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Utilization of organic nitrogen at two different substrate pH by different ectomycorrhizal fungi growing in symbiosis with Pinus sylvestris seedlings

Wallander, Håkan LU (2002) In Plant and Soil 243(1). p.23-30
Abstract
The aim of this study was to test the potential of four isolates of ectomycorrhizal (EM) fungi to utilize organic nitrogen (N) at two different substrate pHs. The organic N source ((1)5N labelled lyophilised fungal mycelium) was mixed with either untreated peat/sand mixture (pH 4.9) or peat/sand mixture limed to a pH of 5.9 and put in cylindrical containers added to each pot. The content of the containers was separated from the roots of Pinus sylvestris seedlings by a nylon mesh and a 2 mm air gap to reduce diffusion of labelled N to the roots. The mycorrhizal plants (except those colonized by Suillus variegatus 2) took up significantly more (1)5N from the labelled mycelium than uncolonized seedlings. Liming significantly reduced the... (More)
The aim of this study was to test the potential of four isolates of ectomycorrhizal (EM) fungi to utilize organic nitrogen (N) at two different substrate pHs. The organic N source ((1)5N labelled lyophilised fungal mycelium) was mixed with either untreated peat/sand mixture (pH 4.9) or peat/sand mixture limed to a pH of 5.9 and put in cylindrical containers added to each pot. The content of the containers was separated from the roots of Pinus sylvestris seedlings by a nylon mesh and a 2 mm air gap to reduce diffusion of labelled N to the roots. The mycorrhizal plants (except those colonized by Suillus variegatus 2) took up significantly more (1)5N from the labelled mycelium than uncolonized seedlings. Liming significantly reduced the uptake of (1)5N by one of the EM fungi (unidentified) but not the other tested species (Paxillus involutus and two isolates of S. variegatus). The EM fungal isolates differed in their influence on the bacterial activity of the soil. This was reduced with P. involutus at both pH levels and increased with one of the two S. variegatus isolates at the high pH and with the other S. variegatus isolate at the low pH level. Liming the soil generally increased bacterial activity. The influence of liming on the proportion of organic N uptake in relation to inorganic N uptake by ectomycorrhizal trees is discussed. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Plant and Soil
volume
243
issue
1
pages
23 - 30
publisher
Springer
external identifiers
  • wos:000177677300003
  • scopus:0036619530
ISSN
0032-079X
DOI
10.1023/A:1019901807061
language
English
LU publication?
yes
id
23e416c1-6024-4011-8e7d-585fa11925c7 (old id 146899)
date added to LUP
2007-06-29 14:59:24
date last changed
2017-01-01 04:31:02
@article{23e416c1-6024-4011-8e7d-585fa11925c7,
  abstract     = {The aim of this study was to test the potential of four isolates of ectomycorrhizal (EM) fungi to utilize organic nitrogen (N) at two different substrate pHs. The organic N source ((1)5N labelled lyophilised fungal mycelium) was mixed with either untreated peat/sand mixture (pH 4.9) or peat/sand mixture limed to a pH of 5.9 and put in cylindrical containers added to each pot. The content of the containers was separated from the roots of Pinus sylvestris seedlings by a nylon mesh and a 2 mm air gap to reduce diffusion of labelled N to the roots. The mycorrhizal plants (except those colonized by Suillus variegatus 2) took up significantly more (1)5N from the labelled mycelium than uncolonized seedlings. Liming significantly reduced the uptake of (1)5N by one of the EM fungi (unidentified) but not the other tested species (Paxillus involutus and two isolates of S. variegatus). The EM fungal isolates differed in their influence on the bacterial activity of the soil. This was reduced with P. involutus at both pH levels and increased with one of the two S. variegatus isolates at the high pH and with the other S. variegatus isolate at the low pH level. Liming the soil generally increased bacterial activity. The influence of liming on the proportion of organic N uptake in relation to inorganic N uptake by ectomycorrhizal trees is discussed.},
  author       = {Wallander, Håkan},
  issn         = {0032-079X},
  language     = {eng},
  number       = {1},
  pages        = {23--30},
  publisher    = {Springer},
  series       = {Plant and Soil},
  title        = {Utilization of organic nitrogen at two different substrate pH by different ectomycorrhizal fungi growing in symbiosis with Pinus sylvestris seedlings},
  url          = {http://dx.doi.org/10.1023/A:1019901807061},
  volume       = {243},
  year         = {2002},
}