Complex networks of self-incompatibility signaling in the Brassicaceae

Curr Opin Plant Biol. 2010 Oct;13(5):520-6. doi: 10.1016/j.pbi.2010.06.004.

Abstract

The self-pollination barrier of self-incompatibility in the Brassicaceae is based on the activity of a polymorphic stigma receptor and its pollen ligand, whose allele-specific interaction triggers a signaling cascade within the stigma epidermal cell that culminates in the inhibition of pollen tube development. Recent analyses have identified signaling intermediates and revealed unexpected cross-talk between self-incompatibility signaling and pistil development. The self-incompatibility response is now thought to be based on a phosphorylation and ubiquitin-mediated degradation pathway that inhibits the secretion of factors required for successful pollination. Because manipulation of the identified signaling intermediates results in only partial disruption of the self-incompatibility reaction, this pathway likely functions in conjunction with other as-yet unidentified signaling pathways to effect complete inhibition of self-pollen.

Publication types

  • Research Support, U.S. Gov't, Non-P.H.S.
  • Review

MeSH terms

  • Brassicaceae / physiology*
  • Gene Expression Regulation, Plant
  • Ligands
  • Plant Proteins / metabolism
  • Pollen Tube / growth & development
  • Pollination*
  • RNA Processing, Post-Transcriptional
  • Receptor Cross-Talk
  • Signal Transduction*

Substances

  • Ligands
  • Plant Proteins