Rice FLOURY ENDOSPERM10 encodes a pentatricopeptide repeat protein that is essential for the trans-splicing of mitochondrial nad1 intron 1 and endosperm development.

Endosperm, the major storage organ in cereal grains, determines grain yield and quality. Despite the fact that a role for P-type pentatricopeptide repeat (PPR) proteins in the regulation of endosperm development has emerged, molecular functions of many P-type PPR proteins remain obscure. Here, we report a rice endosperm defective mutant, floury endosperm10 (flo10), which developed smaller starch grains in starchy endosperm and abnormal cells in the aleurone layer. Map-based cloning and rescued experiments showed that FLO10 encodes a P-type PPR protein with 26 PPR motifs, which is localized to mitochondria. Loss of function of FLO10 affected the trans-splicing of the mitochondrial nad1 intron 1, which was accompanied by the increased accumulation of the nad1 exon 1 and exons 2-5 precursors. The failed formation of mature nad1 led to a dramatically decreased assembly and activity of complex I, reduced ATP production, and changed mitochondrial morphology. In addition, loss of function of FLO10 significantly induced an alternative respiratory pathway involving alternative oxidase. These results reveal that FLO10 plays an important role in the maintenance of mitochondrial function and endosperm development through its effect on the trans-splicing of the mitochondrial nad1 intron 1 in rice.

• Publication year

  2019

• Venue

  New Phytologist

• Publication date

  2019-04-17

• Fields of study

  Biology, Medicine

• Identifiers
  DOI 10.1111/nph.15814PMID 30916395
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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