Tongjun Sun joined the Ecological Genomics Center of AGIS as a research professor in February 2021. During his Ph.D. and postdoc careers at University of British Columbia, he mainly focused on signal transduction and regulation in plant immunity. His past studies identified receptors of the plant defense hormone salicylic acid (SA) and uncovered important immune regulators of signaling pathways mediated by SA and the plant defense molecule N-hydroxypipecolic acid (NHP).