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What Does the Molecular Genetics of Different Types of Restorer-of-Fertility Genes Imply?

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Title: What Does the Molecular Genetics of Different Types of Restorer-of-Fertility Genes Imply?
Authors: Kubo, Tomohiko Browse this author →KAKEN DB
Arakawa, Takumi Browse this author
Honma, Yujiro Browse this author →KAKEN DB
Kitazaki, Kazuyoshi Browse this author →KAKEN DB
Keywords: cytoplasmic male sterility
hybrid breeding
nuclear-mitochondrial interaction
Issue Date: 13-Mar-2020
Publisher: MDPI
Journal Title: Plants
Volume: 9
Issue: 3
Start Page: 361
Publisher DOI: 10.3390/plants9030361
Abstract: Cytoplasmic male sterility (CMS) is a widely used trait for hybrid seed production. Although male sterility is caused by S cytoplasm (male-sterility inducing mitochondria), the action of S cytoplasm is suppressed by restorer-of-fertility (Rf), a nuclear gene. Hence, the genetics of Rf has attained particular interest among plant breeders. The genetic model posits Rf diversity in which an Rf specifically suppresses the cognate S cytoplasm. Molecular analysis of Rf loci in plants has identified various genes; however, pentatricopeptide repeat (PPR) protein (a specific type of RNA-binding protein) is so prominent as the Rf-gene product that Rfs have been categorized into two classes, PPR and non-PPR. In contrast, several shared features between PPR- and some non-PPR Rfs are apparent, suggesting the possibility of another grouping. Our present focus is to group Rfs by molecular genetic classes other than the presence of PPRs. We propose three categories that define partially overlapping groups of Rfs: association with post-transcriptional regulation of mitochondrial gene expression, resistance gene-like copy number variation at the locus, and lack of a direct link to S-orf (a mitochondrial ORF associated with CMS). These groups appear to reflect their own evolutionary background and their mechanism of conferring S cytoplasm specificity.
Rights: © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (
Type: article
Appears in Collections:農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 久保 友彦

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