title: Complex networks of self-incompatibility signaling in the Brassicaceae.
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.
authors.affiliation: Department of Plant Biology, 412 Mann Library Building, Cornell University, Ithaca, NY 14853, USA.
authors.forename: Titima
authors.initials: T
authors.lastname: Tantikanjana
authors.forename: Mikhail E
authors.initials: ME
authors.lastname: Nasrallah
authors.forename: June B
authors.initials: JB
authors.lastname: Nasrallah
mesh_terms: D019607:Brassicaceae / Q000502:physiology*; D018506:Gene Expression Regulation, Plant; D008024:Ligands; D010940:Plant Proteins / Q000378:metabolism; D053205:Pollen Tube / Q000254:growth & development; D054817:Pollination; D012323:RNA Processing, Post-Transcriptional; D020239:Receptor Cross-Talk; D015398:Signal Transduction
chemical_list: D008024:Ligands; D010940:Plant Proteins