Tight coupling of root-associated nitrogen fixation and plant photosynthesis in the salt marsh grass Spartina alterniflora and carbon dioxide enhancement of nitrogenase activity
| Autor: | D C Yoch, G J Whiting, E L Gandy |
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| Jazyk: | angličtina |
| Rok vydání: | 1986 |
| Předmět: |
Chromatography
Gas Light Photosynthesis Spartina alterniflora Poaceae Applied Microbiology and Biotechnology chemistry.chemical_compound Halophyte Nitrogen Fixation Botany Nitrogenase Seawater geography geography.geographical_feature_category Ecology biology Bacteria Acetylene food and beverages Carbon Dioxide biology.organism_classification Kinetics chemistry Salt marsh Carbon dioxide Nitrogen fixation Microscopy Electron Scanning Oxidation-Reduction Food Science Biotechnology Research Article |
| Popis: | The coupling of root-associated nitrogen fixation and plant photosynthesis was examined in the salt marsh grass Spartina alterniflora. In both field experiments and hydroponic assay chambers, nitrogen fixation associated with the roots was rapidly enhanced by stimulating plant photosynthesis. A kinetic analysis of acetylene reduction activity (ARA) showed that a five-to sixfold stimulation occurred within 10 to 60 min after the plant leaves were exposed to light or increased CO2 concentrations (with the light held constant). In field experiments, CO2 enrichment increased plant-associated ARA by 27%. Further evidence of the dependence of ARA on plant photosynthate was obtained when activity in excised roots was shown to decrease after young greenhouse plants were placed in the dark. Seasonal variation in the ARA of excised plant roots from field cores appears to be related to the annual cycle of net photosynthesis in S. alterniflora. |
| Databáze: | OpenAIRE |
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