Nitrite-driven anaerobic ATP synthesis in barley and rice root mitochondria

@article{Stoimenova2007NitritedrivenAA,
  title={Nitrite-driven anaerobic ATP synthesis in barley and rice root mitochondria},
  author={Maria Stoimenova and Abir U. Igamberdiev and Kapuganti Jagadis Gupta and Robert D. Hill},
  journal={Planta},
  year={2007},
  volume={226},
  pages={465-474}
}
Mitochondria isolated from the roots of barley (Hordeum vulgare L.) and rice (Oryza sativa L.) seedlings were capable of oxidizing external NADH and NADPH anaerobically in the presence of nitrite. The reaction was linked to ATP synthesis and nitric oxide (NO) was a measurable product. The rates of NADH and NADPH oxidation were in the range of 12–16 nmol min−1 mg−1 protein for both species. The anaerobic ATP synthesis rate was 7–9 nmol min−1 mg−1 protein for barley and 15–17 nmol min−1 mg−1… 
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Results indicate that nitrite participates in the nitrate-mediated modulation of the fermentative metabolism of soybean roots during oxygen deficiency, and the involvement of mitochondrial reduction of nitrite to NO in this mechanism is discussed.
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The hypothesis that plant and cyanobacterial hemoglobins contribute to anaerobic nitrogen metabolism in support of an aerobic respiration and survival during hypoxia is supported.
Nitric Oxide Turnover Under Hypoxia Results in the Rapid Increased Expression of the Plastid-Localized Phosphorylated Pathway of Serine Biosynthesis
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