SPEAKER: Youshun Lin

Tenure-track Associate Professor, Ph.D. Supervisor, PI

Department of Plant Science, SAB

TIME ：12:40-14:00 June 7th, 2023 (Wed)

VENUE：Room 104, Building B, SAB

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

                             Young Teachers Association, SAB

TITLE：Plant organelles in the regulation of stress tolerance

ABSTRACT：

With global warming, climate change, and frequent high temperatures, it will lead to severe yield loss of crop plants, including 6.0% reduction in wheat, 3.2% reduction in rice, 7.4% reduction in maize, and 3.1% reduction in soybean, which will not be able to meet the needs of the growing population and cause food insecurity, posing a great challenge to the sustainable agriculture in the future. Therefore, it is important to explore new genes involved in heat stress tolerance, to elucidate the molecular mechanism of high temperature resilience, and to breed highly tolerant new crop varieties. Our collaborative research results firstly identified a quantitative trait locus TT3 consisting of two genes TT3.1 and TT3.2 to form a genetic module conferring rice thermotolerance. In responce to heat stress, TT3.1 rapidly internalized into endosomal compartments to recruit and ubiquitinate chloroplast precursor protein TT3.2, thereby preventing TT3.2 from being accumulated in the chloroplast and thus maintaining chloroplast homeostasis. We also firstly uncovered that TT3.1 as a potential thermosensor of crop plants. In addition, autophagy also plays an important role in stress resilience, and this presentation will also introduce a molecular mechanism of autophagosome formation mediated by small G protein signalling.