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EMBO Rep. 2003 Jun;4(6):588-94.

Identification of the fertility restoration locus, Rfo, in radish, as a member of the pentatricopeptide-repeat protein family.

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  • 1Unité de Recherches en Génomique Végétale INRA CNRS, 2 Rue Gaston Crémieux, CP5708, 91057 Evry Cedex, France.

Abstract

Ogura cytoplasmic male sterility (CMS) in radish (Raphanus sativus) is caused by an aberrant mitochondrial gene, Orf138, that prevents the production of functional pollen without affecting female fertility. Rfo, a nuclear gene that restores male fertility, alters the expression of Orf138 at the post-transcriptional level. The Ogura CMS/Rfo two-component system is a useful model for investigating nuclear-cytoplasmic interactions, as well as the physiological basis of fertility restoration. Using a combination of positional cloning and microsynteny analysis of Arabidopsis thaliana and radish, we genetically and physically delimited the Rfo locus to a 15-kb DNA segment. Analysis of this segment shows that Rfo is a member of the pentatricopeptide repeat (PPR) family. In Arabidopsis, this family contains more than 450 members of unknown function, although most of them are predicted to be targeted to mitochondria and chloroplasts and are thought to have roles in organellar gene expression.

PMID:
12740605
PMCID:
PMC1319198
DOI:
10.1038/sj.embor.embor848
[PubMed - indexed for MEDLINE]
Free PMC Article
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