Complex networks of self-incompatibility signaling in the Brassicaceae.
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.
Tantikanjana
Titima
T
Department of Plant Biology, 412 Mann Library Building, Cornell University, Ithaca, NY 14853, USA.
Nasrallah
Mikhail E
ME
Nasrallah
June B
JB
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
D008024:Ligands; D010940:Plant Proteins