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Atkins CA, Storer PJ, Pate JS. Pathways of Nitrogen Assimilation in Cowpea Nodules Studied using N(2) and Allopurinol. Plant Physiol. 1988;86(1):204-7doi: 10.1104/pp.86.1.204.
Atkins, C. A., Storer, P. J., & Pate, J. S. (1988). Pathways of Nitrogen Assimilation in Cowpea Nodules Studied using N(2) and Allopurinol. Plant physiology, 86(1), 204-7. https://doi.org/10.1104/pp.86.1.204
Atkins, C A, et al. "Pathways of Nitrogen Assimilation in Cowpea Nodules Studied using N(2) and Allopurinol." Plant physiology vol. 86,1 (1988): 204-7. doi: https://doi.org/10.1104/pp.86.1.204
Atkins CA, Storer PJ, Pate JS. Pathways of Nitrogen Assimilation in Cowpea Nodules Studied using N(2) and Allopurinol. Plant Physiol. 1988 Jan;86(1):204-7. doi: 10.1104/pp.86.1.204. PMID: 16665867; PMCID: PMC1054455.
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Plant Physiol. 1988 Jan;86(1):204-7. doi: 10.1104/pp.86.1.204.

Pathways of Nitrogen Assimilation in Cowpea Nodules Studied using N(2) and Allopurinol.

Plant physiology

C A Atkins, P J Storer, J S Pate

Affiliations

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

PMID: 16665867 PMCID: PMC1054455 DOI: 10.1104/pp.86.1.204

Abstract

In the presence of 0.5 millimolar allopurinol (4-hydroxypyrazolo [3,4-d]pyrimidine), an inhibitor of NAD:xanthine oxidoreductase (EC 1.2.3.2), intact attached nodules of cowpea (Vigna unguiculata L. Walp. cv Vita 3) formed [(15)N]xanthine from (15)N(2) at rates equivalent to those of ureide synthesis, confirming the direct assimilation of fixed nitrogen into purines. Xanthine accumulated in nodules and was exported in increasing amounts in xylem of allopurinol-treated plants. Other intermediates of purine oxidation, de novo purine synthesis, and ammonia assimilation did not increase and, over the time course of experiments (4 hours), allopurinol had no effect on nitrogenase (EC 1.7.99.2) activity. Negligible (15)N-labeling of asparagine from (15)N(2) was observed, suggesting that the significant pool (up to 14 micromoles per gram of nodule fresh weight) of this amide in cowpea nodules was not formed directly from fixation but may have accumulated as a consequence of phloem delivery.

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