Abstract:
Successful sexual reproduction in angiosperms relies on a multilevel signaling mechanism between female and male organs, and there is still a lack of systematic understanding of its molecular regulatory mechanisms. In pollen-stigma interactions studies, we revealed for the first time the lock-and-key regulatory mechanism in pollen-stigma interactions, and found that pollen minipeptides bind to pistil receptor kinases by competing for stigma minipeptides, further initiating the stigma affinity response and promoting pollen germination. These works reveal the molecular mechanism by which receptor kinases specifically recognize and convert different peptide ligands to achieve precise regulation of plant development. In the study of pollen tube growth regulation mechanism, we identified a novel co-receptor that acts as a molecular chaperone to mediate the intracellular translocation of receptor kinase, and also resolved the signaling pathway of small peptide-receptor kinase-co-receptor complex to regulate the rapid polar growth of the cell through ROS. In the study of downstream mechanisms, we found that the plant hormone growth hormone regulates the oxidative modification of the TIR1/AFB2 receptor through activation of the receptor kinase-ROS pathway, which promotes its translocation into the nucleus and triggers an intranuclear transcriptional response. These studies have deepened our understanding of the mechanism of small peptide-receptor kinase-mediated intercellular signaling exchange in plants and provided an important theoretical basis for distant hybrid breeding.
Speaker: Prof. Chao Li
Affiliation: East China Normal University
Time: 4:30 PM, Tuesday, Apr. 1, 2025
Venue: Offline: Room 101 in Kunming Division
Online: Tencent Meeting ID：130 896 110
