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Background  The pollen function of cytoplasmic male sterile (CMS) plants is often recovered by the  Restorer of fertility  ( Rf ) gene encoded by the nuclear genome. An  Rf  gene of Lead rice type CMS,  Rf2 , encodes a small mitochondrial glycine-rich protein. RF2 is expected to function by interacting with other proteins, because RF2 has no motifs except for glycine-rich domain.    Findings  To elucidate the protein that interacts with RF2, we performed yeast two-hybrid screening. We identified four genes and named  RF2-interacting candidate factors  ( RIF1  to  RIF4 ). A study of subcellular localization demonstrated that only RIF2 was targeted to mitochondria. A pull-down assay using  E. coli -produced recombinant GST-tagged RF2 and His-tagged RIF2 confirmed that RF2 interacted with RIF2.  RIF2  encodes ubiquitin domain-containing protein.    Conclusions  These results suggest that RIF2 is a candidate factor of a fertility restoration complex of RF2.    Electronic supplementary material  The online version of this article (doi:10.1186/s12284-014-0021-6) contains supplementary material, which is available to authorized users.

A candidate factor that interacts with RF2, a restorer of fertility of Lead rice-type cytoplasmic male sterility in rice