AMBIENTUM BIOETHICA BIOLOGIA CHEMIA DIGITALIA DRAMATICA EDUCATIO ARTIS GYMNAST. ENGINEERING EPHEMERIDES EUROPAEA GEOGRAPHIA GEOLOGIA HISTORIA HISTORIA ARTIUM INFORMATICA IURISPRUDENTIA MATHEMATICA MUSICA NEGOTIA OECONOMICA PHILOLOGIA PHILOSOPHIA PHYSICA POLITICA PSYCHOLOGIA-PAEDAGOGIA SOCIOLOGIA THEOLOGIA CATHOLICA THEOLOGIA CATHOLICA LATIN THEOLOGIA GR.-CATH. VARAD THEOLOGIA ORTHODOXA THEOLOGIA REF. TRANSYLVAN
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Authors: GÁBOR RIGÓ, FERHAN AYAYDIN, GYÖNGYI SZÉKELY, DORINA PODAR, LAURA ZSIGMOND, HAJNALKA KOVÁCS, ANNAMARIA KIRÁLY, OLAF TIETZ, KLAUS PALME, LÁSZLÓ SZABADOS, CSABA KONCZ, ÁGNES CSÉPLŐ.
Due to global warming of overall climate, it is an increasing demand to breed plant cultivars tolerant to high salt concentration in order to improve their chance to survive deleterious effects of abiotic stress conditions. Our aim is - within the frame of a Hungarian-Romanian TET (TET_12_RO_1-2013-0010) - to characterize and compare abiotic stress response regulatory genes arised from Arabidopsis and extremely high salt tolerant picoalgae. Identification of a set of cDNAs conferring dominant stress tolerance phenotypes was described in Arabidopsis (Papdi et al., 2008). Two Ser/Thr protein kinases (from this set line N022 and the CRK5) were chosen for abiotic stress response investigations. Preliminarly, we functionally characterized the CRK5 protein kinase which is involved in regulation of gravitropic responses of A. thaliana roots (Rigo et al., 2013). CRK5 is a PM-associated kinase that forms U-shaped patterns facing outer lateral walls of root epidermis cells. CRK5 phosphorylates hydrophilic loop of PIN2 in vitro, and PIN2 shows accelerated accumulation in brefeldin bodies in crk5 mutant. Delayed gravitropic response of crk5 mutant thus likely reflects defective phosphorylation of PIN2 and deceleration of its brefeldin-sensitive membrane recycling. In future, we would like to investigate role of CRK5 protein kinase in NO signaling also. We expect to find new information about role of NO molecule in auxin signaling and oxidative stress. Additionally, for comparative studies, we plan to investigate the osmotic and oxidative responses of the other protein kinase, line N022, which has unknown function yet. Acknowledgement. This work was supported by the Hungarian-Romanian grant TET_12_RO_ 1-2013-0010 and Romanian-Hungarian Bilateral Cooperation project 2013-2014/668.
