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Related Experiment Videos

Ureide biosynthesis in legume nodules.

Shigeyuki Tajima1, Mika Nomura, Hiroshi Kouchi

  • 1Department of Life Science, Faculty of Agriculture, Kagawa University, Kagawa 761-0795, Japan. tajima@ag.kagawa-u.ac.jp

Frontiers in Bioscience : a Journal and Virtual Library
|February 24, 2004
PubMed
Summary

Tropical legumes convert ammonia from nitrogen fixation into ureides for plant growth. Research highlights unique aspects of this symbiotic metabolism, including purine biosynthesis regulation and feedback inhibition.

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Area of Science:

  • Biochemistry
  • Plant Science
  • Symbiotic Metabolism

Background:

  • Tropical legumes, including Glycine, Phaseolus, and Vigna species, utilize symbiotic nitrogen fixation.
  • Ammonia, a direct product of this fixation, is converted into ureides (allantoin and allantoic acid).
  • These ureides serve as the primary nitrogen source translocated to the shoots.

Purpose of the Study:

  • To investigate the unique features of symbiotic metabolism in tropical legumes.
  • To explore the regulation of de novo purine biosynthesis and uricase gene expression.
  • To understand the feedback inhibition of ureides on nitrogen-fixing activity.

Main Methods:

  • Analysis of nitrogenous compounds in xylem sap.
  • Localization of metabolic pathways within nodule cells (infected and uninfected).

Related Experiment Videos

  • Examination of gene expression related to uricase.
  • Assessment of ureide feedback effects on nitrogen fixation.

    • Main Results:

    • Ureides constitute a significant portion (60-75%) of soluble nitrogen in soybean xylem sap during the reproductive phase.
    • Specific organelles (plastids, mitochondria, peroxisomes) are involved in de novo purine biosynthesis and urate oxidation for ureide production.
    • Unique regulatory mechanisms governing purine biosynthesis and uricase gene expression were identified.
    • Evidence of feedback inhibition by ureides on nitrogen-fixing activity was revealed.

    Conclusions:

    • The conversion of ammonia to ureides is a critical nitrogen transport mechanism in tropical legumes.
    • Symbiotic nitrogen fixation involves complex metabolic coordination between plant and bacterial partners.
    • Understanding these regulatory mechanisms offers insights into optimizing nitrogen use efficiency in agriculture.