Stimulation of dark CO_2 fixation by ammonia in isolated mesophyll cells of Papaver somniferum L.

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概要

• 論文の詳細を見る

• Addition of 2 mM ammonium ion to isolated mesophyll cells of Papaver somniferum resulted in a 3-fold or greater increase in their rate of dark ^<14>C fixation, while even 0.1 mM NH_4^+ nearly doubled that rate. The most rapid increase in the labeling of a metabolite occurred in aspartate, and was accompanied by a decrease in the steady-state level of labeled phosphoenolpyruvate. No change in labeled pyruvate level occurred, and alanine labeling declined. Ammonium ion addition had no effect on the respiratory rate of these cells in the dark. We conclude that NH_4^+ stimulates phosphoenolpyruvate carboxylation in this system, but has no detectable effect on the pyruvate kinase reaction in the dark. Our results are compared with earlier findings and the possible regulatory function of ammonia is discussed.

• 日本植物生理学会の論文

著者

• Bassham James

  Laboratory Of Chemical Biodynamics Lawrence Berkeley Laboratory University Of California

• Hammel Kenneth

  Laboratory of Chemical Biodynamics, Lawrence Berkeley Laboratory, University of California

• Cornwell Karen

  Laboratory of Chemical Biodynamics, Lawrence Berkeley Laboratory, University of California

• Hammel Kenneth

  Laboratory Of Chemical Biodynamics Lawrence Berkeley Laboratory University Of California

• Cornwell Karen

  Laboratory Of Chemical Biodynamics Lawrence Berkeley Laboratory University Of California

関連論文

• Ammonia Regulation of Intermediary Metabolism in Photosynthesizing and Respiring Chlorella pyrenoidosa : Comparative Effects of Methylamine
• Stimulation of dark CO_2 fixation by ammonia in isolated mesophyll cells of Papaver somniferum L.

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