Suppressed expression of retrograde-regulated male sterility restores pollen fertility in cytoplasmic male sterile rice plants

Sota Fujii, Kinya Toriyama

Research output: Contribution to journalArticlepeer-review

119 Citations (Scopus)

Abstract

Conflict/reconciliation between mitochondria and nuclei in plants is manifested by the fate of pollen (viable or nonviable) in the cytoplasmic male sterility (CMS)/fertility restoration (Rf) system. Through positional cloning, we identified a nuclear candidate gene, RETROGRADE-REGULATED MALE STERILITY (RMS) for Rf17, a fertility restorer gene for Chinese wild rice (CW)-type CMS in rice (Oryza sativa L.). RNA interference-mediated gene silencing of RMS restored fertility to a CMS plant, whereas its overexpression in the fertility restorer line induced pollen abortion. The mRNA expression level of RMS in mature anthers depended on cytoplasmic genotype, suggesting that RMS is a candidate gene to be regulated via retrograde signaling. We found that a reduced-expression allele of the RMS gene restored fertility in haploid pollen, whereas a normal-expression allele caused pollen to die in the CW-type CMS. RMS encodes a mitochondrial protein, 178 aa in length, of unknown function, unlike the majority of other Rf genes cloned thus far, which encode pentatricopeptide repeat proteins. The unique features of RMS provide novel insights into retrograde signaling and CMS.

Original languageEnglish
Pages (from-to)9513-9518
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume106
Issue number23
DOIs
Publication statusPublished - 2009 Jun 9

Keywords

  • Cytoplasmic male sterility
  • Fertility restoration
  • Mitochondria
  • Oryza sativa
  • Retrograde signaling

ASJC Scopus subject areas

  • General

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