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Uptake of N-15-labelled alanine, ammonium and nitrate in Pinus sylvestris L. Ectomycorrhiza growing in forest soil treated with nitrogen, sulphur or lime

Wallander, Håkan LU ; Arnebrant, Kristina LU ; Östrand, Fredrik LU and Kårén, Ola (1997) In Plant and Soil 195(2). p.329-338
Abstract
The uptake of N-15-labelled alanine, ammonium and nitrate was studied in ectomycorrhizal morphotypes of intact Pinus sylvestris seedlings. PCR-RFLP analysis of the ITS-region of fungal rDNA was used to identify the morphotypes. Seedlings were grown in forest soil collected at an experimental site in southern Sweden. The treatments compared were a control, N fertilisation (600 kg N ha(-1) as urea), sulfur application (1200 kg S ha(-1)) and lime application (6000 kg CaCO3 ha(-1)). The forest, which had been dominated by Picea abies, was clear-cut two years before the forest soil was sampled. Soil was also collected from an adjacent standing forest. The aim of the present study was to detect changes in the ectomycorrhizal communities in... (More)
The uptake of N-15-labelled alanine, ammonium and nitrate was studied in ectomycorrhizal morphotypes of intact Pinus sylvestris seedlings. PCR-RFLP analysis of the ITS-region of fungal rDNA was used to identify the morphotypes. Seedlings were grown in forest soil collected at an experimental site in southern Sweden. The treatments compared were a control, N fertilisation (600 kg N ha(-1) as urea), sulfur application (1200 kg S ha(-1)) and lime application (6000 kg CaCO3 ha(-1)). The forest, which had been dominated by Picea abies, was clear-cut two years before the forest soil was sampled. Soil was also collected from an adjacent standing forest. The aim of the present study was to detect changes in the ectomycorrhizal communities in forest soils and relate these changes to the functional parameter of uptake of nitrogen from organic (alanine and protein) and inorganic (ammonium and nitrate) sources.



Liming resulted in the detection of a morphotype not found in other samples, and one morphotype was only found in samples from the standing forest (the fungi in these two morphotypes could not be identified). All mycorrhizal root tips showed a higher N-15 concentration after exposure to different nitrogen forms than non-mycorrhizal long roots. Uptake of N-15 from a labelled solution of alanine or ammonium was higher (about tenfold) than uptake from a N-15-labelled solution of nitrate. Uptake of ammonium and alanine varied between 0.2 and 0.5 mg N g(-1) h(-1) and between 0.1 and 0.33 mg N g(-1) h(-1), respectively, among the different morphotypes.



In seedlings grown in the control soil and in soil from standing forest, alanine and ammonium were taken up to a similar degree from a supply solution by all morphotypes, whereas ammonium uptake was higher than alanine uptake in seedlings grown in lime-treated soil (about twofold) and. to a lesser extent, in the nitrogen-and sulfur-treated soils. The higher ammonium uptake by morphotypes from the limed soil was confirmed in pure culture studies. In cases where ammonium was used as the N source, an isolate of the S. variegatus morphotype collected in the limed soil produced more biomass compared with isolates of S. variegatus collected in nitrogen or sulphur-treated soil. One isolate of a silvery white morphotype produced about equal amounts of biomass on alanine and ammonium, whereas all S. variegatus isolated performed better with ammonium as their N source. Based on the results it is hypothesised that liming can induce a shift in the ectomycorrhizal community, favouring individuals that mainly utilise inorganic nitrogen over those that primarily utilise organic nitrogen (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Plant and Soil
volume
195
issue
2
pages
329 - 338
publisher
Springer
external identifiers
  • scopus:0030783306
ISSN
0032-079X
DOI
10.1023/A:1004280401423
language
English
LU publication?
yes
id
48c10955-2a7a-4a2c-849e-4eed7563fbc7 (old id 8046643)
date added to LUP
2015-10-02 14:11:39
date last changed
2017-11-19 04:09:33
@article{48c10955-2a7a-4a2c-849e-4eed7563fbc7,
  abstract     = {The uptake of N-15-labelled alanine, ammonium and nitrate was studied in ectomycorrhizal morphotypes of intact Pinus sylvestris seedlings. PCR-RFLP analysis of the ITS-region of fungal rDNA was used to identify the morphotypes. Seedlings were grown in forest soil collected at an experimental site in southern Sweden. The treatments compared were a control, N fertilisation (600 kg N ha(-1) as urea), sulfur application (1200 kg S ha(-1)) and lime application (6000 kg CaCO3 ha(-1)). The forest, which had been dominated by Picea abies, was clear-cut two years before the forest soil was sampled. Soil was also collected from an adjacent standing forest. The aim of the present study was to detect changes in the ectomycorrhizal communities in forest soils and relate these changes to the functional parameter of uptake of nitrogen from organic (alanine and protein) and inorganic (ammonium and nitrate) sources. <br/><br>
<br/><br>
Liming resulted in the detection of a morphotype not found in other samples, and one morphotype was only found in samples from the standing forest (the fungi in these two morphotypes could not be identified). All mycorrhizal root tips showed a higher N-15 concentration after exposure to different nitrogen forms than non-mycorrhizal long roots. Uptake of N-15 from a labelled solution of alanine or ammonium was higher (about tenfold) than uptake from a N-15-labelled solution of nitrate. Uptake of ammonium and alanine varied between 0.2 and 0.5 mg N g(-1) h(-1) and between 0.1 and 0.33 mg N g(-1) h(-1), respectively, among the different morphotypes. <br/><br>
<br/><br>
In seedlings grown in the control soil and in soil from standing forest, alanine and ammonium were taken up to a similar degree from a supply solution by all morphotypes, whereas ammonium uptake was higher than alanine uptake in seedlings grown in lime-treated soil (about twofold) and. to a lesser extent, in the nitrogen-and sulfur-treated soils. The higher ammonium uptake by morphotypes from the limed soil was confirmed in pure culture studies. In cases where ammonium was used as the N source, an isolate of the S. variegatus morphotype collected in the limed soil produced more biomass compared with isolates of S. variegatus collected in nitrogen or sulphur-treated soil. One isolate of a silvery white morphotype produced about equal amounts of biomass on alanine and ammonium, whereas all S. variegatus isolated performed better with ammonium as their N source. Based on the results it is hypothesised that liming can induce a shift in the ectomycorrhizal community, favouring individuals that mainly utilise inorganic nitrogen over those that primarily utilise organic nitrogen},
  author       = {Wallander, Håkan and Arnebrant, Kristina and Östrand, Fredrik and Kårén, Ola},
  issn         = {0032-079X},
  language     = {eng},
  number       = {2},
  pages        = {329--338},
  publisher    = {Springer},
  series       = {Plant and Soil},
  title        = {Uptake of N-15-labelled alanine, ammonium and nitrate in Pinus sylvestris L. Ectomycorrhiza growing in forest soil treated with nitrogen, sulphur or lime},
  url          = {http://dx.doi.org/10.1023/A:1004280401423},
  volume       = {195},
  year         = {1997},
}