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Metabolism and translocation of fixed nitrogen in the nodulated legume

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Summary

Nitrogen (N2) fixed by Rhizobium bacteroids in the legume nodule is excreted as ammonia to the surrounding host cell where it is efficiently assimilated into the amide group of glutamine. Generally glutamine is a minor exported solute of nitrogen, being further metabolised to asparagine in temperate species and to the ureides, allantoin and allantoic acid in tropical species. These solutes serve as the principal translocated forms of nitrogen in xylem. Compartmentalisation of the pathways of nitrogen metabolism and the role of ammonia in regulation of their activity is examined in nodules of both asparagine-forming (Lupinus albus L.) and ureide-forming (Vigna unguiculata L. Walp) symbioses.

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  1. Department of Botany, University of Western Australia, 6009, Nedlands, WA, Australia

    C. A. Atkins

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Atkins, C.A. Metabolism and translocation of fixed nitrogen in the nodulated legume. Plant Soil 100, 157–169 (1987). https://doi.org/10.1007/BF02370939

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