[IIGB_All] Special Seminar From Dr. Dr. Yongbiao Xue - RNase-based Self-Incompatibility in Angiosperms: Degradation, Phase Separation, and Evolution

[IIGBadmin]

Special Seminar tomorrow at 2pm in the Genomics Auditorium:


RNase-based Self-Incompatibility in Angiosperms: Degradation, Phase Separation, and Evolution


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Dr. Yongbiao Xue is a Professor of Plant Molecular Genetics and a Group Leader at the Institute of Genetics and Developmental Biology, Chinese Academy of Sciences. He earned his Ph.D. in Plant Molecular Biology from University of East Anglia and the John Innes Center and subsequently completed postdoctoral research at both the University of Oxford and the John Innes Center. His lab adopts an interdisciplinary approach to explore the molecular and evolutionary mechanisms underlying self-incompatibility in angiosperms.



S-RNase-based Self-Incompatibility in Angiosperms: Degradation, Phase Separation, and Evolution

Yongbiao Xue

Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, China

Angiosperms, with over 300,000 identified species, are the most diverse group of plants. A key characteristic of approximately half of these species is self-incompatibility, an intraspecific reproductive barrier that prevents hermaphroditic plants from producing seeds through self-pollination. This trait is governed by a multi-allelic genetic locus known as the S-locus, which encodes both female (pistil) and male (pollen) S factors responsible for self-incompatibility. Recent studies have revealed the role of the pistil S factor, S-RNase, in families such as Solanaceae, Plantaginaceae, Rosaceae, and Rutaceae. S-RNase interacts with pollen S factors, SLFs (S-locus F-box proteins), to control cross-pollen compatibility and self-pollen incompatibility. This control occurs through two distinct mechanisms: the ubiquitin 26S proteasome degradation pathway and liquid-liquid phase separation of S-RNases. Phylogenetic analyses have shown that S-RNase-based self-incompatibility is the most ancient form of this phenomenon, tracing back to the early evolutionary stages of angiosperms during the Cretaceous period. These insights enhance our understanding of the molecular mechanisms underlying self and non-self recognition in angiosperms and their evolutionary trajectory.

Hailing Jin, Ph.D.
Professor & Cy Mouradick Endowed Chair
Department of Microbiology & Plant Pathology
Center for Plant Cell Biology
Institute for Integrative Genome Biology
University of California
Riverside, CA 92521
Phone: 951-827-7995
https://sites.google.com/a/ucr.edu/dr-hailing-jin-s-laboratory/homepage



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