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@article{1375197,
author = {Dobisová, Tereza and Hrdinová, Vendula and Cuesta, Candela and Michlíčková, Šárka and Urbánková, Ivana and Hejátková, Romana and Žádníková, Petra and Pernisová, Markéta and Benková, Eva and Hejátko, Jan},
article_number = {1},
doi = {http://dx.doi.org/10.1104/pp.16.01964},
keywords = {light; cytokinin; signalling; CKI1},
language = {eng},
issn = {0032-0889},
journal = {Plant Physiology},
title = {Light Controls Cytokinin Signaling via Transcriptional Regulation of Constitutively Active Sensor Histidine Kinase CKI1},
url = {https://academic.oup.com/plphys/article/174/1/387/6116747},
volume = {174},
year = {2017}
}
TY - JOUR
ID - 1375197
AU - Dobisová, Tereza - Hrdinová, Vendula - Cuesta, Candela - Michlíčková, Šárka - Urbánková, Ivana - Hejátková, Romana - Žádníková, Petra - Pernisová, Markéta - Benková, Eva - Hejátko, Jan
PY - 2017
TI - Light Controls Cytokinin Signaling via Transcriptional Regulation of Constitutively Active Sensor Histidine Kinase CKI1
JF - Plant Physiology
VL - 174
IS - 1
SP - 387-404
EP - 387-404
PB - American Society of Plant Physiologists
SN - 00320889
KW - light
KW - cytokinin
KW - signalling
KW - CKI1
UR - https://academic.oup.com/plphys/article/174/1/387/6116747
N2 - In plants, the multistep phosphorelay (MSP) pathway mediates a range of regulatory processes, including those activated by cytokinins. The crosstalk between cytokinin response and light is 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 INDEPENDENT-1 (CKI1), encoding the constitutively active sensor histidine kinase that activates MSP signaling. lph is a new allele of HEME OXYGENASE 1 (HY1) which 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 PHYTOCHROME INTERACTING FACTOR 3 (PIF3) and CIRCADIAN CLOCK ASSOCIATED 1 (CCA1). Changes in CKI1 expression observed in lph/hy1-7 and phy mutants correlate with misregulation of MSP signaling, changed cytokinin sensitivity and developmental aberrations, previously shown to be associated with cytokinin and/or CKI1 action. Besides that, we demonstrate 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.
ER -
DOBISOVÁ, Tereza, Vendula HRDINOVÁ, Candela CUESTA, Šárka MICHLÍČKOVÁ, Ivana URBÁNKOVÁ, Romana HEJÁTKOVÁ, Petra ŽÁDNÍKOVÁ, Markéta PERNISOVÁ, Eva BENKOVÁ and Jan HEJÁTKO. Light Controls Cytokinin Signaling via Transcriptional Regulation of Constitutively Active Sensor Histidine Kinase CKI1. \textit{Plant Physiology}. American Society of Plant Physiologists, vol.~174, No~1, p.~387-404. ISSN~0032-0889. doi:10.1104/pp.16.01964. 2017.
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