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. 1992 Feb;98(2):411–421. doi: 10.1104/pp.98.2.411

Effects of Anoxia on Mitochondrial Biogenesis in Rice Shoots

Modification of in Organello Translation Characteristics

Ivan Couée 1,2, Séverine Defontaine 1,2, Jean-Pierre Carde 1,2, Alain Pradet 1,2
PMCID: PMC1080204  PMID: 16668655

Abstract

Shoots of germinating rice (Oryza sativa L.) seedlings are able to grow under anoxia and to withstand long periods of anoxic treatment. Mitochondria were purified from aerobically germinated and anaerobically treated rice shoots by differential and isopycnic centrifugation and were found to consist of two subpopulations. The mitochondrial subpopulation of higher density was used for further characterization. Ultrastructural studies showed anaerobic mitochondria to be significantly different from aerobic mitochondria, with a matrix of lower density and more developed cristae. Aerobic and anaerobic mitochondria also differed in their specific activities for fumarase and succinate dehydrogenase, which were significantly lower after the anoxic treatment. In vivo labeling of seedlings with l-[35S]methionine and subsequent isolation of the mitochondria indicated that anoxia induced a drastic decrease, but not a total inactivation, of the synthesis of mitochondrial proteins. In organello protein synthesis showed that anaerobic mitochondria were able to synthesize most of the polypeptides synthesized by aerobic mitochondria, although only in the presence of exogenous ATP, as would occur under anoxia. Anaerobic mitochondria, but not aerobic mitochondria, could carry out protein synthesis without a functional respiratory chain. Thus, mitochondrial protein synthesis was found to be potentially functional in the rice shoot under anoxia.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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