Inter‐specific variability in organic nitrogen uptake of three temperate grassland species
| Autor: | Alexandra Weigelt, Roland Bol, Richard D. Bardgett, Rosalind F. King |
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| Rok vydání: | 2003 |
| Předmět: |
availability
amino-acids Glycine Soil Science arbuscular mycorrhizal fungi Plant Science complex mixtures Lolium perenne Grassland Botany Mycorrhiza Holcus lanatus Agrostis capillaris geography Soil Fauna geography.geographical_feature_category biology Chemistry Communities food and beverages Plant biology.organism_classification field patches Arbuscular mycorrhiza Microbes Agronomy Shoot Soil water |
| Zdroj: | Journal of Plant Nutrition and Soil Science. 166:606-611 |
| ISSN: | 1522-2624 1436-8730 |
| DOI: | 10.1002/jpln.200320322 |
| Popis: | We tested the inter-specific variability in the ability of three dominant grasses of temperate grasslands to take up organic nitrogen (N) in the form of amino acids in soils of differing fertility. Amino acid uptake was determined by injecting dual labeled glycine-2-C-13-N-15 into the soil, and then measuring the enrichment of both C-13 and N-15 in plant tissue after 50 hours. We found enrichment of both C-13 and N-15 in root and shoot material of all species in both soils, providing first evidence for direct uptake of glycine. We show that there was considerable inter-specific variability in amino acid uptake in the low fertility soil. Here, direct uptake of amino acid was greater in the grass Agrostis capillaris, which typically dominates low fertility grassland, than Lolium perenne, which inhabits more fertile sites. Direct uptake of amino acid for Holcus lanatus was intermediate between the above two species. Unlike in the low fertility soil, there was no difference in uptake of either C-13 or N-15 by grasses in the high fertility soil, where uptake of mineral N is thought to be the major mechanism of N uptake of these grasses. Overall, our findings may contribute to our understanding of differences in competitive interactions between grasses in soils of different fertility status. |
| Databáze: | OpenAIRE |
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