High potential, but low actual, glycine uptake of dominant plant species in three Australian land-use types with intermediate N availability
The traditional view of the nitrogen (N) cycle has been challenged since the discovery that plants can compete with microbes for low molecular weight (LMW) organic N. Despite a number of studies that have shown LMW organic N uptake by plants, there remains a debate on the overall ecological relevanc...
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Language: | English |
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ftcdlib:qt8nv8k7br 2023-05-15T15:14:41+02:00 High potential, but low actual, glycine uptake of dominant plant species in three Australian land-use types with intermediate N availability Kahmen, Ansgar Livesley, Stephen J. Arndt, Stefan K. pp 109-121 2009-12-01 application/pdf http://www.escholarship.org/uc/item/8nv8k7br english eng eScholarship, University of California http://www.escholarship.org/uc/item/8nv8k7br qt8nv8k7br public Kahmen, Ansgar; Livesley, Stephen J.; & Arndt, Stefan K.(2009). High potential, but low actual, glycine uptake of dominant plant species in three Australian land-use types with intermediate N availability. Plant and Soil: An International Journal on Plant-Soil Relationships, 325(1), pp 109-121. doi:10.1007/s11104-009-9960-x. Retrieved from: http://www.escholarship.org/uc/item/8nv8k7br Life Sciences Ecology Plant Physiology Soil Science & Conservation Plant Sciences Amino acids Glycine Microbial competition Mineral nutrition Stable isotopes article 2009 ftcdlib https://doi.org/10.1007/s11104-009-9960-x 2016-04-02T18:46:10Z The traditional view of the nitrogen (N) cycle has been challenged since the discovery that plants can compete with microbes for low molecular weight (LMW) organic N. Despite a number of studies that have shown LMW organic N uptake by plants, there remains a debate on the overall ecological relevance of LMW organic N uptake by plants across ecosystems with different N availabilities. We here report patterns of glycine N uptake by plants from three different Australian land-use types with intermediate N availability and low inherent glycine concentrations in the soil. Using 15N labeled tracers, we tested the potential of these plants to acquire glycine in ex-situ laboratory experiments and attempted to validate these results in the field by determining actual uptake of glycine by plants directly from the soil. We found in the ex-situ experiments that plants from all three land-use types were able to take up significant amounts of glycine. In contrast, glycine uptake directly from the soil was minimal in all three land-use types and 15N tracers were largely immobilized in the soil organic N pool. Our study confirms that the potential for LMW organic N uptake by plants is a widespread phenomenon. However, our in-situ experiments show that in the three land-use types tested here plants are inferior competitors for LMW organic N and rely on NH 4 + as their main N source. In contrast to several previous studies in arctic, alpine and even temperate ecosystems, our study suggests that in ecosystems with intermediate N availability, mineral N is the plants’ main N source, while LMW organic N is of less ecological relevance to plant N nutrition. Article in Journal/Newspaper Arctic University of California: eScholarship Arctic Plant and Soil 325 1-2 109 121 |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
English |
topic |
Life Sciences Ecology Plant Physiology Soil Science & Conservation Plant Sciences Amino acids Glycine Microbial competition Mineral nutrition Stable isotopes |
spellingShingle |
Life Sciences Ecology Plant Physiology Soil Science & Conservation Plant Sciences Amino acids Glycine Microbial competition Mineral nutrition Stable isotopes Kahmen, Ansgar Livesley, Stephen J. Arndt, Stefan K. High potential, but low actual, glycine uptake of dominant plant species in three Australian land-use types with intermediate N availability |
topic_facet |
Life Sciences Ecology Plant Physiology Soil Science & Conservation Plant Sciences Amino acids Glycine Microbial competition Mineral nutrition Stable isotopes |
description |
The traditional view of the nitrogen (N) cycle has been challenged since the discovery that plants can compete with microbes for low molecular weight (LMW) organic N. Despite a number of studies that have shown LMW organic N uptake by plants, there remains a debate on the overall ecological relevance of LMW organic N uptake by plants across ecosystems with different N availabilities. We here report patterns of glycine N uptake by plants from three different Australian land-use types with intermediate N availability and low inherent glycine concentrations in the soil. Using 15N labeled tracers, we tested the potential of these plants to acquire glycine in ex-situ laboratory experiments and attempted to validate these results in the field by determining actual uptake of glycine by plants directly from the soil. We found in the ex-situ experiments that plants from all three land-use types were able to take up significant amounts of glycine. In contrast, glycine uptake directly from the soil was minimal in all three land-use types and 15N tracers were largely immobilized in the soil organic N pool. Our study confirms that the potential for LMW organic N uptake by plants is a widespread phenomenon. However, our in-situ experiments show that in the three land-use types tested here plants are inferior competitors for LMW organic N and rely on NH 4 + as their main N source. In contrast to several previous studies in arctic, alpine and even temperate ecosystems, our study suggests that in ecosystems with intermediate N availability, mineral N is the plants’ main N source, while LMW organic N is of less ecological relevance to plant N nutrition. |
format |
Article in Journal/Newspaper |
author |
Kahmen, Ansgar Livesley, Stephen J. Arndt, Stefan K. |
author_facet |
Kahmen, Ansgar Livesley, Stephen J. Arndt, Stefan K. |
author_sort |
Kahmen, Ansgar |
title |
High potential, but low actual, glycine uptake of dominant plant species in three Australian land-use types with intermediate N availability |
title_short |
High potential, but low actual, glycine uptake of dominant plant species in three Australian land-use types with intermediate N availability |
title_full |
High potential, but low actual, glycine uptake of dominant plant species in three Australian land-use types with intermediate N availability |
title_fullStr |
High potential, but low actual, glycine uptake of dominant plant species in three Australian land-use types with intermediate N availability |
title_full_unstemmed |
High potential, but low actual, glycine uptake of dominant plant species in three Australian land-use types with intermediate N availability |
title_sort |
high potential, but low actual, glycine uptake of dominant plant species in three australian land-use types with intermediate n availability |
publisher |
eScholarship, University of California |
publishDate |
2009 |
url |
http://www.escholarship.org/uc/item/8nv8k7br |
op_coverage |
pp 109-121 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Kahmen, Ansgar; Livesley, Stephen J.; & Arndt, Stefan K.(2009). High potential, but low actual, glycine uptake of dominant plant species in three Australian land-use types with intermediate N availability. Plant and Soil: An International Journal on Plant-Soil Relationships, 325(1), pp 109-121. doi:10.1007/s11104-009-9960-x. Retrieved from: http://www.escholarship.org/uc/item/8nv8k7br |
op_relation |
http://www.escholarship.org/uc/item/8nv8k7br qt8nv8k7br |
op_rights |
public |
op_doi |
https://doi.org/10.1007/s11104-009-9960-x |
container_title |
Plant and Soil |
container_volume |
325 |
container_issue |
1-2 |
container_start_page |
109 |
op_container_end_page |
121 |
_version_ |
1766345112757993472 |