Plant Physiol. Drug Metab Dispos
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Plant Physiology 72:22-25 (1983)
© 1983 American Society of Plant Biologists

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Articles

Glutamine Synthetases of Higher Plants 1

Evidence for a Specific Isoform Content Related to Their Possible Physiological Role and Their Compartmentation within the Leaf

Sheila F. McNally, Bertrand Hirel, Pierre Gadal, A. Fred Mann and George R. Stewart

School of Botany, Trinity College, University of Dublin, Dublin 2, Eire, Physiologie Végétale Métabolique, ERA au CNRS No. 799, Université de Paris Sud, Bat 430, 91405 Orsay Cedex, France, Department of Botany, Birbeck College, University of London, London WC1E 7HX, Great Britain

The chromatographic properties of glutamine synthetase isoforms have been investigated in a wide range of higher plant leaves and shoots using ion exchange chromatography. Different patterns of glutamine synthetase isoform content were observed. Among higher plants, four patterns or groups could be recognized. The first group is characterized by having only cytosolic glutamine synthetase, whereas the second group is distinguished by having only chloroplastic glutamine synthetase. The third group is characterized by cytosolic glutamine synthetase being a minor component of the total leaf glutamine synthetase activity. The fourth group is distinct from the other groups in having high cytosolic and chloroplast glutamine synthetase activity. Immunological studies have been undertaken on a few species from each group to identify unambiguously both cytosolic and chloroplastic glutamine synthetases.

1 Supported by Grant Recherche Cooperative sur Programme no. 389, by Grant no. 7870445 for the Délégation Générale à la Recherche Scientifique et Technique, and by the Agricultural Research Council.




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