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Sauheitl, Leopold ; Glaser, Bruno ; Weigelt, Alexandra:
Uptake of intact amino acids by plants depends on soil amino acid concentrations.
In: Environmental and Experimental Botany.
Bd. 66
(2009)
Heft 2
.
- S. 145-152.
ISSN 0098-8472
DOI: https://doi.org/10.1016/j.envexpbot.2009.03.009
Abstract
Studies in different ecosystems have shown that plants take up intact amino acids directly but little isknown about the influence of free amino acid concentrations in the soil on this process.We investigatedthe effect of three different soil amino acid N concentrations (0.025, 0.13 and 2.5gNg−1 soil) on directuptake of four dual labelled (15N, 13C) amino acids (glycine, tyrosine, lysine, valine) in a greenhouseexperiment using Anthoxantum odoratum as a model plant.Our results revealed that 8–45% of applied 15N was incorporated into plant root and shoot tissue 48 hafter labelling. Additional 13C enrichment showed that 2–70% of this incorporated 15N was taken up asintact amino acid. Total 15N uptake and 15N uptake as intact amino acids were significantly affected bysoil amino acid N concentrations and significantly differed between the four amino acids tested.We found a positive effect of soil amino acid concentrations on uptake of mineralized 15N relative toamino acid concentrations for all amino acids which was presumably due to higher diffusion rates ofmineralized tracer to the root surface. However, intact amino acid uptake relative to amino acid concentrationsas well as the proportion of total 15N taken up directly decreased with increasing soil amino acidN concentrations for all amino acids, irrespective of their microbial degradability. This effect is most likelycontrolled by the mineral N concentration in soil and perhaps in plants which inhibits direct amino acidsuptake.Overall, we conclude that plant internal regulation of amino acid uptake controlled by mineral N isthe main mechanism determining direct uptake of amino acids and thus a lower contribution of intactamino acid uptake to the plants N nutrition has to be expected for higher amino acid concentrationsaccompanied by mineralization in soil.
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| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Zusätzliche Informationen: | BAYCEER82944 |
| Institutionen der Universität: | Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Lehrstuhl Biogeographie Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Lehrstuhl Bodenphysik Forschungseinrichtungen > Forschungszentren > Bayreuther Zentrum für Ökologie und Umweltforschung - BayCEER Fakultäten Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften Forschungseinrichtungen Forschungseinrichtungen > Forschungszentren |
| Titel an der UBT entstanden: | Ja |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik |
| Eingestellt am: | 05 Jun 2015 06:18 |
| Letzte Änderung: | 05 Jun 2015 06:18 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/14728 |