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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 a Jan HEJÁTKO. Light Controls Cytokinin Signaling via Transcriptional Regulation of Constitutively Active Sensor Histidine Kinase CKI1. Online. \textit{Plant Physiology}. American Society of Plant Physiologists, 2017, roč.~174, č.~1, s.~387-404. ISSN~0032-0889. Dostupné z: https://dx.doi.org/10.1104/pp.16.01964. [citováno 2024-04-23]
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