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Seasonal changes in nitrogen availability, and root and microbial uptake of (15)N(13)C(9)-phenylalanine and (15)N-ammonium in situ at a temperate heath

Andresen, Louise C.; Michelsen, Anders; Jonasson, Sven and Ström, Lena LU (2011) In Agriculture, Ecosystems & Environment. Applied Soil Ecology 51. p.94-101
Abstract
In the plant biosynthesis of secondary compounds, phenylalanine is a precursor of condensed tannins. Tannins are deposited into the soil in plant root exudates and dead plant material and have been suggested to precipitate some soil nutrients and hence reduce nutrient availability for plants. Free amino acid, inorganic and microbial N concentration during the growing season was investigated in an ecosystem with a natural tannin chemosphere. The influence of tannins on the uptake of nitrogen in plants and microbes was followed by injecting tannic acid (TA), ammonium-(15)N and phenylalanine-(15)N/(13)C(9). Plants preferred ammonium over phenylalanine, while microbes had no preference. Soil microbes had a 77% uptake of intact phenylalanine.... (More)
In the plant biosynthesis of secondary compounds, phenylalanine is a precursor of condensed tannins. Tannins are deposited into the soil in plant root exudates and dead plant material and have been suggested to precipitate some soil nutrients and hence reduce nutrient availability for plants. Free amino acid, inorganic and microbial N concentration during the growing season was investigated in an ecosystem with a natural tannin chemosphere. The influence of tannins on the uptake of nitrogen in plants and microbes was followed by injecting tannic acid (TA), ammonium-(15)N and phenylalanine-(15)N/(13)C(9). Plants preferred ammonium over phenylalanine, while microbes had no preference. Soil microbes had a 77% uptake of intact phenylalanine. Phenylalanine was acquired intact by both grasses and Calluna, with 63% and 38% uptake of intact phenylalanine in grass fine roots and Calluna roots, respectively. Inorganic N and amino acid concentrations were lowest in the period with highest plant activity and grass root biomass but were unaffected by TA addition. (C) 2011 Elsevier B.V. All rights reserved. (Less)
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Contribution to journal
publication status
published
subject
keywords
Amino acid, (13)C, Calluna vulgaris, Deschampsia flexuosa, DON, Heathland, (15)N, Tannic acid
in
Agriculture, Ecosystems & Environment. Applied Soil Ecology
volume
51
pages
94 - 101
publisher
Elsevier
external identifiers
  • wos:000298909300012
  • scopus:80053545642
ISSN
0929-1393
DOI
10.1016/j.apsoil.2011.09.005
language
English
LU publication?
yes
id
f18a1a2b-ffdc-450e-bf36-8e8fdf5e03ad (old id 2313121)
date added to LUP
2012-02-07 10:00:01
date last changed
2017-01-01 03:13:41
@article{f18a1a2b-ffdc-450e-bf36-8e8fdf5e03ad,
  abstract     = {In the plant biosynthesis of secondary compounds, phenylalanine is a precursor of condensed tannins. Tannins are deposited into the soil in plant root exudates and dead plant material and have been suggested to precipitate some soil nutrients and hence reduce nutrient availability for plants. Free amino acid, inorganic and microbial N concentration during the growing season was investigated in an ecosystem with a natural tannin chemosphere. The influence of tannins on the uptake of nitrogen in plants and microbes was followed by injecting tannic acid (TA), ammonium-(15)N and phenylalanine-(15)N/(13)C(9). Plants preferred ammonium over phenylalanine, while microbes had no preference. Soil microbes had a 77% uptake of intact phenylalanine. Phenylalanine was acquired intact by both grasses and Calluna, with 63% and 38% uptake of intact phenylalanine in grass fine roots and Calluna roots, respectively. Inorganic N and amino acid concentrations were lowest in the period with highest plant activity and grass root biomass but were unaffected by TA addition. (C) 2011 Elsevier B.V. All rights reserved.},
  author       = {Andresen, Louise C. and Michelsen, Anders and Jonasson, Sven and Ström, Lena},
  issn         = {0929-1393},
  keyword      = {Amino acid,(13)C,Calluna vulgaris,Deschampsia flexuosa,DON,Heathland,(15)N,Tannic acid},
  language     = {eng},
  pages        = {94--101},
  publisher    = {Elsevier},
  series       = {Agriculture, Ecosystems & Environment. Applied Soil Ecology},
  title        = {Seasonal changes in nitrogen availability, and root and microbial uptake of (15)N(13)C(9)-phenylalanine and (15)N-ammonium in situ at a temperate heath},
  url          = {http://dx.doi.org/10.1016/j.apsoil.2011.09.005},
  volume       = {51},
  year         = {2011},
}