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Arabidopsis Circadian Clock Repress Phytochrome a Signaling

The plants’ internal circadian clock can strongly influence phytochrome signaling in response to the changes in the external light environment. Phytochrome A (phyA) is the photoreceptor that mediates various far-red (FR) light responses. phyA signaling is modulated by FHY3 and FAR1, which directly a...

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Autores principales: Liu, Yang, Sun, Yanzhao, Yao, Heng, Zheng, Yanyan, Cao, Shuyuan, Wang, Haiyang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9131076/
https://www.ncbi.nlm.nih.gov/pubmed/35645991
http://dx.doi.org/10.3389/fpls.2022.809563
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author Liu, Yang
Sun, Yanzhao
Yao, Heng
Zheng, Yanyan
Cao, Shuyuan
Wang, Haiyang
author_facet Liu, Yang
Sun, Yanzhao
Yao, Heng
Zheng, Yanyan
Cao, Shuyuan
Wang, Haiyang
author_sort Liu, Yang
collection PubMed
description The plants’ internal circadian clock can strongly influence phytochrome signaling in response to the changes in the external light environment. Phytochrome A (phyA) is the photoreceptor that mediates various far-red (FR) light responses. phyA signaling is modulated by FHY3 and FAR1, which directly activate the transcription of FHY1 and FHL, whose products are essential for light-induced phyA nuclear accumulation and subsequent light responses. However, the mechanisms by which the clock regulates phyA signaling are poorly understood. Here, we discovered that FHY1 expression is diurnally regulated, peaking in the middle of the day. Two Arabidopsis core clock components, CIRCADIAN CLOCK ASSOCIATED1 (CCA1) and TIMING OF CAB EXPRESSION1 (TOC1), repress FHY3/FAR1-mediated FHY1/FHL activation. Consistently, the specific expression pattern of FHY1 under diurnal conditions is altered in cca1-1, toc1-101, CCA1, and TOC1 overexpression plants. Furthermore, far-red induced gene expression and particularly nuclear accumulation of phyA are compromised in TOC1 and CCA1 overexpression seedlings. Our results therefore revealed a previously unidentified FHY1 expression pattern in diurnal cycles, which is negatively regulated by CCA1 and TOC1.
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spelling pubmed-91310762022-05-26 Arabidopsis Circadian Clock Repress Phytochrome a Signaling Liu, Yang Sun, Yanzhao Yao, Heng Zheng, Yanyan Cao, Shuyuan Wang, Haiyang Front Plant Sci Plant Science The plants’ internal circadian clock can strongly influence phytochrome signaling in response to the changes in the external light environment. Phytochrome A (phyA) is the photoreceptor that mediates various far-red (FR) light responses. phyA signaling is modulated by FHY3 and FAR1, which directly activate the transcription of FHY1 and FHL, whose products are essential for light-induced phyA nuclear accumulation and subsequent light responses. However, the mechanisms by which the clock regulates phyA signaling are poorly understood. Here, we discovered that FHY1 expression is diurnally regulated, peaking in the middle of the day. Two Arabidopsis core clock components, CIRCADIAN CLOCK ASSOCIATED1 (CCA1) and TIMING OF CAB EXPRESSION1 (TOC1), repress FHY3/FAR1-mediated FHY1/FHL activation. Consistently, the specific expression pattern of FHY1 under diurnal conditions is altered in cca1-1, toc1-101, CCA1, and TOC1 overexpression plants. Furthermore, far-red induced gene expression and particularly nuclear accumulation of phyA are compromised in TOC1 and CCA1 overexpression seedlings. Our results therefore revealed a previously unidentified FHY1 expression pattern in diurnal cycles, which is negatively regulated by CCA1 and TOC1. Frontiers Media S.A. 2022-05-11 /pmc/articles/PMC9131076/ /pubmed/35645991 http://dx.doi.org/10.3389/fpls.2022.809563 Text en Copyright © 2022 Liu, Sun, Yao, Zheng, Cao and Wang. https://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
spellingShingle Plant Science
Liu, Yang
Sun, Yanzhao
Yao, Heng
Zheng, Yanyan
Cao, Shuyuan
Wang, Haiyang
Arabidopsis Circadian Clock Repress Phytochrome a Signaling
title Arabidopsis Circadian Clock Repress Phytochrome a Signaling
title_full Arabidopsis Circadian Clock Repress Phytochrome a Signaling
title_fullStr Arabidopsis Circadian Clock Repress Phytochrome a Signaling
title_full_unstemmed Arabidopsis Circadian Clock Repress Phytochrome a Signaling
title_short Arabidopsis Circadian Clock Repress Phytochrome a Signaling
title_sort arabidopsis circadian clock repress phytochrome a signaling
topic Plant Science
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9131076/
https://www.ncbi.nlm.nih.gov/pubmed/35645991
http://dx.doi.org/10.3389/fpls.2022.809563
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