[대학원 생명과학과 세미나 안내]
연사 : 박충모 교수(서울대 화학과)
연제 : Thermal adaptation of autotrophic development
일시 : 2016년 10월 14일 (금) 오후 4시
장소 : 하나과학관 A동 109호
초청교수 : 김옥매 교수
Abstract
Chlorophyll biosynthesis enables autotrophic development of developing seedlings in plants. Upon light exposure, the chlorophyll precursor protochlorophyllide produces reactive oxygen species (ROS). Developing seedlings acquire photosynthetic competence through the action of protochlorophyllide oxidoreductases (PORs) that convert protochlorophyllide to chlorophyllide, reducing ROS production that would otherwise induce cellular damages and chlorophyll bleaching. Here, we show that FCA facilitates the thermal induction of POR genes to trigger the conversion of protochlorophyllide to chlorophyllide in developing seedlings. We found that FCA triggers POR induction at high ambient temperature by promoting the accessibility of RNA polymerases to the gene promoters, shifting chlorophyll-ROS balance towards autotrophic development. We propose that the FCA-mediated thermal adaptation of autotrophic development allows developing seedlings to cope with the heat-absorbing soil surface layer under natural conditions.