Insights into the Prunus-Specific S-RNase-Based Self-Incompatibility System from a Genome-Wide Analysis of the Evolutionary Radiation of S Locus-Related F-box Genes

Takashi Akagi, Isabelle M. Henry, Takuya Morimoto, Ryutaro Tao

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Self-incompatibility (SI) is an important plant reproduction mechanism that facilitates the maintenance of genetic diversity within species. Three plant families, the Solanaceae, Rosaceae and Plantaginaceae, share an S-RNase-based gametophytic SI (GSI) system that involves a single S-RNase as the pistil S determinant and several F-box genes as pollen S determinants that act via non-self-recognition. Previous evidence has suggested a specific self-recognition mechanism in Prunus (Rosaceae), raising questions about the generality of the S-RNase-based GSI system. We investigated the evolution of the pollen S determinant by comparing the sequences of the Prunus S haplotype-specific F-box gene (SFB) with those of its orthologs in other angiosperm genomes. Our results indicate that the Prunus SFB does not cluster with the pollen S of other plants and diverged early after the establishment of the Eudicots. Our results further indicate multiple F-box gene duplication events, specifically in the Rosaceae family, and suggest that the Prunus SFB gene originated in a recent Prunus-specific gene duplication event. Transcriptomic and evolutionary analyses of the Prunus S paralogs are consistent with the establishment of a Prunus-specific SI system, and the possibility of subfunctionalization differentiating the newly generated SFB from the original pollen S determinant.

Original languageEnglish
Pages (from-to)1281-1294
Number of pages14
JournalPlant and Cell Physiology
Volume57
Issue number6
DOIs
Publication statusPublished - Jun 1 2016
Externally publishedYes

Keywords

  • Evolutionary analysis
  • F-box gene
  • Gene duplication
  • Prunus
  • Rosaceae
  • S-RNase-based self-incompatibility

ASJC Scopus subject areas

  • Physiology
  • Plant Science
  • Cell Biology

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