Fertility restoration of chinese wild rice-type cytoplasmic male sterility by CRISPR/Cas9-mediated genome editing of nuclear-encoded RETROGRADE-REGULATED MALE STERILITY

Chihiro Suketomo, Tomohiko Kazama, Kinya Toriyama

研究成果: Contribution to journalArticle査読

抄録

Cytoplasmic male sterility (CMS) is a trait that produces nonfunctional pollen caused by the interaction between mitochondrial and nuclear genes. In Chinese-wild (CW) type CMS, CWA, in rice (Oryza sativa L.), its mitochondria enhance the expression of the nuclear gene RETROGRADE-REGULATED MALE STERILITY (RMS), which causes pollen abortion. Fertility is recovered when its expression decreases in a restorer line, CWR. The expression of RMS is controlled by the single nucleotide polymorphism (SNP) located in the promoter region 2,286 bp upstream of the start codon of RMS. However, another gene, PPR2, which encodes pentatricopeptide repeat-domain containing protein, is predicted in the reverse strand of this region and a premature stop codon is created in CWR by the SNP. To prove RMS is directly involved in restoring fertility of CW-CMS, we introduced mutations into RMS and PPR2 using CRISPR/Cas9. Fertility was recovered in the genome-edited CMS plants with reduced expression of RMS and unaltered expression of PPR2, when the mutation was introduced in the promoter regions of RMS within or outside the coding sequence (CDS) of PPR2. Fertility restoration was not obtained when the mutation was introduced within the CDS of RMS. Our results demonstrated that PPR2 is not responsible for fertility restoration, and fertility was recovered by reduced expression of RMS, providing us with a new artificial fertility restorer line for agronomical use.

本文言語英語
ページ(範囲)1-8
ページ数8
ジャーナルPlant Biotechnology
37
3
DOI
出版ステータス出版済み - 2020
外部発表はい

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Agronomy and Crop Science
  • Plant Science

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