Plant uptake of dual-labeled organic N biased by inorganic C uptake: Results of a triple labeling study

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  • Universität Bayreuth
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OriginalspracheEnglisch
Seiten (von - bis)524-527
Seitenumfang4
FachzeitschriftSoil Biology and Biochemistry
Jahrgang42
Ausgabenummer3
PublikationsstatusVeröffentlicht - März 2010

Abstract

Direct plant uptake of organic nitrogen (N) is often studied using the dual-labeling approach (15N + 13C or 15N + 14C). However, the method might be hampered by uptake of labeled inorganic carbon (C) produced by mineralization of labeled organic compounds. Here we report the results from a triple labeling experiment (15N + 13C + 14C) investigating whether root uptake of labeled inorganic C can bias the results obtained in studies of organic N uptake using dual-labeled amino acids (15N, 13C). In a rhizosphere tube experiment we investigated 13C and 14C uptake by maize either supplied with labeled glycine or CO32 -, but found no differences in uptake rates between these C-sources. The uptake of inorganic C to the shoot tissue was higher for maize grown in full light compared to shading, which indicates a passive uptake of inorganic C with water. We conclude that uptake of inorganic C produced by mineralization of amino acids can significantly bias the interpretations of organic N uptake studies using dual-labeling.

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Plant uptake of dual-labeled organic N biased by inorganic C uptake: Results of a triple labeling study. / Rasmussen, Jim; Sauheitl, Leopold; Eriksen, Jørgen et al.
in: Soil Biology and Biochemistry, Jahrgang 42, Nr. 3, 03.2010, S. 524-527.

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Rasmussen J, Sauheitl L, Eriksen J, Kuzyakov Y. Plant uptake of dual-labeled organic N biased by inorganic C uptake: Results of a triple labeling study. Soil Biology and Biochemistry. 2010 Mär;42(3):524-527. doi: 10.1016/j.soilbio.2009.11.032
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abstract = "Direct plant uptake of organic nitrogen (N) is often studied using the dual-labeling approach (15N + 13C or 15N + 14C). However, the method might be hampered by uptake of labeled inorganic carbon (C) produced by mineralization of labeled organic compounds. Here we report the results from a triple labeling experiment (15N + 13C + 14C) investigating whether root uptake of labeled inorganic C can bias the results obtained in studies of organic N uptake using dual-labeled amino acids (15N, 13C). In a rhizosphere tube experiment we investigated 13C and 14C uptake by maize either supplied with labeled glycine or CO32 -, but found no differences in uptake rates between these C-sources. The uptake of inorganic C to the shoot tissue was higher for maize grown in full light compared to shading, which indicates a passive uptake of inorganic C with water. We conclude that uptake of inorganic C produced by mineralization of amino acids can significantly bias the interpretations of organic N uptake studies using dual-labeling.",
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T2 - Results of a triple labeling study

AU - Rasmussen, Jim

AU - Sauheitl, Leopold

AU - Eriksen, Jørgen

AU - Kuzyakov, Yakov

N1 - Funding information: The present work was supported by the European Science Foundation (ESF) through the program “Nitrogen in Europe: Assessment of current problems and future solutions”.

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N2 - Direct plant uptake of organic nitrogen (N) is often studied using the dual-labeling approach (15N + 13C or 15N + 14C). However, the method might be hampered by uptake of labeled inorganic carbon (C) produced by mineralization of labeled organic compounds. Here we report the results from a triple labeling experiment (15N + 13C + 14C) investigating whether root uptake of labeled inorganic C can bias the results obtained in studies of organic N uptake using dual-labeled amino acids (15N, 13C). In a rhizosphere tube experiment we investigated 13C and 14C uptake by maize either supplied with labeled glycine or CO32 -, but found no differences in uptake rates between these C-sources. The uptake of inorganic C to the shoot tissue was higher for maize grown in full light compared to shading, which indicates a passive uptake of inorganic C with water. We conclude that uptake of inorganic C produced by mineralization of amino acids can significantly bias the interpretations of organic N uptake studies using dual-labeling.

AB - Direct plant uptake of organic nitrogen (N) is often studied using the dual-labeling approach (15N + 13C or 15N + 14C). However, the method might be hampered by uptake of labeled inorganic carbon (C) produced by mineralization of labeled organic compounds. Here we report the results from a triple labeling experiment (15N + 13C + 14C) investigating whether root uptake of labeled inorganic C can bias the results obtained in studies of organic N uptake using dual-labeled amino acids (15N, 13C). In a rhizosphere tube experiment we investigated 13C and 14C uptake by maize either supplied with labeled glycine or CO32 -, but found no differences in uptake rates between these C-sources. The uptake of inorganic C to the shoot tissue was higher for maize grown in full light compared to shading, which indicates a passive uptake of inorganic C with water. We conclude that uptake of inorganic C produced by mineralization of amino acids can significantly bias the interpretations of organic N uptake studies using dual-labeling.

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