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MECHANISMS OF PLANT RESPONSES TO BIOTIC AND ABIOTIC STRESSES

THE ROLE OF MEMBRANE TRANSPORTERS IN THE CYTOKININ SIGNALING UPON LEGUME - RHIZOBIA SYMBIOSIS

The project NCN NZ9/03548 2015-2019 is conducted in collaboration with Institute of the Bioorganic Chemistry PAS. The PI is dr hab. Michał Jasi ski. ń This project aims at revealing and manipulating selected membrane transporters with a special emphasis on their impact on cytokinin distribution/signaling upon Legume - Rhizobia Symbiosis. Understanding the distribution of signaling molecules, is of great interest but molecular identity of their transporters is still largely unknown. Results of this study might help to decipher the cross-talk between key players orchestrating events upon nodulation. Cytokinins, an adenine-derived signaling molecules with a substitution at N-6 position, promote cell divisions as well as modulate many aspects of plant development (e.g. axillary bud growth, leaf senescence). On top of that, cytokinin’s role as the endogenous plant inducer of nodule primordia formation in legumes is nowadays well established. It is postulated that cytokinin participates in orchestrating signaling events that promote rhizobial colonization of the root cortex and limits the extent of subsequent infections at the root epidermis. Endogenous cytokinin concentration is precisely regulated in roots and depends on infection stage, plant’s needs and condition. An open question still remains whether the change in the local concentration of cytokinin is achieved by its metabolism and/or transport/perception? In agreement with recent findings that ABC transporters in other model plants like Arabidopsis may be involved in translocation of root derived active form of cytokinins we postulate the role of such membrane transporters in the cytokinin signaling upon LRS in Medicago.