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Autor: Urbankova, Ivana

1 záznamů v Medvik Filtry

Článek

Light Controls Cytokinin Signaling via Transcriptional Regulation of Constitutively Active Sensor Histidine Kinase CKI1

Dobisova, Tereza
Autor Dobisova, Tereza CEITEC - Central European Institute of Technology and National Centre for Biomolecular Research, Masaryk University, CZ-62500, Brno, Czech Republic (T.D., V.H., S.M., I.U., R.H., P.Z., M.P., E.B., J.H.) and Institute of Science and Technology Austria, 3400 Klosterneuburg, Austria (C.C., P.Z., E.B.)
Hrdinova, Vendula
Autor Hrdinova, Vendula CEITEC - Central European Institute of Technology and National Centre for Biomolecular Research, Masaryk University, CZ-62500, Brno, Czech Republic (T.D., V.H., S.M., I.U., R.H., P.Z., M.P., E.B., J.H.) and Institute of Science and Technology Austria, 3400 Klosterneuburg, Austria (C.C., P.Z., E.B.)
Cuesta, Candela
Autor Cuesta, Candela CEITEC - Central European Institute of Technology and National Centre for Biomolecular Research, Masaryk University, CZ-62500, Brno, Czech Republic (T.D., V.H., S.M., I.U., R.H., P.Z., M.P., E.B., J.H.) and Institute of Science and Technology Austria, 3400 Klosterneuburg, Austria (C.C., P.Z., E.B.)
Michlickova, Sarka
Autor Michlickova, Sarka CEITEC - Central European Institute of Technology and National Centre for Biomolecular Research, Masaryk University, CZ-62500, Brno, Czech Republic (T.D., V.H., S.M., I.U., R.H., P.Z., M.P., E.B., J.H.) and Institute of Science and Technology Austria, 3400 Klosterneuburg, Austria (C.C., P.Z., E.B.)
Urbankova, Ivana
Autor Urbankova, Ivana CEITEC - Central European Institute of Technology and National Centre for Biomolecular Research, Masaryk University, CZ-62500, Brno, Czech Republic (T.D., V.H., S.M., I.U., R.H., P.Z., M.P., E.B., J.H.) and Institute of Science and Technology Austria, 3400 Klosterneuburg, Austria (C.C., P.Z., E.B.)
Hejatkova, Romana
Autor Hejatkova, Romana CEITEC - Central European Institute of Technology and National Centre for Biomolecular Research, Masaryk University, CZ-62500, Brno, Czech Republic (T.D., V.H., S.M., I.U., R.H., P.Z., M.P., E.B., J.H.) and Institute of Science and Technology Austria, 3400 Klosterneuburg, Austria (C.C., P.Z., E.B.)
Zadnikova, Petra
Autor Zadnikova, Petra CEITEC - Central European Institute of Technology and National Centre for Biomolecular Research, Masaryk University, CZ-62500, Brno, Czech Republic (T.D., V.H., S.M., I.U., R.H., P.Z., M.P., E.B., J.H.) and Institute of Science and Technology Austria, 3400 Klosterneuburg, Austria (C.C., P.Z., E.B.)
Pernisova, Marketa
Autor Pernisova, Marketa CEITEC - Central European Institute of Technology and National Centre for Biomolecular Research, Masaryk University, CZ-62500, Brno, Czech Republic (T.D., V.H., S.M., I.U., R.H., P.Z., M.P., E.B., J.H.) and Institute of Science and Technology Austria, 3400 Klosterneuburg, Austria (C.C., P.Z., E.B.)
Benkova, Eva
Autor Benkova, Eva CEITEC - Central European Institute of Technology and National Centre for Biomolecular Research, Masaryk University, CZ-62500, Brno, Czech Republic (T.D., V.H., S.M., I.U., R.H., P.Z., M.P., E.B., J.H.) and Institute of Science and Technology Austria, 3400 Klosterneuburg, Austria (C.C., P.Z., E.B.)
Hejatko, Jan
Autor Hejatko, Jan CEITEC - Central European Institute of Technology and National Centre for Biomolecular Research, Masaryk University, CZ-62500, Brno, Czech Republic (T.D., V.H., S.M., I.U., R.H., P.Z., M.P., E.B., J.H.) and Institute of Science and Technology Austria, 3400 Klosterneuburg, Austria (C.C., P.Z., E.B.) hejatko@sci.muni.cz

Plant physiology. 2017 ; 174 (1) : 387-404. [pub] 20170314

Plant Physiol
ISSN 1532-2548
Medvik
Zdroj

In plants, the multistep phosphorelay (MSP) pathway mediates a range of regulatory processes, including those activated by cytokinins. The cross talk between cytokinin response and light has been known for a long time. However, the molecular mechanism underlying the interaction between light and cytokinin signaling remains elusive. In the screen for upstream regulators we identified a LONG PALE HYPOCOTYL (LPH) gene whose activity is indispensable for spatiotemporally correct expression of CYTOKININ INDEPENDENT1 (CKI1), encoding the constitutively active sensor His kinase that activates MSP signaling. lph is a new allele of HEME OXYGENASE1 (HY1) that encodes the key protein in the biosynthesis of phytochromobilin, a cofactor of photoconvertible phytochromes. Our analysis confirmed the light-dependent regulation of the CKI1 expression pattern. We show that CKI1 expression is under the control of phytochrome A (phyA), functioning as a dual (both positive and negative) regulator of CKI1 expression, presumably via the phyA-regulated transcription factors (TF) PHYTOCHROME INTERACTING FACTOR3 and CIRCADIAN CLOCK ASSOCIATED1. Changes in CKI1 expression observed in lph/hy1-7 and phy mutants correlate with misregulation of MSP signaling, changed cytokinin sensitivity, and developmental aberrations that were previously shown to be associated with cytokinin and/or CKI1 action. Besides that, we demonstrate a novel role of phyA-dependent CKI1 expression in the hypocotyl elongation and hook development during skotomorphogenesis. Based on these results, we propose that the light-dependent regulation of CKI1 provides a plausible mechanistic link underlying the well-known interaction between light- and cytokinin-controlled plant development.

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