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...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2022-05-01
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| Series: | Frontiers in Plant Science |
| Subjects: | |
| Online Access: | https://www.frontiersin.org/articles/10.3389/fpls.2022.809563/full |
| _version_ | 1811305496330633216 |
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| author | Yang Liu Yang Liu Yanzhao Sun Heng Yao Yanyan Zheng Shuyuan Cao Haiyang Wang |
| author_facet | Yang Liu Yang Liu Yanzhao Sun Heng Yao Yanyan Zheng Shuyuan Cao Haiyang Wang |
| author_sort | Yang Liu |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-04-13T08:27:29Z |
| format | Article |
| id | doaj.art-07582dae64cc41b3896819f488a81210 |
| institution | Directory Open Access Journal |
| issn | 1664-462X |
| language | English |
| last_indexed | 2024-04-13T08:27:29Z |
| publishDate | 2022-05-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Plant Science |
| spelling | doaj.art-07582dae64cc41b3896819f488a812102022-12-22T02:54:22ZengFrontiers Media S.A.Frontiers in Plant Science1664-462X2022-05-011310.3389/fpls.2022.809563809563Arabidopsis Circadian Clock Repress Phytochrome a SignalingYang Liu0Yang Liu1Yanzhao Sun2Heng Yao3Yanyan Zheng4Shuyuan Cao5Haiyang Wang6College of Horticulture, China Agricultural University, Beijing, ChinaState Key Laboratory of Agrobiotechnology, China Agricultural University, Beijing, ChinaCollege of Horticulture, China Agricultural University, Beijing, ChinaCollege of Horticulture, China Agricultural University, Beijing, ChinaCollege of Horticulture, China Agricultural University, Beijing, ChinaCollege of Horticulture, China Agricultural University, Beijing, ChinaCollege of Life Sciences, South China Agricultural University, Guangzhou, ChinaThe 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.https://www.frontiersin.org/articles/10.3389/fpls.2022.809563/fullFHY3/FAR1FHY1/FHLTOC1CCA1PHYAclock |
| spellingShingle | Yang Liu Yang Liu Yanzhao Sun Heng Yao Yanyan Zheng Shuyuan Cao Haiyang Wang Arabidopsis Circadian Clock Repress Phytochrome a Signaling Frontiers in Plant Science FHY3/FAR1 FHY1/FHL TOC1 CCA1 PHYA clock |
| 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 | FHY3/FAR1 FHY1/FHL TOC1 CCA1 PHYA clock |
| url | https://www.frontiersin.org/articles/10.3389/fpls.2022.809563/full |
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