bc80-369ebda6eccc (old id 1726105)
date added to LUP
2010-12-06 10:59:47
date last changed
2018-05-29 11:00:43
@article{2b6a7a18-9932-4dd4-bc80-369ebda6eccc,
  abstract     = {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.},
  author       = {Lekberg, Ylva and Hammer, Edith and Olsson, Pål Axel},
  issn         = {1574-6941},
  keyword      = {carbon limitation,phosphorus,allocation,resource,arbuscular mycorrhiza,common mycorrhizal networks,fatty acid},
  language     = {eng},
  number       = {2},
  pages        = {336--345},
  publisher    = {Elsevier},
  series       = {FEMS Microbiology Ecology},
  title        = {Plants as resource islands and storage units - adopting the mycocentric view of arbuscular mycorrhizal networks},
  url          = {http://dx.doi.org/10.1111/j.1574-6941.2010.00956.x},
  volume       = {74},
  year         = {2010},
}