TIME ：12:40-14:00 July 7, 2021 (Wednesday)

VENUE：Room 104, Building B, School of Agriculture and Biology

ORGANIZER：Office of Discipline and Science & Technology, SAB; Young Teachers Association, SAB

TITTLE: Mechanisms and Spatial Regulation of Chloroplast Division

ABSTRACT: 

During leaf cell expansion and plant growth, the population of chloroplasts in plant cells must increase, which is crucial for photosynthetic capacity and ensures faithful inheritance of organelles during cell division. Chloroplasts are propagated through binary fission of preexisting organelles. This process is powered by a dynamic macromolecular machine positioned at the middle of the organelle. Ring-like contractile structures are assembled on both the inner and outer envelope membranes of chloroplasts. The foundation of the division machinery and first contractile structure to assemble is the stromal Filamenting temperature-sensitive Z (FtsZ) ring (Z ring), composed of the tubulin-like, self-assembling cytoskeletal protein FtsZ. The placement of the Z ring to the midplastid division site is governed by the chloroplast Min (Minicell) system, which inhibits Z-ring assembly everywhere except the division site. The central Min-system player is the FtsZ-assembly inhibitor ACCUMULATION AND REPLICATION OF CHLOROPLASTS3 (ARC3). However, the subcellular localization and the regulation of the inhibitory activity of ARC3 remains unclear. In this talk, we will update our current knowledge in terms of the function and regulation of ARC3 during chloroplast division.