| Description: | [DBS Seminar] Prof. Maitrayee DasGupta (Department of Biochemistry, University of Calcutta) -- 'Deregulated Symbiosis receptor kinase hyperactivates spontaneous nodulation |
| Date: | Wednesday, Sep 16, 2015 |
| Time: | 2 p.m. - 3 p.m. |
| Venue: | 110, Lecture Hall Complex |
| Details: | Plants undertake symbioses with nitrogen-fixing bacteria that renders them independent of nitrogen fertilizer. A compatible interaction triggers the 'Symbiosis response pathway' (Sym pathway) to initiate the genetic reprogramming required for intracellular colonization of symbionts in the newly divided cells of specialized structures called nodules that develop on the roots of the host plant. This property of root nodule symbiosis is restricted to a monophyletic clade of four angiosperm orders. Gain-of-function alleles of some 'Sym pathway' genes can uncouple organogenesis from infection and cause a development of empty spontaneous nodules in the absence of the bacterial symbiont. The efficiency of spontaneous nodulation under constitutive activity of these genes was either same or lower than the rhizobia induced nodulation. Nevertheless these were important signaling modules for transfering the capacity for symbiosis to plants that are unable to obtain symbiotically fixed nitrogen. Our efforts have shown that deregulated activation of Symbiosis Receptor Kinase, an upstream receptor kinase of the 'Sym pathway' hyperactivated nodule organogenesis and seems to have overcome the controls of both nodule number and their spatial positioning. |
| Calendar: | Seminar Calendar (entered by abhadra) |