English Seminars
Spatially distinct activation of antagonistic salicylate
and jasmonate pathways shapes a plant immune field
| Title | Spatially distinct activation of antagonistic salicylate and jasmonate pathways shapes a plant immune field |
| Lecturer | Shigeyuki Betsuyaku, Ph. D (Tokyo University, JST PRESTO) |
| Language | English |
| Date&Time | 12/07/2015 (Mon) 16：00～17：00 |
| Venue | Bio Large seminar room(C109) |
| Detail | Multicellular organisms require precise regulation of immune responses to prevent and limit pathogen infection and to avoid excess collateral damage. Plants mount strong immune responses when they recognize pathogen's effectors (virulence-promoting molecules). Effector-triggered immunity (ETI) is typically accompanied by cell death, called hypersensitive response (HR). During HR, dead cells appear at the site of pathogen challenge, and then the surrounding live cells are thought to execute immune responses, including accumulation of antimicrobial compounds, and to spread systemic defense signals. It is proposed that the formation of such a spatiotemporal pattern of immune responses is based on a concentration gradient of salicylic acid (SA), a key molecule in plant immunity. However, difficulties in cell biology on immune receptors and regulators in planta have hampered testing this hypothesis. By exploiting a series of defense markers, we have developed a live-imaging system to trace immune responses in Arabidopsis. Our studies provide, for the first time, compelling evidence for the existence of "a plant immune field" around the infection site, and gain important insight into the underlying molecular framework. |
| Contact | 植物免疫学研究室 西條雄介 (saijo@bs.naist.jp) |