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Related Experiment Videos

Asparagine formation in soybean nodules.

S Fujihara1, M Yamaguchi

  • 1Department of Agricultural Chemistry, College of Agriculture, University of Osaka Prefecture, 4-cho, Mozu-umemachi, Sakai, Osaka 591, Japan.

Plant Physiology
|July 1, 1980
PubMed
Summary

Soybean root nodules efficiently metabolize supplied (15)NH4+ and (15)N-amide-glutamine into various nitrogen compounds. Results reveal active glutamine-amide asparagine synthesis pathways in these nodules.

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Area of Science:

  • Plant Biology
  • Biochemistry
  • Nitrogen Metabolism

Background:

  • Soybean root nodules are crucial for symbiotic nitrogen fixation.
  • Understanding nitrogen metabolism within nodules is key to improving crop yields.

Purpose of the Study:

  • To investigate the metabolic fate of ammonium and glutamine in soybean root nodules.
  • To identify nitrogen assimilation pathways and key enzymes involved.

Main Methods:

  • Detached soybean nodules were vacuum infiltrated with (15)NH4+ or [(15)N](amide)-glutamine.
  • Nitrogen incorporation and metabolism were analyzed over 60 minutes of incubation.

Main Results:

  • (15)NH4+ was incorporated into glutamine, glutamate, asparagine, and alanine.
  • (15)N abundance was highest in glutamine's amide nitrogen from (15)NH4+ feeding.
  • Asparagine's amide nitrogen showed the highest (15)N enrichment after 60 minutes, especially when fed [(15)N](amide)-glutamine.

Conclusions:

  • Soybean root nodules possess active glutamine-amide asparagine synthesizing systems.
  • These findings highlight the dynamic nitrogen metabolism and assimilation processes within soybean nodules.

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