Integration of Nitrate and Ammonium Assimilation in Higher Plants
Because of its role in proteins and nucleic acids, nitrogen can be viewed as the central element around which carbon metabolism is organized in living material. Nitrogen accumulates to high levels in soils and vegetation of natural systems but it is strongly limiting to the productivity of most agricultural systems. One reason is that more nitrogen is removed in exploitation than returns from sources such as rainfall, dust, seed and fixation by free-living or symbiotic bacteria. Another is that the annual plants as employed in agriculture are capable of placing greater demands on nutrient cycling than occur in natural systems. The result is that nitrogen economy is a critical issue in crop management and thus also in agricultural research.
KeywordsNitrate Reductase Glutamine Synthetase Nitrate Reduction Glutamic Dehydrogenase Nitrate Uptake
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