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Regulation of glutamine synthetase glutamate synthase cycle in maize zea mays tissues effect of the nitrogen source


, : Regulation of glutamine synthetase glutamate synthase cycle in maize zea mays tissues effect of the nitrogen source. Journal of Plant Physiology 124(1-2): 147-154

Glutamine synthetase (EC. 6.3.1.2) and NADH- and ferredoxin-dependent glutamate synthetase (EC. 1.14.1.14) activities were measured in leaves, roots and callus tissues of maize exposed to different nitrogen sources. NADH-dependent glutamate synthase activity was detected in roots where the enzyme level was increased by ammonium citrate, NH4Cl plus nitrate, glutamate and urea, and in callus tissue where the level was increased by nitrate. No NADH-dependent glutamate synthase could be detected in leaves, which showed a high ferredoxin-dependent glutamate synthase activity. The level of this latter enzyme was reduced by all nitrogen sources used except for ammonium citrate and glutamate. The result suggest that NADH-dependent glutamate synthase is regulated in different ways in the tissues tested. Glutamine synthetase was strongly regulated in the leaf but not in the root. Glutamine synthetase activity was reduced by NH4Cl and increased by nitrate, ammonium citrate, glutamate, glutamine and urea. The results suggest that in the root the GS/GOGAT cycle is used as such, but that GS also synthesized glutamine, which the tissue exports for the synthesis of glutamate.

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