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Uptake of intact amino acids by plants depends on soil amino acid concentrations

Title data

Sauheitl, Leopold ; Glaser, Bruno ; Weigelt, Alexandra:
Uptake of intact amino acids by plants depends on soil amino acid concentrations.
In: Environmental and Experimental Botany. Vol. 66 (2009) Issue 2 . - pp. 145-152.
ISSN 0098-8472
DOI: https://doi.org/10.1016/j.envexpbot.2009.03.009

Abstract in another language

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.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER82944
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Biogeography
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Soil Physics
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 05 Jun 2015 06:18
Last Modified: 05 Jun 2015 06:18
URI: https://eref.uni-bayreuth.de/id/eprint/14728