Physical Environment and Symbiotic Nitrogen Fixation
نویسندگان
چکیده
منابع مشابه
Symbiotic Nitrogen Fixation.
Biosphere nitrogen is subjected to rapid turnover, and because it is eventually lost as nitrogen into the atmosphere, its maintenance requires continuous replenishment with reduced nitrogen from atmospheric nitrogen. Biological reduction of nitrogen to ammonia can be performed only by some prokaryotes and is a highly oxygen-sensitive process. The most efficient nitrogen fixers establish a symbi...
متن کاملMolecular genetics of symbiotic nitrogen fixation.
Although most organisms, including all eucaryotes, cannot assimilate atmospheric dinitrogen (N2), a group of evolutionarily divergent procaryotes are able to reduce N2 directly to ammonia (nitrogen fixation) under a variety of physiological conditions. The molecular genetics of nitrogen fixation has been studied primarily in Klebsiella pneumoniae because of its close taxonomic relation to Esche...
متن کاملOntogenetic Interactions between Photosynthesis and Symbiotic Nitrogen Fixation in Legumes.
Photosynthetic data collected from Pisum sativum L. and Phaseolus vulgaris L. plants at different stages of development were related to symbiotic N(2) fixation in the root nodules. The net carbon exchange rate of each leaf varied directly with carboxylation efficiency and inversely with the CO(2) compensation point. Net carbon exchange of the lowest leaves reputed to supply fixed carbon to root...
متن کاملNonsymbiotic and Symbiotic Nitrogen Fixation in a Weakly Minerotrophic Peatland
The acetylene reduction assay was used to measure nonsymbiotic and symbiotic nitrogen fixation in a weakly minerotrophic peatland throughout the ice-free season. Nonsymbiotic nitrogen fixation was found in surface materials and subsurface peat. In surface materials, nitrogenase activity measured in the field contributed about 0.6 kg N ha-' yr-', was closely associated with Sphagnum, but was not...
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ژورنال
عنوان ژورنال: Australian Journal of Biological Sciences
سال: 1963
ISSN: 0004-9417
DOI: 10.1071/bi9630028