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Hemoglobin (Hb) genes are ubiquitous in plants. Several classes have been identified and are expressed during infection by nitrogen-fixing symbionts, as a result of tissue hypoxia, during seed germination, and in developing (e.g. meristematic) tissues. The induction of the Hb gene by hypoxia is linked to a decrease in ATP levels and is mediated by Ca 2+ . Numerous investigations have led to...
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...
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