[대학원 생명과학과 세미나 안내]
연사 : 이유리 교수(서울대학교 생명과학부)
연제 : Cellular Activities and Architectures Controlling Organ Separation
일시 : 2018년 10월 12일 (금) 오후 5시
장소 : 하나과학관 A동 B131호
초청교수 : 김옥매 교수
Abstract
The cell wall, a defining feature of plants, provides a rigid structure critical for bonding cells together. To overcome this physical constraint, plants must process cell wall linkages during growth and development. However, little is known about the mechanism guiding cell-cell detachment and cell wall remodeling. I will present our recent findings to show that two neighboring cell types in Arabidopsis coordinate their activities to control cell wall processing, thereby ensure precise abscission to discard organs. One cell type produces a honeycomb structure of lignin, which acts as a mechanical ‘brace’ to localize cell wall breakdown and spatially limit abscising cells. The second cell type undergoes transdifferentiation into epidermal cells, forming protective cuticle, demonstrating de novo specification of epidermal cells, previously thought to be restricted to embryogenesis. Loss of the lignin brace leads to inadequate cuticle formation, resulting in surface barrier defects and susceptible to infection. Understanding the coordination between the two cell types will give a new insight to the abscission processes, which will be further applied to understanding general mechanisms of cell wall processing.