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Biochemical aspects of nitrogen metabolism in a whole plant context

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Fundamental, Ecological and Agricultural Aspects of Nitrogen Metabolism in Higher Plants

Part of the book series: Developments in Plant and Soil Sciences ((DPSS,volume 19))

Summary

In addition to supplies of ammonia from the soil the principal sources of ammonia in the root are the reduction of nitrate or dinitrogen. The major fate of ammonia is its conversion to amides or ureides. Once made these fixed forms of nitrogen are either incorporated into root protein or are transported to the leaves. Factors such as levels of nitrate reductase and phosphoenolpyruvate carboxylase could be limiting either the initial reduction of nitrate or the net synthesis of the amides or ureides. Experiments designed to alter these possible limitations will be considered. In leaves, ammonia supplied by nitrate reduction is much less than that potentially available through photorespiration, and as a result its fate is masked. Its principal fate, however, must be the formation of those amino acids required for the net synthesis of leaf proteins. In this paper the strategies used by root or leaf cells in the synthesis and utilization of ammonia and a possible role for glutamate dehydrogenase will be considered.

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Abbreviations

AOA:

aminooxyacetate

FCCP:

carbonyl-cyanide-p-trifluoromethoxy-phenylhydrazone

GDH:

glutamate dehydrogenase

GOG AT:

glutamate synthase

GS:

glutamine synthetase

MSX:

methionine sulfoximine

PEPC:

phosphoenolpyruvate carboxylase

SHAM:

salicylhydroxamic acid

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Authors and Affiliations

  1. Department of Biology, McMaster University, Hamilton, Ontario, L8S 4KS, Canada

    Ann Oaks

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Editors and Affiliations

  1. Department of Plant Ecology, University of Utrecht, Utrecht, The Netherlands

    H. Lambers

  2. Institute for Soil Fertility, Haren, The Netherlands

    J. J. Neeteson

  3. Department of Plant Physiology, University of Groningen, Haren, The Netherlands

    I. Stulen

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© 1986 Martinus Nijhoff Publishers, Dordrecht/Boston/Lancaster

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Oaks, A. (1986). Biochemical aspects of nitrogen metabolism in a whole plant context. In: Lambers, H., Neeteson, J.J., Stulen, I. (eds) Fundamental, Ecological and Agricultural Aspects of Nitrogen Metabolism in Higher Plants. Developments in Plant and Soil Sciences, vol 19. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-4356-8_19

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