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Dehydroascorbate reduction in plant mitochondria is coupled to the respiratory electron transfer chain

, : Dehydroascorbate reduction in plant mitochondria is coupled to the respiratory electron transfer chain. Physiologia plantarum 129(1): 225-232

The reduction of dehydroascorbate (DHA) was investigated in plant mitochondria. Mitochondria isolated from Bright Yellow-2 tobacco cells were incubated with 1 mM of DHA, and the ascorbate generation was followed by high-performance liquid chromatography. Mitochondria showed clear ability to reduce DHA and to maintain a significant level of ascorbate. Ascorbate generation could be stimulated by the respiratory substrate succinate. The complex I substrate malate and the complex I inhibitor rotenone had no effect on the ascorbate generation from DHA. Similarly, the complex III inhibitor antimycin A, the alternative oxidase inhibitor salicylhydroxamic acid, and the uncoupling agent 2,4-dinitrophenol were ineffective on mitochondrial ascorbate generation both in the absence and in the presence of succinate. However, the competitive succinate dehydrogenase inhibitor malonate almost completely abolished the succinate-dependent increase in ascorbate production. The complex IV inhibitor KCN strongly stimulated ascorbate accumulation. These results together suggest that the mitochondrial respiratory chain of plant cells - presumably complex II - plays important role in the regeneration of ascorbate from its oxidized form, DHA.


DOI: 10.1111/j.1399-3054.2006.00810.x

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