51
|
Ge XM, Hu X, Zhang J, Huang QM, Gao Y, Li ZQ, Li S, He JM. UV RESISTANCE LOCUS8 mediates ultraviolet-B-induced stomatal closure in an ethylene-dependent manner. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2020; 301:110679. [PMID: 33218642 DOI: 10.1016/j.plantsci.2020.110679] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2020] [Revised: 09/07/2020] [Accepted: 09/13/2020] [Indexed: 06/11/2023]
Abstract
Although the UV RESISTANCE LOCUS 8 (UVR8)-CONSTITUTIVELY PHOTOMORPHOGENIC1 (COP1)-ELONGATED HYPOCOTYL5 (HY5) signaling pathway, ethylene, hydrogen peroxide (H2O2), and nitric oxide (NO) all participate in ultraviolet-B (UV-B)-triggered stomatal closing, their interrelationship is not clear. Here, we found that UV-B-induced the expression of ethylene biosynthetic genes, production of ethylene, H2O2, and NO, and stomata closing were impaired in uvr8, cop1, and hy5 mutants. UV-B-induced NO production and stomata closing were also defective in mutants for ETHYLENE RESPONSE 1 (ETR1), ETHYLENE INSENSITIVE 2 (EIN2), and EIN3, but UV-B-triggered H2O2 generation was only inhibited in etr1. In either the absence or presence of UV-B, ethylene triggered H2O2 production but not NO generation and stomatal closure in cop1 and hy5, and stomata closing in cop1 and hy5 was induced by NO but not H2O2. Moreover, NO production and stomatal closure were constitutively caused by over-expression of COP1 or HY5 in ein2 and ein3, but not by over-expression of EIN2 or EIN3 in cop1 and hy5. Our data indicate that the UVR8-COP1-HY5 signaling module mediates UV-B-induced ethylene production, ethylene is then perceived by ETR1 to induce H2O2 synthesis. H2O2 induces NO generation and subsequent stomata closing via an EIN2, EIN3, COP1, and HY5-dependent pathway(s).
Collapse
Affiliation(s)
- Xiao-Min Ge
- School of Life Science, Shaanxi Normal University, Xi'an, 710119, China; State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an, 271018, China
| | - Xin Hu
- School of Life Science, Shaanxi Normal University, Xi'an, 710119, China
| | - Jun Zhang
- School of Life Science, Shaanxi Normal University, Xi'an, 710119, China
| | - Qin-Mei Huang
- School of Life Science, Shaanxi Normal University, Xi'an, 710119, China
| | - Yuan Gao
- School of Life Science, Shaanxi Normal University, Xi'an, 710119, China
| | - Zhong-Qi Li
- School of Life Science, Shaanxi Normal University, Xi'an, 710119, China
| | - Sha Li
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an, 271018, China
| | - Jun-Min He
- School of Life Science, Shaanxi Normal University, Xi'an, 710119, China.
| |
Collapse
|
52
|
Liang T, Shi C, Peng Y, Tan H, Xin P, Yang Y, Wang F, Li X, Chu J, Huang J, Yin Y, Liu H. Brassinosteroid-Activated BRI1-EMS-SUPPRESSOR 1 Inhibits Flavonoid Biosynthesis and Coordinates Growth and UV-B Stress Responses in Plants. THE PLANT CELL 2020; 32:3224-3239. [PMID: 32796123 PMCID: PMC7534464 DOI: 10.1105/tpc.20.00048] [Citation(s) in RCA: 62] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2020] [Revised: 07/13/2020] [Accepted: 08/10/2020] [Indexed: 05/20/2023]
Abstract
UV-B light is a potential stress factor in plants, but how plants coordinate growth and UV-B stress responses is not well understood. Here, we report that brassinosteroid (BR) signaling inhibits UV-B stress responses in Arabidopsis (Arabidopsis thaliana) and various crops by controlling flavonol biosynthesis. We further demonstrate that BRI1-EMS-SUPPRESSOR 1 (BES1) mediates the tradeoff between plant growth and UV-B defense responses. BES1, a master transcription factor involved in BR signaling, represses the expression of transcription factor genes MYB11, MYB12, and MYB111, which activate flavonol biosynthesis. BES1 directly binds to the promoters of these MYBs in a BR-enhanced manner to repress their expression, thereby reducing flavonol accumulation. However, exposure to broadband UV-B down-regulates BES1 expression, thus promoting flavonol accumulation. These findings demonstrate that BR-activated BES1 not only promotes growth but also inhibits flavonoid biosynthesis. UV-B stress suppresses the expression of BES1 to allocate energy to flavonoid biosynthesis and UV-B stress responses, allowing plants to switch from growth to UV-B stress responses in a timely manner.
Collapse
Affiliation(s)
- Tong Liang
- National Key Laboratory of Plant Molecular Genetics (NKLPMG), CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology (SIPPE), Chinese Academy of Sciences, 200032 Shanghai, People's Republic of China
- University of Chinese Academy of Sciences, Shanghai 200032, People's Republic of China
| | - Chen Shi
- National Key Laboratory of Plant Molecular Genetics (NKLPMG), CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology (SIPPE), Chinese Academy of Sciences, 200032 Shanghai, People's Republic of China
- University of Chinese Academy of Sciences, Shanghai 200032, People's Republic of China
| | - Yao Peng
- National Key Laboratory of Plant Molecular Genetics (NKLPMG), CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology (SIPPE), Chinese Academy of Sciences, 200032 Shanghai, People's Republic of China
- University of Chinese Academy of Sciences, Shanghai 200032, People's Republic of China
| | - Huijuan Tan
- National Key Laboratory of Plant Molecular Genetics (NKLPMG), CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology (SIPPE), Chinese Academy of Sciences, 200032 Shanghai, People's Republic of China
- University of Chinese Academy of Sciences, Shanghai 200032, People's Republic of China
| | - Peiyong Xin
- National Centre for Plant Gene Research (Beijing), Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, People's Republic of China
| | - Yu Yang
- National Key Laboratory of Plant Molecular Genetics (NKLPMG), CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology (SIPPE), Chinese Academy of Sciences, 200032 Shanghai, People's Republic of China
- University of Chinese Academy of Sciences, Shanghai 200032, People's Republic of China
| | - Fei Wang
- National Key Laboratory of Plant Molecular Genetics (NKLPMG), CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology (SIPPE), Chinese Academy of Sciences, 200032 Shanghai, People's Republic of China
| | - Xu Li
- National Key Laboratory of Plant Molecular Genetics (NKLPMG), CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology (SIPPE), Chinese Academy of Sciences, 200032 Shanghai, People's Republic of China
| | - Jinfang Chu
- National Centre for Plant Gene Research (Beijing), Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, People's Republic of China
| | - Jirong Huang
- College of Life and Environmental Sciences, Shanghai Normal University, Shanghai 200234, People's Republic of China
| | - Yanhai Yin
- Department of Genetics, Development and Cell Biology, Iowa State University, Ames, Iowa 50011
| | - Hongtao Liu
- National Key Laboratory of Plant Molecular Genetics (NKLPMG), CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology (SIPPE), Chinese Academy of Sciences, 200032 Shanghai, People's Republic of China
| |
Collapse
|
53
|
Yadav A, Singh D, Lingwan M, Yadukrishnan P, Masakapalli SK, Datta S. Light signaling and UV-B-mediated plant growth regulation. JOURNAL OF INTEGRATIVE PLANT BIOLOGY 2020; 62:1270-1292. [PMID: 32237196 DOI: 10.1111/jipb.12932] [Citation(s) in RCA: 80] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2020] [Accepted: 03/26/2020] [Indexed: 05/05/2023]
Abstract
Light plays an important role in plants' growth and development throughout their life cycle. Plants alter their morphological features in response to light cues of varying intensity and quality. Dedicated photoreceptors help plants to perceive light signals of different wavelengths. Activated photoreceptors stimulate the downstream signaling cascades that lead to extensive gene expression changes responsible for physiological and developmental responses. Proteins such as ELONGATED HYPOCOTYL5 (HY5) and CONSTITUTIVELY PHOTOMORPHOGENIC 1 (COP1) act as important factors which modulate light-regulated gene expression, especially during seedling development. These factors function as central regulatory intermediates not only in red, far-red, and blue light pathways but also in the UV-B signaling pathway. UV-B radiation makes up only a minor fraction of sunlight, yet it imparts many positive and negative effects on plant growth. Studies on UV-B perception, signaling, and response in plants has considerably surged in recent times. Plants have developed different strategies to use UV-B as a developmental cue as well as to withstand high doses of UV-B radiation. Plants' responses to UV-B are an integration of its cross-talks with both environmental factors and phytohormones. This review outlines the current developments in light signaling with a major focus on UV-B-mediated plant growth regulation.
Collapse
Affiliation(s)
- Arpita Yadav
- Department of Biological Sciences, Indian Institute of Science Education and Research (IISER) Bhopal, Bhopal, Madhya Pradesh, 462066, India
| | - Deeksha Singh
- Department of Biological Sciences, Indian Institute of Science Education and Research (IISER) Bhopal, Bhopal, Madhya Pradesh, 462066, India
| | - Maneesh Lingwan
- School of Basic Sciences, Indian Institute of Technology (IIT) Mandi, Kamand, Himachal Pradesh, 175005, India
| | - Premachandran Yadukrishnan
- Department of Biological Sciences, Indian Institute of Science Education and Research (IISER) Bhopal, Bhopal, Madhya Pradesh, 462066, India
| | - Shyam Kumar Masakapalli
- School of Basic Sciences, Indian Institute of Technology (IIT) Mandi, Kamand, Himachal Pradesh, 175005, India
| | - Sourav Datta
- Department of Biological Sciences, Indian Institute of Science Education and Research (IISER) Bhopal, Bhopal, Madhya Pradesh, 462066, India
| |
Collapse
|
54
|
Bursch K, Toledo-Ortiz G, Pireyre M, Lohr M, Braatz C, Johansson H. Identification of BBX proteins as rate-limiting cofactors of HY5. NATURE PLANTS 2020; 6:921-928. [PMID: 32661279 DOI: 10.1038/s41477-020-0725-0] [Citation(s) in RCA: 68] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2019] [Accepted: 06/11/2020] [Indexed: 05/04/2023]
Abstract
As a source of both energy and environmental information, monitoring of incoming light is crucial for plants to optimize growth throughout development1. Concordantly, the light signalling pathways in plants are highly integrated with numerous other regulatory pathways2,3. One of these signal integrators is the basic leucine zipper domain (bZIP) transcription factor LONG HYPOCOTYL 5 (HY5), which has a key role as a positive regulator of light signalling in plants4,5. Although HY5 is thought to act as a DNA-binding transcriptional regulator6,7, the lack of any apparent transactivation domain8 makes it unclear how HY5 is able to accomplish its many functions. Here we describe the identification of three B-box containing proteins (BBX20, BBX21 and BBX22) as essential partners for HY5-dependent modulation of hypocotyl elongation, anthocyanin accumulation and transcriptional regulation. The bbx20 bbx21 bbx22 (bbx202122) triple mutant mimics the phenotypes of hy5 in the light and its ability to suppress the cop1 mutant phenotype in darkness. Furthermore, 84% of genes that exhibit differential expression in bbx202122 are also regulated by HY5, and we provide evidence that HY5 requires the B-box proteins for transcriptional regulation. Finally, expression of a truncated dark-stable version of HY5 (HY5(ΔN77)) together with BBX21 mutated in its VP motif strongly promoted de-etiolation in dark-grown seedlings, demonstrating the functional interdependence of these factors. In sum, this work clarifies long-standing questions regarding HY5 action and provides an example of how a master regulator might gain both specificity and dynamicity through the obligate dependence of cofactors.
Collapse
Affiliation(s)
- Katharina Bursch
- Institute of Biology/Applied Genetics, Dahlem Centre of Plant Sciences (DCPS), Freie Universität Berlin, Berlin, Germany
| | | | - Marie Pireyre
- Department of Botany and Plant Biology, Section of Biology, Faculty of Sciences, University of Geneva, Geneva, Switzerland
| | - Miriam Lohr
- Institute of Biology/Applied Genetics, Dahlem Centre of Plant Sciences (DCPS), Freie Universität Berlin, Berlin, Germany
| | - Cordula Braatz
- Institute of Biology/Applied Genetics, Dahlem Centre of Plant Sciences (DCPS), Freie Universität Berlin, Berlin, Germany
| | - Henrik Johansson
- Institute of Biology/Applied Genetics, Dahlem Centre of Plant Sciences (DCPS), Freie Universität Berlin, Berlin, Germany.
| |
Collapse
|
55
|
Ponnu J. Molecular mechanisms suppressing COP1/SPA E3 ubiquitin ligase activity in blue light. PHYSIOLOGIA PLANTARUM 2020; 169:418-429. [PMID: 32248530 DOI: 10.1111/ppl.13103] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2020] [Revised: 03/19/2020] [Accepted: 03/27/2020] [Indexed: 05/23/2023]
Abstract
Arabidopsis CONSTITUTIVE PHOTOMORPHOGENIC1/SUPPRESSOR OF PHYA-105 (COP1/SPA) is an E3 ubiquitin ligase complex that prevents photomorphogenesis in darkness by ubiquitinating and subsequently degrading light-responsive transcription factors. Upon light perception, photoreceptors directly interact with the COP1/SPA complex to suppress its activity. In blue light (450-500 nm of visible spectrum), COP1/SPA activity is inhibited by the cryptochrome photoreceptors (CRY1 and CRY2), FKF1 from the ZEITLUPE family as well as phytochrome A. Together, these photoreceptors regulate vital aspects of plant growth and development from seedling stage to the induction of flowering. This review presents and discusses the recent advances in blue light-mediated suppression of COP1/SPA activity.
Collapse
Affiliation(s)
- Jathish Ponnu
- Botanical Institute and Cluster of Excellence on Plant Sciences (CEPLAS), Biocenter, University of Cologne, 50674 Cologne, Germany
| |
Collapse
|
56
|
Jarad M, Antoniou-Kourounioti R, Hepworth J, Qüesta JI. Unique and contrasting effects of light and temperature cues on plant transcriptional programs. Transcription 2020; 11:134-159. [PMID: 33016207 PMCID: PMC7714439 DOI: 10.1080/21541264.2020.1820299] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Revised: 08/26/2020] [Accepted: 08/31/2020] [Indexed: 12/12/2022] Open
Abstract
Plants have adapted to tolerate and survive constantly changing environmental conditions by reprogramming gene expression in response to stress or to drive developmental transitions. Among the many signals that plants perceive, light and temperature are of particular interest due to their intensely fluctuating nature which is combined with a long-term seasonal trend. Whereas specific receptors are key in the light-sensing mechanism, the identity of plant thermosensors for high and low temperatures remains far from fully addressed. This review aims at discussing common as well as divergent characteristics of gene expression regulation in plants, controlled by light and temperature. Light and temperature signaling control the abundance of specific transcription factors, as well as the dynamics of co-transcriptional processes such as RNA polymerase elongation rate and alternative splicing patterns. Additionally, sensing both types of cues modulates gene expression by altering the chromatin landscape and through the induction of long non-coding RNAs (lncRNAs). However, while light sensing is channeled through dedicated receptors, temperature can broadly affect chemical reactions inside plant cells. Thus, direct thermal modifications of the transcriptional machinery add another level of complexity to plant transcriptional regulation. Besides the rapid transcriptome changes that follow perception of environmental signals, plant developmental transitions and acquisition of stress tolerance depend on long-term maintenance of transcriptional states (active or silenced genes). Thus, the rapid transcriptional response to the signal (Phase I) can be distinguished from the long-term memory of the acquired transcriptional state (Phase II - remembering the signal). In this review we discuss recent advances in light and temperature signal perception, integration and memory in Arabidopsis thaliana, focusing on transcriptional regulation and highlighting the contrasting and unique features of each type of cue in the process.
Collapse
Affiliation(s)
- Mai Jarad
- Centre for Research in Agricultural Genomics (CRAG), CSIC-IRTA-UAB-UB, Campus UAB, Barcelona, Spain
| | | | - Jo Hepworth
- John Innes Centre, Norwich Research Park, Norwich, UK
| | - Julia I. Qüesta
- Centre for Research in Agricultural Genomics (CRAG), CSIC-IRTA-UAB-UB, Campus UAB, Barcelona, Spain
| |
Collapse
|
57
|
Abstract
DELLA transcriptional regulators are central components in the control of plant growth responses to the environment. This control is considered to be mediated by changes in the metabolism of the hormones gibberellins (GAs), which promote the degradation of DELLAs. However, here we show that warm temperature or shade reduced the stability of a GA-insensitive DELLA allele in Arabidopsis thaliana Furthermore, the degradation of DELLA induced by the warmth preceded changes in GA levels and depended on the E3 ubiquitin ligase CONSTITUTIVELY PHOTOMORPHOGENIC1 (COP1). COP1 enhanced the degradation of normal and GA-insensitive DELLA alleles when coexpressed in Nicotiana benthamiana. DELLA proteins physically interacted with COP1 in yeast, mammalian, and plant cells. This interaction was enhanced by the COP1 complex partner SUPRESSOR OF phyA-105 1 (SPA1). The level of ubiquitination of DELLA was enhanced by COP1 and COP1 ubiquitinated DELLA proteins in vitro. We propose that DELLAs are destabilized not only by the canonical GA-dependent pathway but also by COP1 and that this control is relevant for growth responses to shade and warm temperature.
Collapse
|
58
|
Tavridou E, Schmid-Siegert E, Fankhauser C, Ulm R. UVR8-mediated inhibition of shade avoidance involves HFR1 stabilization in Arabidopsis. PLoS Genet 2020; 16:e1008797. [PMID: 32392219 PMCID: PMC7241853 DOI: 10.1371/journal.pgen.1008797] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Revised: 05/21/2020] [Accepted: 04/26/2020] [Indexed: 11/19/2022] Open
Abstract
Sun-loving plants perceive the proximity of potential light-competing neighboring plants as a reduction in the red:far-red ratio (R:FR), which elicits a suite of responses called the "shade avoidance syndrome" (SAS). Changes in R:FR are primarily perceived by phytochrome B (phyB), whereas UV-B perceived by UV RESISTANCE LOCUS 8 (UVR8) elicits opposing responses to provide a counterbalance to SAS, including reduced shade-induced hypocotyl and petiole elongation. Here we show at the genome-wide level that UVR8 broadly suppresses shade-induced gene expression. A subset of this gene regulation is dependent on the UVR8-stabilized atypical bHLH transcription regulator LONG HYPOCOTYL IN FAR-RED 1 (HFR1), which functions in part redundantly with PHYTOCHROME INTERACTING FACTOR 3-LIKE 1 (PIL1). In parallel, UVR8 signaling decreases protein levels of the key positive regulators of SAS, namely the bHLH transcription factors PHYTOCHROME INTERACTING FACTOR 4 (PIF4) and PIF5, in a COP1-dependent but HFR1-independent manner. We propose that UV-B antagonizes SAS via two mechanisms: degradation of PIF4 and PIF5, and HFR1- and PIL1-mediated inhibition of PIF4 and PIF5 function. This work highlights the importance of typical and atypical bHLH transcription regulators for the integration of light signals from different photoreceptors and provides further mechanistic insight into the crosstalk of UVR8 signaling and SAS.
Collapse
Affiliation(s)
- Eleni Tavridou
- Department of Botany and Plant Biology, Section of Biology, Faculty of Science, University of Geneva, CH, Geneva, Switzerland
- Institute of Genetics and Genomics of Geneva (iGE3), University of Geneva, Geneva, Switzerland
| | - Emanuel Schmid-Siegert
- SIB-Swiss Institute of Bioinformatics, University of Lausanne, CH, Lausanne, Switzerland
| | - Christian Fankhauser
- Center for Integrative Genomics, Faculty of Biology and Medicine, University of Lausanne, CH, Lausanne, Switzerland
| | - Roman Ulm
- Department of Botany and Plant Biology, Section of Biology, Faculty of Science, University of Geneva, CH, Geneva, Switzerland
- Institute of Genetics and Genomics of Geneva (iGE3), University of Geneva, Geneva, Switzerland
- * E-mail:
| |
Collapse
|
59
|
Qian C, Chen Z, Liu Q, Mao W, Chen Y, Tian W, Liu Y, Han J, Ouyang X, Huang X. Coordinated Transcriptional Regulation by the UV-B Photoreceptor and Multiple Transcription Factors for Plant UV-B Responses. MOLECULAR PLANT 2020; 13:777-792. [PMID: 32126287 DOI: 10.1016/j.molp.2020.02.015] [Citation(s) in RCA: 57] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2019] [Revised: 11/08/2019] [Accepted: 02/26/2020] [Indexed: 05/12/2023]
Abstract
Non-damaging ultraviolet B (UV-B) light promotes photomorphogenic development and stress acclimation through UV-B-specific signal transduction in Arabidopsis. UV-B irradiation induces monomerization and nuclear translocation of the UV-B photoreceptor UV RESISTANCE LOCUS 8 (UVR8). However, it is not clear how the nuclear localization of UVR8 leads to changes in global gene expression. Here, we reveal that nuclear UVR8 governs UV-B-responsive transcriptional networks in concert with several previously known transcription factors, including ELONGATED HYPOCOTYL 5 (HY5) and PHYTOCHROME INTERACTING FACTOR 4 (PIF4). Based on the transcriptomic analysis, we identify MYB13 as a novel positive regulator in UV-B-induced cotyledon expansion and stress acclimation. MYB13 is UV-B inducible and is predominantly expressed in the cotyledons. Our results demonstrate that MYB13 protein functions as a transcription factor to regulate the expression of genes involved in auxin response and flavonoid biosynthesis through direct binding with their promoters. In addition, photoactivated UVR8 interacts with MYB13 in a UV-B-dependent manner and differentially modulates the affinity of MYB13 with its targets. Taken together, our results elucidate the cooperative function of the UV-B photoreceptor UVR8 with various transcription factors in the nucleus to orchestrate the expression of specific sets of downstream genes and, ultimately, mediate plant responses to UV-B light.
Collapse
Affiliation(s)
- Chongzhen Qian
- State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Xiamen University, Xiamen 361102, China
| | - Zhiren Chen
- State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Xiamen University, Xiamen 361102, China
| | - Qing Liu
- State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Xiamen University, Xiamen 361102, China
| | - Weiwei Mao
- State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Xiamen University, Xiamen 361102, China
| | - Yanling Chen
- State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Xiamen University, Xiamen 361102, China
| | - Wei Tian
- State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Xiamen University, Xiamen 361102, China
| | - Yan Liu
- State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Xiamen University, Xiamen 361102, China
| | - Jiupan Han
- State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Xiamen University, Xiamen 361102, China
| | - Xinhao Ouyang
- State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Xiamen University, Xiamen 361102, China
| | - Xi Huang
- State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Xiamen University, Xiamen 361102, China.
| |
Collapse
|
60
|
Quantitative Proteomic Analyses Identify STO/BBX24 -Related Proteins Induced by UV-B. Int J Mol Sci 2020; 21:ijms21072496. [PMID: 32260266 PMCID: PMC7178263 DOI: 10.3390/ijms21072496] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2020] [Revised: 03/30/2020] [Accepted: 03/31/2020] [Indexed: 12/18/2022] Open
Abstract
Plants use solar radiation for photosynthesis and are inevitably exposed to UV-B. To adapt to UV-B radiation, plants have evolved a sophisticated strategy, but the mechanism is not well understood. We have previously reported that STO (salt tolerance)/BBX24 is a negative regulator of UV-B-induced photomorphogenesis. However, there is limited knowledge of the regulatory network of STO in UV-B signaling. Here, we report the identification of proteins differentially expressed in the wild type (WT) and sto mutant after UV-B radiation by iTRAQ (isobaric tags for relative and absolute quantitation)-based proteomic analysis to explore differential proteins that depend on STO and UV-B signaling. A total of 8212 proteins were successfully identified, 221 of them were STO-dependent proteins in UV-B irradiated plants. The abundances of STO-dependent PSB and LHC (light-harvesting complex) proteins in sto mutants decreased under UV-B radiation, suggesting that STO is necessary to maintain the normal accumulation of photosynthetic system complex under UV-B radiation to facilitate photosynthesis photon capture. The abundance of phenylalanine lyase-1 (PAL1), chalcone synthetase (CHS), and flavonoid synthetase (FLS) increased significantly after UV-B irradiation, suggesting that the accumulation of flavonoids do not require STO, but UV-B is needed. Under UV-B radiation, STO stabilizes the structure of antenna protein complex by maintaining the accumulation of PSBs and LHCs, thereby enhancing the non-photochemical quenching (NPQ) ability, releasing extra energy, protecting photosynthesis, and ultimately promoting the elongation of hypocotyl. The accumulation of flavonoid synthesis key proteins is independent of STO under UV-B radiation. Overall, our results provide a comprehensive regulatory network of STO in UV-B signaling.
Collapse
|
61
|
Cryptochrome-mediated blue-light signalling modulates UVR8 photoreceptor activity and contributes to UV-B tolerance in Arabidopsis. Nat Commun 2020; 11:1323. [PMID: 32165634 PMCID: PMC7067804 DOI: 10.1038/s41467-020-15133-y] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2019] [Accepted: 02/18/2020] [Indexed: 12/16/2022] Open
Abstract
UV-B constitutes a critical part of the sunlight reaching the earth surface. The homodimeric plant UV-B photoreceptor UV RESISTANCE LOCUS 8 (UVR8) monomerizes in response to UV-B and induces photomorphogenic responses, including UV-B acclimation and tolerance. REPRESSOR OF UV-B PHOTOMORPHOGENESIS 1 (RUP1) and RUP2 are negative feedback regulators that operate by facilitating UVR8 ground state reversion through re-dimerization. Here we show that RUP1 and RUP2 are transcriptionally induced by cryptochrome photoreceptors in response to blue light, which is dependent on the bZIP transcriptional regulator ELONGATED HYPOCOTYL 5 (HY5). Elevated RUP1 and RUP2 levels under blue light enhance UVR8 re-dimerization, thereby negatively regulating UVR8 signalling and providing photoreceptor pathway cross-regulation in a polychromatic light environment, as is the case in nature. We further show that cryptochrome 1, as well as the red-light photoreceptor phytochrome B, contribute to UV-B tolerance redundantly with UVR8. Thus, photoreceptors for both visible light and UV-B regulate UV-B tolerance through an intricate interplay allowing the integration of diverse sunlight signals. The Arabidopsis UVR8 photoreceptor is a dimer that monomerizes in response to UV-B. Here the authors show that cryptochromes contribute to UV tolerance and facilitate UVR8 redimerization via induction of RUP proteins in response to blue light, modifying UV-B signalling in polychromatic light environments.
Collapse
|
62
|
Yang Y, Liu H. Coordinated Shoot and Root Responses to Light Signaling in Arabidopsis. PLANT COMMUNICATIONS 2020; 1:100026. [PMID: 33367230 PMCID: PMC7748005 DOI: 10.1016/j.xplc.2020.100026] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2019] [Revised: 01/14/2020] [Accepted: 01/16/2020] [Indexed: 05/05/2023]
Abstract
Light is one of the most important environmental signals and regulates many biological processes in plants. Studies on light-regulated development have mainly focused on aspects of shoot growth, such as de-etiolation, cotyledon opening, inhibition of hypocotyl elongation, flowering, and anthocyanin accumulation. However, recent studies have demonstrated that light is also involved in regulating root growth and development in Arabidopsis. In this review, we summarize the progress in understanding how shoots and roots coordinate their responses to light through different light-signaling components and pathways, including the COP1 (CONSTITUTIVELY PHOTOMORPHOGENIC 1), HY5 (ELONGATED HYPOCOTYL 5), and MYB73/MYB77 (MYB DOMAIN PROTEIN 73/77) pathways.
Collapse
Affiliation(s)
- Yu Yang
- National Key Laboratory of Plant Molecular Genetics (NKLPMG), CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology (SIPPE), Chinese Academy of Sciences, 200032 Shanghai, P. R. China
- University of Chinese Academy of Sciences, Shanghai 200032, P. R. China
| | - Hongtao Liu
- National Key Laboratory of Plant Molecular Genetics (NKLPMG), CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology (SIPPE), Chinese Academy of Sciences, 200032 Shanghai, P. R. China
- Corresponding author
| |
Collapse
|
63
|
Hu J, Fang H, Wang J, Yue X, Su M, Mao Z, Zou Q, Jiang H, Guo Z, Yu L, Feng T, Lu L, Peng Z, Zhang Z, Wang N, Chen X. Ultraviolet B-induced MdWRKY72 expression promotes anthocyanin synthesis in apple. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2020; 292:110377. [PMID: 32005382 DOI: 10.1016/j.plantsci.2019.110377] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2019] [Revised: 12/07/2019] [Accepted: 12/10/2019] [Indexed: 05/27/2023]
Abstract
Ultraviolet-B (UV-B) radiation promotes anthocyanin synthesis in many plants. Although several transcription factors promote anthocyanin synthesis in response to UV-B radiation, the underlying mechanism remains unclear. In this study, the MdWRKY72 transcription factor gene was isolated from the 'Taishanzaoxia' apple genome. Quantitative real-time PCR analyses revealed that the genes encoding enzymes and transcription factors involved in the anthocyanin synthesis pathway (MdANS, MdDFR, MdUFGT, and MdMYB1) were more highly expressed in MdWRKY72-overexpressing transgenic calli than in the wild-type 'Orin' apple calli. The results indicated that MdWRKY72 increases anthocyanin synthesis in transgenic calli exposed to UV-B radiation. The results of a gel shift assay and chromatin immunoprecipitation proved that MdWRKY72 promotes MdMYB1 expression indirectly by binding to a W-box element in the MdHY5 promoter and directly by binding to a W-box element in the MdMYB1 promoter. Thus, MdWRKY72 increases anthocyanin synthesis via direct and indirect mechanisms. These findings may be useful for elucidating the molecular mechanism underlying UV-B-induced anthocyanin synthesis mediated by MdWRKY72.
Collapse
Affiliation(s)
- Jiafei Hu
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai'an, Shandong, China; College of Horticulture Sciences, Shandong Agricultural University, Tai'an, Shandong, China
| | - Hongcheng Fang
- College of Forestry, Shandong Agricultural University, Tai'an, Shandong, China; State Forestry and Grassland Administration Key Laboratory of Silviculture in Downstream Areas of the Yellow River, Tai'an, Shandong, China
| | - Jie Wang
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai'an, Shandong, China; College of Horticulture Sciences, Shandong Agricultural University, Tai'an, Shandong, China
| | - Xuanxuan Yue
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai'an, Shandong, China; College of Horticulture Sciences, Shandong Agricultural University, Tai'an, Shandong, China
| | - Mengyu Su
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai'an, Shandong, China; College of Horticulture Sciences, Shandong Agricultural University, Tai'an, Shandong, China
| | - Zuolin Mao
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai'an, Shandong, China; College of Horticulture Sciences, Shandong Agricultural University, Tai'an, Shandong, China
| | - Qi Zou
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai'an, Shandong, China; College of Horticulture Sciences, Shandong Agricultural University, Tai'an, Shandong, China
| | - Huiyan Jiang
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai'an, Shandong, China; College of Horticulture Sciences, Shandong Agricultural University, Tai'an, Shandong, China
| | - Zhangwen Guo
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai'an, Shandong, China; College of Horticulture Sciences, Shandong Agricultural University, Tai'an, Shandong, China
| | - Lei Yu
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai'an, Shandong, China; College of Horticulture Sciences, Shandong Agricultural University, Tai'an, Shandong, China
| | - Tian Feng
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai'an, Shandong, China; College of Horticulture Sciences, Shandong Agricultural University, Tai'an, Shandong, China
| | - Le Lu
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai'an, Shandong, China; College of Horticulture Sciences, Shandong Agricultural University, Tai'an, Shandong, China
| | - Zhenge Peng
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai'an, Shandong, China; College of Horticulture Sciences, Shandong Agricultural University, Tai'an, Shandong, China
| | - Zongying Zhang
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai'an, Shandong, China; College of Horticulture Sciences, Shandong Agricultural University, Tai'an, Shandong, China
| | - Nan Wang
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai'an, Shandong, China; College of Horticulture Sciences, Shandong Agricultural University, Tai'an, Shandong, China.
| | - Xuesen Chen
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai'an, Shandong, China; College of Horticulture Sciences, Shandong Agricultural University, Tai'an, Shandong, China.
| |
Collapse
|
64
|
Tavridou E, Pireyre M, Ulm R. Degradation of the transcription factors PIF4 and PIF5 under UV-B promotes UVR8-mediated inhibition of hypocotyl growth in Arabidopsis. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2020; 101:507-517. [PMID: 31571300 PMCID: PMC7027837 DOI: 10.1111/tpj.14556] [Citation(s) in RCA: 50] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2019] [Revised: 09/17/2019] [Accepted: 09/23/2019] [Indexed: 05/03/2023]
Abstract
Inhibition of hypocotyl growth is a well-established UV-B-induced photomorphogenic response that is mediated by the UV-B photoreceptor UV RESISTANCE LOCUS 8 (UVR8). However, the molecular mechanism by which UVR8 signaling triggers inhibition of hypocotyl growth is poorly understood. The bZIP protein ELONGATED HYPOCOTYL 5 (HY5) functions as the main positive regulatory transcription factor in the UVR8 signaling pathway, with HY5-HOMOLOG (HYH) playing a minor role. However, here we demonstrate that hy5 hyh double mutants maintain significant UVR8-dependent hypocotyl growth inhibition. We identify UVR8-dependent inhibition of the activities of bHLH transcription factors PHYTOCHROME INTERACTING FACTOR 4 (PIF4) and PIF5 as part of the UVR8 signaling pathway, which results in inhibition of hypocotyl growth. The UVR8-mediated repression of several hypocotyl elongation-related genes is independent of HY5 and HYH but largely associated with UVR8-dependent degradation of PIF4 and PIF5, a process that consequently diminishes PIF4/5 target promoter occupancy. Taken together, our data indicate that UVR8-mediated inhibition of hypocotyl growth involves degradation of PIF4 and PIF5. These findings contribute to our mechanistic understanding of UVR8-induced photomorphogenesis and further support the function of PIFs as integrators of different photoreceptor signaling pathways.
Collapse
Affiliation(s)
- Eleni Tavridou
- Department of Botany and Plant BiologySection of BiologyFaculty of ScienceUniversity of GenevaCH‐1211Geneva 4Switzerland
| | - Marie Pireyre
- Department of Botany and Plant BiologySection of BiologyFaculty of ScienceUniversity of GenevaCH‐1211Geneva 4Switzerland
| | - Roman Ulm
- Department of Botany and Plant BiologySection of BiologyFaculty of ScienceUniversity of GenevaCH‐1211Geneva 4Switzerland
- Institute of Genetics and Genomics of Geneva (iGE3)University of GenevaCH-1211Geneva 4Switzerland
| |
Collapse
|
65
|
Garmash EV, Velegzhaninov IO, Ermolina KV, Rybak AV, Malyshev RV. Altered levels of AOX1a expression result in changes in metabolic pathways in Arabidopsis thaliana plants acclimated to low dose rates of ultraviolet B radiation. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2020; 291:110332. [PMID: 31928662 DOI: 10.1016/j.plantsci.2019.110332] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2019] [Revised: 10/28/2019] [Accepted: 11/02/2019] [Indexed: 05/27/2023]
Abstract
UV-B is a damaging component of solar radiation that inevitably reaches the Earth's surface. Plants have developed response mechanisms to adapt to UVB exposure. The alternative oxidase (AOX) catalyzes the ATP-uncoupling cyanide-resistant alternative pathway (AP) in plant mitochondria and is thought to be an important part of the cellular defense network under stress conditions. This study aimed to unravel the poorly understood functional significance of AOX1a induction in Arabidopsis thaliana leaves exposed to ecologically relevant doses of UVB radiation, by comparing wild-type (WT) plants with plants with modified expression of the AOX1a gene, either downregulated by antisense (AS-12) or overexpressed (XX-2). UVB exposure resulted in a phenotypic difference between lines. AOX1a overexpression resulted in the highest induction of AOX1A synthesis and MnSOD activity, and the lowest ROS level without pronounced changes in the phenotype relative to other genotypes. In AS-12 plants, expression of the majority of the genes encoding AOX was detected, other non-phosphorylating pathway components and antioxidant enzymes increased along with anthocyanin accumulation in leaves, and the ROS content was lower than in the WT. In addition to the expected AOX1 protein size (34 kDa), an AOX1 30 kDa band appeared under UVB exposure in all genotypes. However, in AS-12, the alterations in the transcript level and in the abundance of AOX1 protein isoforms induced by UVB could not fully functionally compensate for the lack of AOX1A. This was confirmed by the observed low AP capacity and increased levels of the oxidized form of ascorbate. These results highlight the importance of AOX in plant response to UVB for the control of a balanced metabolism, and indicate that AOX1a plays a key role in the regulation of the stress response.
Collapse
Affiliation(s)
- Elena V Garmash
- Institute of Biology, Komi Scientific Centre, Ural Branch, Russian Academy of Sciences, Syktyvkar, Russia.
| | - Ilya O Velegzhaninov
- Institute of Biology, Komi Scientific Centre, Ural Branch, Russian Academy of Sciences, Syktyvkar, Russia
| | - Ksenia V Ermolina
- Institute of Biology, Komi Scientific Centre, Ural Branch, Russian Academy of Sciences, Syktyvkar, Russia
| | - Anna V Rybak
- Institute of Biology, Komi Scientific Centre, Ural Branch, Russian Academy of Sciences, Syktyvkar, Russia
| | - Ruslan V Malyshev
- Institute of Biology, Komi Scientific Centre, Ural Branch, Russian Academy of Sciences, Syktyvkar, Russia
| |
Collapse
|
66
|
Yang Y, Zhang L, Chen P, Liang T, Li X, Liu H. UV-B photoreceptor UVR8 interacts with MYB73/MYB77 to regulate auxin responses and lateral root development. EMBO J 2020; 39:e101928. [PMID: 31777974 PMCID: PMC6960441 DOI: 10.15252/embj.2019101928] [Citation(s) in RCA: 68] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2019] [Revised: 10/21/2019] [Accepted: 10/24/2019] [Indexed: 12/31/2022] Open
Abstract
The UV-B photoreceptor UVR8 mediates multiple UV-B responses in plants, but the function of UVR8 in regulating root development has not previously been investigated. Here, we show that UV-B light inhibits Arabidopsis lateral root growth in a UVR8-dependent manner. Monomeric UVR8 inhibits auxin responses in a tissue-autonomous manner and thereby regulates lateral root growth. Genome-wide gene expression analysis demonstrated that auxin and UV-B irradiation antagonistically regulate auxin-regulated gene expression. We further show that UVR8 physically interacts with MYB73/MYB77 (MYB DOMAIN PROTEIN 73/77) in a UV-B-dependent manner. UVR8 inhibits lateral root development via regulation of MYB73/MYB77. When activated by UV-B light, UVR8 localizes to the nucleus and inhibits the DNA-binding activities of MYB73/MYB77 and directly represses the transcription of their target auxin-responsive genes. Our results demonstrate that UV-B light and UVR8 are critical for both shoot morphogenesis and root development. The UV-B-dependent interaction of UVR8 and MYB73/MYB77 serves as an important module that integrates light and auxin signaling and represents a new UVR8 signaling mechanism in plants.
Collapse
Affiliation(s)
- Yu Yang
- National Key Laboratory of Plant Molecular Genetics (NKLPMG)CAS Center for Excellence in Molecular Plant SciencesInstitute of Plant Physiology and Ecology (SIPPE)Chinese Academy of SciencesShanghaiChina
- University of Chinese Academy of SciencesShanghaiChina
| | - Libo Zhang
- National Key Laboratory of Plant Molecular Genetics (NKLPMG)CAS Center for Excellence in Molecular Plant SciencesInstitute of Plant Physiology and Ecology (SIPPE)Chinese Academy of SciencesShanghaiChina
| | - Ping Chen
- National Key Laboratory of Plant Molecular Genetics (NKLPMG)CAS Center for Excellence in Molecular Plant SciencesInstitute of Plant Physiology and Ecology (SIPPE)Chinese Academy of SciencesShanghaiChina
- The Joint Center for Infection and Immunity between Guangzhou Institute of PediatricsGuangzhou Women and Children's Medical CenterGuangzhouChina
| | - Tong Liang
- National Key Laboratory of Plant Molecular Genetics (NKLPMG)CAS Center for Excellence in Molecular Plant SciencesInstitute of Plant Physiology and Ecology (SIPPE)Chinese Academy of SciencesShanghaiChina
- University of Chinese Academy of SciencesShanghaiChina
| | - Xuan Li
- National Key Laboratory of Plant Molecular Genetics (NKLPMG)CAS Center for Excellence in Molecular Plant SciencesInstitute of Plant Physiology and Ecology (SIPPE)Chinese Academy of SciencesShanghaiChina
| | - Hongtao Liu
- National Key Laboratory of Plant Molecular Genetics (NKLPMG)CAS Center for Excellence in Molecular Plant SciencesInstitute of Plant Physiology and Ecology (SIPPE)Chinese Academy of SciencesShanghaiChina
| |
Collapse
|
67
|
Žárský V, Sekereš J, Kubátová Z, Pečenková T, Cvrčková F. Three subfamilies of exocyst EXO70 family subunits in land plants: early divergence and ongoing functional specialization. JOURNAL OF EXPERIMENTAL BOTANY 2020; 71:49-62. [PMID: 31647563 DOI: 10.1093/jxb/erz423] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2019] [Accepted: 10/10/2019] [Indexed: 05/27/2023]
Abstract
Localized delivery of plasma membrane and cell wall components is an essential process in all plant cells. The vesicle-tethering complex, the exocyst, an ancient eukaryotic hetero-octameric protein cellular module, assists in targeted delivery of exocytosis vesicles to specific plasma membrane domains. Analyses of Arabidopsis and later other land plant genomes led to the surprising prediction of multiple putative EXO70 exocyst subunit paralogues. All land plant EXO70 exocyst subunits (including those of Bryophytes) form three distinct subfamilies-EXO70.1, EXO70.2, and EXO70.3. Interestingly, while the basal well-conserved EXO70.1 subfamily consists of multiexon genes, the remaining two subfamilies contain mostly single exon genes. Published analyses as well as public transcriptomic and proteomic data clearly indicate that most cell types in plants express and also use several different EXO70 isoforms. Here we sum up recent advances in the characterization of the members of the family of plant EXO70 exocyst subunits and present evidence that members of the EXO70.2 subfamily are often recruited to non-canonical functions in plant membrane trafficking pathways. Engagement of the most evolutionarily dynamic EXO70.2 subfamily of EXO70s in biotic interactions and defence correlates well with massive proliferation and conservation of new protein variants in this subfamily.
Collapse
Affiliation(s)
- Viktor Žárský
- Department of Experimental Plant Biology, Faculty of Science, Charles University, Viničná, Prague, Czech Republic
- Institute of Experimental Botany, v.v.i., Czech Academy of Sciences, Rozvojová, Prague, Czech Republic
| | - Juraj Sekereš
- Institute of Experimental Botany, v.v.i., Czech Academy of Sciences, Rozvojová, Prague, Czech Republic
| | - Zdeňka Kubátová
- Department of Experimental Plant Biology, Faculty of Science, Charles University, Viničná, Prague, Czech Republic
| | - Tamara Pečenková
- Department of Experimental Plant Biology, Faculty of Science, Charles University, Viničná, Prague, Czech Republic
- Institute of Experimental Botany, v.v.i., Czech Academy of Sciences, Rozvojová, Prague, Czech Republic
| | - Fatima Cvrčková
- Department of Experimental Plant Biology, Faculty of Science, Charles University, Viničná, Prague, Czech Republic
| |
Collapse
|
68
|
Liu X, Zhang Q, Yang G, Zhang C, Dong H, Liu Y, Yin R, Lin L. Pivotal roles of Tomato photoreceptor SlUVR8 in seedling development and UV-B stress tolerance. Biochem Biophys Res Commun 2019; 522:177-183. [PMID: 31757427 DOI: 10.1016/j.bbrc.2019.11.073] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2019] [Accepted: 11/12/2019] [Indexed: 11/28/2022]
Abstract
UV RESISTANCE LOCUS 8 (UVR8) is a UV-B photoreceptor that regulates various aspects of plant photomorphogenesis. Physiological functions of UVR8 have been extensively investigated in Arabidopsis. However, functions of Tomato UVR8 (SlUVR8) are largely unknown. To analyze physiological functions of SlUVR8, we generated sluvr8 knock-out mutant lines with CRISPR-CAS9 gene editing approach. At seedling stage, SlUVR8 regulates hypocotyl elongation and anthocyanin accumulation under UV-B. Moreover, SlUVR8 regulates acclimation to low dose UV-B and promotes tolerance to elevated UV-B stress. These results revealed pivotal roles of SlUVR8 in the regulation of Tomato seedling development and UV-B stress tolerance. The manipulation of photoreceptor SlUVR8 may represent a powerful tool to improve Tomato plant performance in nature where high dose UV-B is present.
Collapse
Affiliation(s)
- Xiaorui Liu
- School of Agriculture and Biology, Shanghai JiaoTong University, 800 Dongchuan Road, Minhang District, Shanghai, 200240, People's Republic of China.
| | - Qianwen Zhang
- School of Agriculture and Biology, Shanghai JiaoTong University, 800 Dongchuan Road, Minhang District, Shanghai, 200240, People's Republic of China.
| | - Guoqian Yang
- School of Agriculture and Biology, Shanghai JiaoTong University, 800 Dongchuan Road, Minhang District, Shanghai, 200240, People's Republic of China.
| | - Chunli Zhang
- School of Agriculture and Biology, Shanghai JiaoTong University, 800 Dongchuan Road, Minhang District, Shanghai, 200240, People's Republic of China.
| | - Huaxi Dong
- School of Agriculture and Biology, Shanghai JiaoTong University, 800 Dongchuan Road, Minhang District, Shanghai, 200240, People's Republic of China.
| | - Yang Liu
- School of Agriculture and Biology, Shanghai JiaoTong University, 800 Dongchuan Road, Minhang District, Shanghai, 200240, People's Republic of China.
| | - Ruohe Yin
- School of Agriculture and Biology, Shanghai JiaoTong University, 800 Dongchuan Road, Minhang District, Shanghai, 200240, People's Republic of China; Key Laboratory of Urban Agriculture (South), Ministry of Agriculture, School of Agriculture and Biology, Shanghai JiaoTong University, 800 Dongchuan Road, Minhang District, Shanghai, 200240, People's Republic of China; Joint Center for Single Cell Biology, School of Agriculture and Biology, Shanghai Jiao Tong University, 800 Dongchuan Road, Minhang District, Shanghai, 200240, People's Republic of China.
| | - Li Lin
- School of Agriculture and Biology, Shanghai JiaoTong University, 800 Dongchuan Road, Minhang District, Shanghai, 200240, People's Republic of China.
| |
Collapse
|
69
|
Lyu G, Li D, Li S, Hu H. STO and GA negatively regulate UV-B-induced Arabidopsis root growth inhibition. PLANT SIGNALING & BEHAVIOR 2019; 14:1675471. [PMID: 31595819 PMCID: PMC6866680 DOI: 10.1080/15592324.2019.1675471] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2019] [Revised: 09/25/2019] [Accepted: 09/27/2019] [Indexed: 05/03/2023]
Abstract
Studies on UV-B-induced plant photomorphogenesis mainly focus on Arabidopsis shoots (hypocotyl, leaf, petiole, and stem) but less on roots. In the present research, the low-level UV-B (0.2 W·m-2) induced a decrease in the number of root cells in the meristem zone and an inhibition of the cell length in the maturation zone of roots in Arabidopsis thaliana L.Heynh (Col-0). UV-B-induced root growth inhibition was recovered by the addition of GA3 to culture media. GA3 played an important role in UV-B-induced inhibition of root growth. The cop1-4 mutant with more meristem cell and longer mature cells exhibited longer root length under low-level UV-B. COP1 acted as a positive regulator of root growth under UV-B, through regulation of cell division and elongation. The sto mutant exhibited a shorter root length under UV-B with similar cell length but fewer meristem cells compared with wild type (Col-0). STO only regulated cell division, but cell expansion was not affected. UV-B radiation also inhibited the root growth of uvr8 mutant, and the degree of inhibition was greater than for wild type (Ler). UV-B inhibited the growth of Arabidopsis root, possibly because it changes the GA signal and inhibited cell division and cell elongation, which be related to COP1 and STO genes.
Collapse
Affiliation(s)
- Guizhen Lyu
- Key Laboratory of Ecology and Environmental Science in Guangdong Higher Education, School of Life Science, South China Normal University, Guangzhou, China
| | - Dongbing Li
- Key Laboratory of Ecology and Environmental Science in Guangdong Higher Education, School of Life Science, South China Normal University, Guangzhou, China
| | - Shaoshan Li
- Key Laboratory of Ecology and Environmental Science in Guangdong Higher Education, School of Life Science, South China Normal University, Guangzhou, China
| | - Hongpeng Hu
- Key Laboratory of Ecology and Environmental Science in Guangdong Higher Education, School of Life Science, South China Normal University, Guangzhou, China
| |
Collapse
|
70
|
Ronald J, Davis SJ. Focusing on the nuclear and subnuclear dynamics of light and circadian signalling. PLANT, CELL & ENVIRONMENT 2019; 42:2871-2884. [PMID: 31369151 DOI: 10.1111/pce.13634] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2019] [Revised: 07/27/2019] [Accepted: 07/30/2019] [Indexed: 05/22/2023]
Abstract
Circadian clocks provide organisms the ability to synchronize their internal physiological responses with the external environment. This process, termed entrainment, occurs through the perception of internal and external stimuli. As with other organisms, in plants, the perception of light is a critical for the entrainment and sustainment of circadian rhythms. Red, blue, far-red, and UV-B light are perceived by the oscillator through the activity of photoreceptors. Four classes of photoreceptors signal to the oscillator: phytochromes, cryptochromes, UVR8, and LOV-KELCH domain proteins. In most cases, these photoreceptors localize to the nucleus in response to light and can associate to subnuclear structures to initiate downstream signalling. In this review, we will highlight the recent advances made in understanding the mechanisms facilitating the nuclear and subnuclear localization of photoreceptors and the role these subnuclear bodies have in photoreceptor signalling, including to the oscillator. We will also highlight recent progress that has been made in understanding the regulation of the nuclear and subnuclear localization of components of the plant circadian clock.
Collapse
Affiliation(s)
- James Ronald
- Department of Biology, University of York, YO10 5DD, York, UK
| | - Seth J Davis
- Department of Biology, University of York, YO10 5DD, York, UK
| |
Collapse
|
71
|
Rai N, Neugart S, Yan Y, Wang F, Siipola SM, Lindfors AV, Winkler JB, Albert A, Brosché M, Lehto T, Morales LO, Aphalo PJ. How do cryptochromes and UVR8 interact in natural and simulated sunlight? JOURNAL OF EXPERIMENTAL BOTANY 2019; 70:4975-4990. [PMID: 31100755 PMCID: PMC6760287 DOI: 10.1093/jxb/erz236] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2018] [Accepted: 05/10/2019] [Indexed: 05/20/2023]
Abstract
Cryptochromes (CRYs) and UV RESISTANCE LOCUS 8 (UVR8) photoreceptors perceive UV-A/blue (315-500 nm) and UV-B (280-315 nm) radiation in plants, respectively. While the roles of CRYs and UVR8 have been studied in separate controlled-environment experiments, little is known about the interaction between these photoreceptors. Here, Arabidopsis wild-type Ler, CRYs and UVR8 photoreceptor mutants (uvr8-2, cry1cry2 and cry1cry2uvr8-2), and a flavonoid biosynthesis-defective mutant (tt4) were grown in a sun simulator. Plants were exposed to filtered radiation for 17 d or for 6 h, to study the effects of blue, UV-A, and UV-B radiation. Both CRYs and UVR8 independently enabled growth and survival of plants under solar levels of UV, while their joint absence was lethal under UV-B. CRYs mediated gene expression under blue light. UVR8 mediated gene expression under UV-B radiation, and in the absence of CRYs, also under UV-A. This negative regulation of UVR8-mediated gene expression by CRYs was also observed for UV-B. The accumulation of flavonoids was also consistent with this interaction between CRYs and UVR8. In conclusion, we provide evidence for an antagonistic interaction between CRYs and UVR8 and a role of UVR8 in UV-A perception.
Collapse
Affiliation(s)
- Neha Rai
- Organismal and Evolutionary Biology Research Programme, Viikki Plant Science Center, University of Helsinki, Helsinki, Finland
- Correspondence:
| | - Susanne Neugart
- Research Area of Plant Quality and Food Security, Leibniz Institute of Vegetable and Ornamental Crops e. V., 14979 Grossbeeren, Germany
| | - Yan Yan
- Organismal and Evolutionary Biology Research Programme, Viikki Plant Science Center, University of Helsinki, Helsinki, Finland
| | - Fang Wang
- Organismal and Evolutionary Biology Research Programme, Viikki Plant Science Center, University of Helsinki, Helsinki, Finland
| | - Sari M Siipola
- Organismal and Evolutionary Biology Research Programme, Viikki Plant Science Center, University of Helsinki, Helsinki, Finland
| | | | - Jana Barbro Winkler
- Research Unit Environmental Simulation, Helmholtz Zentrum München, Ingolstädter Landstrasse, Neuherberg, Germany
| | - Andreas Albert
- Research Unit Environmental Simulation, Helmholtz Zentrum München, Ingolstädter Landstrasse, Neuherberg, Germany
| | - Mikael Brosché
- Organismal and Evolutionary Biology Research Programme, Viikki Plant Science Center, University of Helsinki, Helsinki, Finland
| | - Tarja Lehto
- School of Forest Sciences, University of Eastern Finland, Joensuu, Finland
| | - Luis O Morales
- Organismal and Evolutionary Biology Research Programme, Viikki Plant Science Center, University of Helsinki, Helsinki, Finland
- Current address: School of Science & Technology, Örebro Life Science Center, Örebro University, SE-70182 Örebro, Sweden
| | - Pedro J Aphalo
- Organismal and Evolutionary Biology Research Programme, Viikki Plant Science Center, University of Helsinki, Helsinki, Finland
| |
Collapse
|
72
|
Vanhaelewyn L, Viczián A, Prinsen E, Bernula P, Serrano AM, Arana MV, Ballaré CL, Nagy F, Van Der Straeten D, Vandenbussche F. Differential UVR8 Signal across the Stem Controls UV-B-Induced Inflorescence Phototropism. THE PLANT CELL 2019; 31:2070-2088. [PMID: 31289115 PMCID: PMC6751110 DOI: 10.1105/tpc.18.00929] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2018] [Revised: 05/28/2019] [Accepted: 06/25/2019] [Indexed: 05/10/2023]
Abstract
In the course of evolution, plants have developed mechanisms that orient their organs toward the incoming light. At the seedling stage, positive phototropism is mainly regulated by phototropin photoreceptors in blue and UV wavelengths. Contrasting with this, we report that UV RESISTANCE LOCUS8 (UVR8) serves as the predominant photoreceptor of UV-B-induced phototropic responses in Arabidopsis (Arabidopsis thaliana) inflorescence stems. We examined the molecular mechanisms underlying this response and our findings support the Blaauw theory (Blaauw, 1919), suggesting rapid differential growth through unilateral photomorphogenic growth inhibition. UVR8-dependent UV-B light perception occurs mainly in the epidermis and cortex, but deeper tissues such as endodermis can also contribute. Within stems, a spatial difference of UVR8 signal causes a transcript and protein increase of transcription factors ELONGATED HYPOCOTYL5 (HY5) and its homolog HY5 HOMOLOG at the UV-B-exposed side. The irradiated side shows (1) strong activation of flavonoid synthesis genes and flavonoid accumulation; (2) increased gibberellin (GA)2-oxidase expression, diminished GA1 levels, and accumulation of the DELLA protein REPRESSOR OF GA1; and (3) increased expression of the auxin transport regulator PINOID, contributing to diminished auxin signaling. Together, the data suggest a mechanism of phototropin-independent inflorescence phototropism through multiple, locally UVR8-regulated hormone pathways.
Collapse
Affiliation(s)
- Lucas Vanhaelewyn
- Laboratory of Functional Plant Biology, Department of Biology, Faculty of Sciences, Ghent University, KL Ledeganckstraat 35, B-9000 Gent, Belgium
| | - András Viczián
- Institute of Plant Biology, Biological Research Centre, Temesvári körút 62, H-6726 Szeged, Hungary
| | - Els Prinsen
- Department of Biology, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium
| | - Péter Bernula
- Institute of Plant Biology, Biological Research Centre, Temesvári körút 62, H-6726 Szeged, Hungary
- Doctoral School in Biology, Faculty of Science and Informatics, University of Szeged, Szeged, H-6726, Hungary
| | - Alejandro Miguel Serrano
- IADIZA, Av. Ruiz Leal s/n Parque Gral. San Martín, Casilla de Correo 507, Mendoza, 5500, Argentina (CONICET)
| | - Maria Veronica Arana
- Instituto de Investigaciones Forestales y Agropecuarias Bariloche, (CONICET-INTA), Modesta Victoria 4450, San Carlos de Bariloche Rio Negro R8403DVZ, Argentina
| | - Carlos L Ballaré
- IFEVA Universidad de Buenos Aires, Av. San Martín 4453, C1417DSE, Buenos Aires, Argentina
- IIBIO-INTECH, Universidad Nacional de San Martín, B1650HMP, Buenos Aires, Argentina
| | - Ferenc Nagy
- Institute of Plant Biology, Biological Research Centre, Temesvári körút 62, H-6726 Szeged, Hungary
| | - Dominique Van Der Straeten
- Laboratory of Functional Plant Biology, Department of Biology, Faculty of Sciences, Ghent University, KL Ledeganckstraat 35, B-9000 Gent, Belgium
| | - Filip Vandenbussche
- Laboratory of Functional Plant Biology, Department of Biology, Faculty of Sciences, Ghent University, KL Ledeganckstraat 35, B-9000 Gent, Belgium
| |
Collapse
|
73
|
Gabilly ST, Baker CR, Wakao S, Crisanto T, Guan K, Bi K, Guiet E, Guadagno CR, Niyogi KK. Regulation of photoprotection gene expression in Chlamydomonas by a putative E3 ubiquitin ligase complex and a homolog of CONSTANS. Proc Natl Acad Sci U S A 2019; 116:17556-17562. [PMID: 31405963 PMCID: PMC6717296 DOI: 10.1073/pnas.1821689116] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Photosynthetic organisms use nonphotochemical quenching (NPQ) mechanisms to dissipate excess absorbed light energy and protect themselves from photooxidation. In the model green alga Chlamydomonas reinhardtii, the capacity for rapidly reversible NPQ (qE) is induced by high light, blue light, and UV light via increased expression of LHCSR and PSBS genes that are necessary for qE. Here, we used a forward genetics approach to identify SPA1 and CUL4, components of a putative green algal E3 ubiquitin ligase complex, as critical factors in a signaling pathway that controls light-regulated expression of the LHCSR and PSBS genes in C. reinhardtii The spa1 and cul4 mutants accumulate increased levels of LHCSR1 and PSBS proteins in high light, and unlike the wild type, they express LHCSR1 and exhibit qE capacity even when grown in low light. The spa1-1 mutation resulted in constitutively high expression of LHCSR and PSBS RNAs in both low light and high light. The qE and gene expression phenotypes of spa1-1 are blocked by mutation of CrCO, a B-box Zn-finger transcription factor that is a homolog of CONSTANS, which controls flowering time in plants. CONSTANS-like cis-regulatory sequences were identified proximal to the qE genes, consistent with CrCO acting as a direct activator of qE gene expression. We conclude that SPA1 and CUL4 are components of a conserved E3 ubiquitin ligase that acts upstream of CrCO, whose regulatory function is wired differently in C. reinhardtii to control qE capacity via cis-regulatory CrCO-binding sites at key photoprotection genes.
Collapse
Affiliation(s)
- Stéphane T Gabilly
- Department of Plant and Microbial Biology, University of California, Berkeley, CA 94720
| | - Christopher R Baker
- Department of Plant and Microbial Biology, University of California, Berkeley, CA 94720
- Howard Hughes Medical Institute, University of California, Berkeley, CA 94720
| | - Setsuko Wakao
- Department of Plant and Microbial Biology, University of California, Berkeley, CA 94720
- Molecular Biophysics and Integrated Bioimaging Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720
| | - Thien Crisanto
- Department of Plant and Microbial Biology, University of California, Berkeley, CA 94720
| | - Katharine Guan
- Department of Plant and Microbial Biology, University of California, Berkeley, CA 94720
- Howard Hughes Medical Institute, University of California, Berkeley, CA 94720
| | - Ke Bi
- Computational Genomics Resource Laboratory, California Institute for Quantitative Biosciences, University of California, Berkeley, CA 94720
| | - Elodie Guiet
- Department of Plant and Microbial Biology, University of California, Berkeley, CA 94720
| | - Carmela R Guadagno
- Department of Plant and Microbial Biology, University of California, Berkeley, CA 94720
| | - Krishna K Niyogi
- Department of Plant and Microbial Biology, University of California, Berkeley, CA 94720;
- Howard Hughes Medical Institute, University of California, Berkeley, CA 94720
- Molecular Biophysics and Integrated Bioimaging Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720
| |
Collapse
|
74
|
Neugart S, Tobler MA, Barnes PW. Different irradiances of UV and PAR in the same ratios alter the flavonoid profiles of Arabidopsis thaliana wild types and UV-signalling pathway mutants. Photochem Photobiol Sci 2019; 18:1685-1699. [PMID: 31166333 DOI: 10.1039/c8pp00496j] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The UVR8 photoreceptor in Arabidopsis thaliana is specific for ultraviolet-B (UV-B; 280-315 nm) radiation and its activation leads to a number of UV-B acclimation responses, including the accumulation of flavonoids. UVR8 participates in a signaling cascade involving COP1 and HY5 so that the absence of any of these components results in a reduction in the ability of a plant to accumulate flavonoids in response to UV; Cop1 mutants show high dropouts and hy5-ks50 hyh double mutants show very low levels of flavonoids. The predominant phenolics in Arabidopsis thaliana are sinapic acid derivatives as well as non-aclyated quercetin and kaempferol di- and triglycosides containing glucose and rhamnose as glycosylated sugar moieties. How this flavonoid profile in Arabidopsis thaliana is affected by UV radiation, how rapidly these changes occur in changing UV conditions, and which components of the UV-B signalling pathway are involved in rapid UV acclimatization reactions is poorly understood. In the present study, we examined these questions by characterizing the flavonoid profiles of Arabidopsis thaliana signalling mutants and wild types grown under different UV levels of constant UV-B+PAR ratios and then transferring a subset of plants to alternate UV conditions. Results indicate that flavonoid accumulation in Arabidopsis thaliana is triggered by UV and this response is amplified by higher levels of UV but not by all compounds to the same extent. The catechol structure in quercetin seems to be less important than the glycosylation pattern, e.g. having 2 rhamnose moieties in determining responsivity. At low UV+PAR intensities the introduction of UV leads to an initial tendency of increase of flavonoids in the wild types that was detected after 3 days. It took 7 days for these changes to be detected in plants grown under high UV+PAR intensities suggesting a priming of PAR. Thus, the flavonoid profile in Arabidopsis thaliana is altered over time following exposure to UV and PAR, but the functional significance of these changes is currently unclear.
Collapse
Affiliation(s)
- Susanne Neugart
- Department of Biological Sciences, Loyola University New Orleans, 6363 St Charles Avenue, 70118 New Orleans, LA, USA.
| | - Mark A Tobler
- Department of Biological Sciences, Loyola University New Orleans, 6363 St Charles Avenue, 70118 New Orleans, LA, USA.
| | - Paul W Barnes
- Department of Biological Sciences, Loyola University New Orleans, 6363 St Charles Avenue, 70118 New Orleans, LA, USA.
| |
Collapse
|
75
|
O'Hara A, Headland LR, Díaz-Ramos LA, Morales LO, Strid Å, Jenkins GI. Regulation of Arabidopsis gene expression by low fluence rate UV-B independently of UVR8 and stress signaling. Photochem Photobiol Sci 2019; 18:1675-1684. [PMID: 31218318 DOI: 10.1039/c9pp00151d] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
UV-B exposure of plants regulates expression of numerous genes concerned with various responses. Sudden exposure of non-acclimated plants to high fluence rate, short wavelength UV-B induces expression via stress-related signaling pathways that are not specific to the UV-B stimulus, whereas low fluence rates of UV-B can regulate expression via the UV-B photoreceptor UV RESISTANCE LOCUS 8 (UVR8). However, there is little information about whether non-stressful, low fluence rate UV-B treatments can activate gene expression independently of UVR8. Here, transcriptomic analysis of wild-type and uvr8 mutant Arabidopsis exposed to low fluence rate UV-B showed that numerous genes were regulated independently of UVR8. Moreover, nearly all of these genes were distinct to those induced by stress treatments. A small number of genes were expressed at all UV-B fluence rates employed and may be concerned with activation of eustress responses that facilitate acclimation to changing conditions. Expression of the gene encoding the transcription factor ARABIDOPSIS NAC DOMAIN CONTAINING PROTEIN 13 (ANAC13) was studied to characterise a low fluence rate, UVR8-independent response. ANAC13 is induced by as little as 0.1 μmol m-2 s-1 UV-B and its regulation is independent of components of the canonical UVR8 signaling pathway COP1 and HY5/HYH. Furthermore, UV-B induced expression of ANAC13 is independent of the photoreceptors CRY1, CRY2, PHOT1 and PHOT2 and phytochromes A, B, D and E. ANAC13 expression is induced over a range of UV-B wavelengths at low doses, with maximum response at 310 nm. This study provides a basis for further investigation of UVR8 and stress independent, low fluence rate UV-B signaling pathway(s).
Collapse
Affiliation(s)
- Andrew O'Hara
- Örebro Life Science Center, School of Science and Technology, Örebro University, SE-70182 Örebro, Sweden and Institute of Molecular, Cell and Systems Biology, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow G12 8QQ, UK.
| | - Lauren R Headland
- Institute of Molecular, Cell and Systems Biology, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow G12 8QQ, UK.
| | - L Aranzazú Díaz-Ramos
- Institute of Molecular, Cell and Systems Biology, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow G12 8QQ, UK.
| | - Luis O Morales
- Örebro Life Science Center, School of Science and Technology, Örebro University, SE-70182 Örebro, Sweden
| | - Åke Strid
- Örebro Life Science Center, School of Science and Technology, Örebro University, SE-70182 Örebro, Sweden
| | - Gareth I Jenkins
- Institute of Molecular, Cell and Systems Biology, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow G12 8QQ, UK.
| |
Collapse
|
76
|
Lau K, Podolec R, Chappuis R, Ulm R, Hothorn M. Plant photoreceptors and their signaling components compete for COP1 binding via VP peptide motifs. EMBO J 2019; 38:e102140. [PMID: 31304983 PMCID: PMC6745501 DOI: 10.15252/embj.2019102140] [Citation(s) in RCA: 86] [Impact Index Per Article: 17.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2019] [Revised: 05/29/2019] [Accepted: 06/07/2019] [Indexed: 12/31/2022] Open
Abstract
Plants sense different parts of the sun's light spectrum using distinct photoreceptors, which signal through the E3 ubiquitin ligase COP1. Here, we analyze why many COP1‐interacting transcription factors and photoreceptors harbor sequence‐divergent Val‐Pro (VP) motifs that bind COP1 with different binding affinities. Crystal structures of the VP motifs of the UV‐B photoreceptor UVR8 and the transcription factor HY5 in complex with COP1, quantitative binding assays, and reverse genetic experiments together suggest that UVR8 and HY5 compete for COP1. Photoactivation of UVR8 leads to high‐affinity cooperative binding of its VP motif and its photosensing core to COP1, preventing COP1 binding to its substrate HY5. UVR8–VP motif chimeras suggest that UV‐B signaling specificity resides in the UVR8 photoreceptor core. Different COP1–VP peptide motif complexes highlight sequence fingerprints required for COP1 targeting. The blue‐light photoreceptors CRY1 and CRY2 also compete with transcription factors for COP1 binding using similar VP motifs. Thus, our work reveals that different photoreceptors and their signaling components compete for COP1 via a conserved mechanism to control different light signaling cascades.
Collapse
Affiliation(s)
- Kelvin Lau
- Department of Botany and Plant Biology, Section of Biology, Faculty of Sciences, University of Geneva, Geneva, Switzerland
| | - Roman Podolec
- Department of Botany and Plant Biology, Section of Biology, Faculty of Sciences, University of Geneva, Geneva, Switzerland.,Institute of Genetics and Genomics of Geneva (iGE3), University of Geneva, Geneva, Switzerland
| | - Richard Chappuis
- Department of Botany and Plant Biology, Section of Biology, Faculty of Sciences, University of Geneva, Geneva, Switzerland
| | - Roman Ulm
- Department of Botany and Plant Biology, Section of Biology, Faculty of Sciences, University of Geneva, Geneva, Switzerland.,Institute of Genetics and Genomics of Geneva (iGE3), University of Geneva, Geneva, Switzerland
| | - Michael Hothorn
- Department of Botany and Plant Biology, Section of Biology, Faculty of Sciences, University of Geneva, Geneva, Switzerland
| |
Collapse
|
77
|
Vanhaelewyn L, Bernula P, Van Der Straeten D, Vandenbussche F, Viczián A. UVR8-dependent reporters reveal spatial characteristics of signal spreading in plant tissues. Photochem Photobiol Sci 2019; 18:1030-1045. [PMID: 30838366 DOI: 10.1039/c8pp00492g] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The UV Resistance Locus 8 (UVR8) photoreceptor controls UV-B mediated photomorphogenesis in Arabidopsis. The aim of this work is to collect and characterize different molecular reporters of photomorphogenic UV-B responses. Browsing available transcriptome databases, we identified sets of genes responding specifically to this radiation and are controlled by pathways initiated from the UVR8 photoreceptor. We tested the transcriptional changes of several reporters and found that they are regulated differently in different parts of the plant. Our experimental system led us to conclude that the examined genes are not controlled by light piping of UV-B from the shoot to the root or signalling molecules which may travel between different parts of the plant body but by local UVR8 signalling. The initiation of these universal signalling steps can be the induction of Elongated Hypocotyl 5 (HY5) and its homologue, HYH transcription factors. We found that their transcript and protein accumulation strictly depends on UVR8 and happens in a tissue autonomous manner. Whereas HY5 accumulation correlates well with the UVR8 signal across cell layers, the induction of flavonoids depends on both UVR8 signal and a yet to be identified tissue-dependent or developmental determinant.
Collapse
Affiliation(s)
- Lucas Vanhaelewyn
- Laboratory of Functional Plant Biology, Department of Biology, Faculty of Sciences, Ghent University, KL Ledeganckstraat 35, B-9000 Gent, Belgium
| | | | | | | | | |
Collapse
|
78
|
Jin H, Zhu Z. Dis-RUP for COP1 Role-Switch under UV-B Light. TRENDS IN PLANT SCIENCE 2019; 24:569-571. [PMID: 31101402 DOI: 10.1016/j.tplants.2019.04.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2019] [Revised: 04/14/2019] [Accepted: 04/24/2019] [Indexed: 05/24/2023]
Abstract
It is well known that E3 ubiquitin ligase COP1 is a negative regulator of plant photomorphogenesis. However, COP1 acts as a positive regulator under UV-B light. A recent study (Ren et al. Proc. Natl. Acad. Sci. U. S. A. 2019;116:4722-4731) proposes a two-step protein degradation model to explain how COP1 switches its role in response to UV-B light.
Collapse
Affiliation(s)
- Huanhuan Jin
- College of Life Sciences, Nanjing Normal University, Nanjing 210023, China
| | - Ziqiang Zhu
- College of Life Sciences, Nanjing Normal University, Nanjing 210023, China.
| |
Collapse
|
79
|
Fang H, Dong Y, Yue X, Hu J, Jiang S, Xu H, Wang Y, Su M, Zhang J, Zhang Z, Wang N, Chen X. The B-box zinc finger protein MdBBX20 integrates anthocyanin accumulation in response to ultraviolet radiation and low temperature. PLANT, CELL & ENVIRONMENT 2019; 42:2090-2104. [PMID: 30919454 DOI: 10.1111/pce.13552] [Citation(s) in RCA: 97] [Impact Index Per Article: 19.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2018] [Revised: 03/11/2019] [Accepted: 03/17/2019] [Indexed: 05/20/2023]
Abstract
Ultraviolet-B (UV-B) radiation and low temperature promote the accumulation of anthocyanins, which give apple skins their red colour. Although many transcription regulators have been characterized in the UV-B and low-temperature pathways, their interregulation and synergistic effects are not well understood. Here, a B-box transcription factor gene, MdBBX20, was characterized in apple and identified to promote anthocyanin biosynthesis under UV-B conditions in field experiments and when overexpressed in transgenic apple calli. The transcript level of MdBBX20 was significantly induced by UV-B. Specific G-box elements in the promoters of target genes were identified as interaction sites for MdBBX20. Further experimental interrogation of the UV-B signalling pathways showed that MdBBX20 could interact with MdHY5 in vitro and in vivo and that this interaction was required to significantly enhance the promoter activity of MdMYB1. MdBBX20 also responded to low temperature (14°C) with the participation of MdbHLH3, which directly bound a low temperature-response cis elements in the MdBBX20 promoter. These findings demonstrate the molecular mechanism by which MdBBX20 integrates low-temperature- and UV-B-induced anthocyanin accumulation in apple skin.
Collapse
Affiliation(s)
- Hongcheng Fang
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai'an, Shandong, 271018, China
- College of Horticulture Sciences, Shandong Agricultural University, Tai'an, Shandong, 271018, China
| | - Yuhui Dong
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai'an, Shandong, 271018, China
- College of Horticulture Sciences, Shandong Agricultural University, Tai'an, Shandong, 271018, China
| | - Xuanxuan Yue
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai'an, Shandong, 271018, China
- College of Horticulture Sciences, Shandong Agricultural University, Tai'an, Shandong, 271018, China
| | - Jiafei Hu
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai'an, Shandong, 271018, China
- College of Horticulture Sciences, Shandong Agricultural University, Tai'an, Shandong, 271018, China
| | - Shenghui Jiang
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai'an, Shandong, 271018, China
- College of Horticulture Sciences, Shandong Agricultural University, Tai'an, Shandong, 271018, China
| | - Haifeng Xu
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai'an, Shandong, 271018, China
- College of Horticulture Sciences, Shandong Agricultural University, Tai'an, Shandong, 271018, China
| | - Yicheng Wang
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai'an, Shandong, 271018, China
- College of Horticulture Sciences, Shandong Agricultural University, Tai'an, Shandong, 271018, China
| | - Mengyu Su
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai'an, Shandong, 271018, China
- College of Horticulture Sciences, Shandong Agricultural University, Tai'an, Shandong, 271018, China
| | - Jing Zhang
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai'an, Shandong, 271018, China
- College of Horticulture Sciences, Shandong Agricultural University, Tai'an, Shandong, 271018, China
| | - Zongying Zhang
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai'an, Shandong, 271018, China
- College of Horticulture Sciences, Shandong Agricultural University, Tai'an, Shandong, 271018, China
| | - Nan Wang
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai'an, Shandong, 271018, China
- College of Horticulture Sciences, Shandong Agricultural University, Tai'an, Shandong, 271018, China
| | - Xuesen Chen
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai'an, Shandong, 271018, China
- College of Horticulture Sciences, Shandong Agricultural University, Tai'an, Shandong, 271018, China
| |
Collapse
|
80
|
Senapati D, Kushwaha R, Dutta S, Maurya JP, Biswas S, Gangappa SN, Chattopadhyay S. COP1 regulates the stability of CAM7 to promote photomorphogenic growth. PLANT DIRECT 2019; 3:e00144. [PMID: 31245782 PMCID: PMC6593147 DOI: 10.1002/pld3.144] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2018] [Revised: 04/18/2019] [Accepted: 05/07/2019] [Indexed: 05/31/2023]
Abstract
The unique member of the calmodulin gene family, Calmodulin7 (CAM7), plays a crucial role as transcriptional regulator to promote Arabidopsis seedling development. CAM7 regulates the expression of HY5, which is intimately involved in the promotion of photomorphogenic growth and light-regulated gene expression. COP1 ubiquitin ligase suppresses photomorphogenesis by degrading multiple photomorphogenesis promoting factors including HY5 in darkness. Genetic interaction studies, in this report, reveal that CAM7 and COP1 co-ordinately work to promote photomorphogenic growth and light-regulated gene expression at lower intensity of light. CAM7 physically interacts with COP1 in the nucleus. Further, in vivo study suggests that CAM7 and COP1 interaction is light intensity dependent. We have also shown that functional COP1 is required for optimum accumulation of CAM7 at lower fluences of light. Taken together, this study demonstrates the coordinated function of CAM7 and COP1 in Arabidopsis seedling development.
Collapse
Affiliation(s)
| | - Ritu Kushwaha
- Department of BiotechnologyNational Institute of TechnologyDurgapurIndia
| | - Siddhartha Dutta
- Department of BiotechnologyNational Institute of TechnologyDurgapurIndia
| | - Jay Prakash Maurya
- Department of BiotechnologyNational Institute of TechnologyDurgapurIndia
| | - Srabasthi Biswas
- Department of BiotechnologyNational Institute of TechnologyDurgapurIndia
| | | | | |
Collapse
|
81
|
Kondou Y, Miyagi Y, Morito T, Fujihira K, Miyauchi W, Moriyama A, Terasawa T, Ishida S, Iwabuchi K, Kubo H, Nishihama R, Ishizaki K, Kohchi T. Physiological function of photoreceptor UVR8 in UV-B tolerance in the liverwort Marchantia polymorpha. PLANTA 2019; 249:1349-1364. [PMID: 30840176 DOI: 10.1007/s00425-019-03090-w] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2018] [Accepted: 01/04/2019] [Indexed: 05/08/2023]
Abstract
The physiological importance of MpUVR8 in UV-B resistance and translocation in a UV-B-dependent manner from the cytosol into the nucleus is characterized in Marchantia polymorpha. UV RESISTANCE LOCUS 8 (UVR8) is an ultraviolet-B (UV-B) light receptor functioning for UV-B sensing and tolerance in Arabidopsis thaliana and other species. It is unclear whether UVR8 physiologically functions in UV-B-induced defense responses in Marchantia polymorpha, which belongs to the earliest diverging group of embryophyte lineages. Here, we demonstrate that UVR8 has a physiological function in UV-B tolerance and that there is a UVR8-dependent pathway involved. In addition, a UVR8-independent pathway is revealed. We examine the tissue-specific expression pattern of M. polymorpha UVR8 (MpUVR8), showing that it is highly expressed in the apical notch in thalli and gametangiophores, as well as in antheridial and archegonial heads. Furthermore, Mpuvr8KO plant transformants, in which the MpUVR8 locus was disrupted, were produced and analyzed to understand the physiological and molecular function of MpUVR8. Analysis using these plants indicates the important roles of MpUVR8 and MpUVR8-regulated genes, and of MpUVR8-independent pathways in UV-B tolerance. Subcellular localization of Citrine-fused MpUVR8 in M. polymorpha cells was also investigated. It was found to translocate from the cytosol into the nucleus in response to UV-B irradiation. Our findings indicate strong conservation of the physiological function of UVR8 and the molecular mechanisms for UVR8-dependent signal transduction through regulation of gene expression in embryophytes.
Collapse
Affiliation(s)
- Youichi Kondou
- Department of Biosciences, Kanto Gakuin University College of Science and Engineering, Yokohama, 236-8501, Japan.
| | - Yuta Miyagi
- Department of Biosciences, Kanto Gakuin University College of Science and Engineering, Yokohama, 236-8501, Japan
| | - Takeshi Morito
- Department of Biosciences, Kanto Gakuin University College of Science and Engineering, Yokohama, 236-8501, Japan
| | - Kenta Fujihira
- Department of Biosciences, Kanto Gakuin University College of Science and Engineering, Yokohama, 236-8501, Japan
| | - Wataru Miyauchi
- Department of Biosciences, Kanto Gakuin University College of Science and Engineering, Yokohama, 236-8501, Japan
| | - Asami Moriyama
- Department of Biosciences, Kanto Gakuin University College of Science and Engineering, Yokohama, 236-8501, Japan
| | - Takuya Terasawa
- Department of Biosciences, Kanto Gakuin University College of Science and Engineering, Yokohama, 236-8501, Japan
| | - Sakiko Ishida
- Graduate School of Biostudies, Kyoto University, Kyoto, 606-8502, Japan
| | - Kosei Iwabuchi
- Faculty of Science and Engineering, Konan University, Kobe, 658-8501, Japan
| | - Hiroyoshi Kubo
- Department of Biology, Faculty of Science, Shinshu University, Matsumoto, 390-8621, Japan
| | - Ryuichi Nishihama
- Graduate School of Biostudies, Kyoto University, Kyoto, 606-8502, Japan
| | | | - Takayuki Kohchi
- Graduate School of Biostudies, Kyoto University, Kyoto, 606-8502, Japan
| |
Collapse
|
82
|
Fang H, Dong Y, Yue X, Chen X, He N, Hu J, Jiang S, Xu H, Wang Y, Su M, Zhang J, Zhang Z, Wang N, Chen X. MdCOL4 Interaction Mediates Crosstalk Between UV-B and High Temperature to Control Fruit Coloration in Apple. PLANT & CELL PHYSIOLOGY 2019; 60:1055-1066. [PMID: 30715487 DOI: 10.1093/pcp/pcz023] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2018] [Accepted: 01/28/2019] [Indexed: 05/04/2023]
Abstract
In many plants, anthocyanin biosynthesis is affected by environmental conditions. Ultraviolet-B (UV-B) radiation promotes anthocyanin accumulation and fruit coloration in apple skin, whereas high temperature suppresses these processes. In this study, we characterized a B-box transcription factor, MdCOL4, from 'Fuji' apple, and identified its role in anthocyanin biosynthesis by overexpressing its encoding gene in apple red callus. The expression of MdCOL4 was reduced by UV-B, but promoted by high temperature. We explored the regulatory relationship between heat shock transcription factors (HSFs) and MdCOL4, and found that MdHSF3b and MdHSF4a directly bound to the heat shock element cis-element of the MdCOL4 promoter. MdCOL4 interacted with MdHY5 to synergistically inhibit the expression of MdMYB1, and MdCOL4 directly bound to the promoters of MdANS and MdUFGT, which encode genes in the anthocyanin biosynthetic pathway, to suppress their expression. Our findings shed light on the molecular mechanism by which MdCOL4 suppresses anthocyanin accumulation in apple skin under UV-B and high temperature.
Collapse
Affiliation(s)
- Hongcheng Fang
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Daizong Road No.61, Tai'an, Shandong, China
- College of Horticulture Sciences, Shandong Agricultural University, Daizong Road No.61, Tai'an, Shandong, China
| | - Yuhui Dong
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Daizong Road No.61, Tai'an, Shandong, China
- College of Horticulture Sciences, Shandong Agricultural University, Daizong Road No.61, Tai'an, Shandong, China
| | - Xuanxuan Yue
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Daizong Road No.61, Tai'an, Shandong, China
- College of Horticulture Sciences, Shandong Agricultural University, Daizong Road No.61, Tai'an, Shandong, China
| | - Xiaoliu Chen
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Daizong Road No.61, Tai'an, Shandong, China
- College of Horticulture Sciences, Shandong Agricultural University, Daizong Road No.61, Tai'an, Shandong, China
| | - Naibo He
- National Oceangraphic Center, Qingdao, China
| | - Jiafei Hu
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Daizong Road No.61, Tai'an, Shandong, China
- College of Horticulture Sciences, Shandong Agricultural University, Daizong Road No.61, Tai'an, Shandong, China
| | - Shenghui Jiang
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Daizong Road No.61, Tai'an, Shandong, China
- College of Horticulture Sciences, Shandong Agricultural University, Daizong Road No.61, Tai'an, Shandong, China
| | - Haifeng Xu
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Daizong Road No.61, Tai'an, Shandong, China
- College of Horticulture Sciences, Shandong Agricultural University, Daizong Road No.61, Tai'an, Shandong, China
| | - Yicheng Wang
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Daizong Road No.61, Tai'an, Shandong, China
- College of Horticulture Sciences, Shandong Agricultural University, Daizong Road No.61, Tai'an, Shandong, China
| | - Mengyu Su
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Daizong Road No.61, Tai'an, Shandong, China
- College of Horticulture Sciences, Shandong Agricultural University, Daizong Road No.61, Tai'an, Shandong, China
| | - Jing Zhang
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Daizong Road No.61, Tai'an, Shandong, China
- College of Horticulture Sciences, Shandong Agricultural University, Daizong Road No.61, Tai'an, Shandong, China
| | - Zongying Zhang
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Daizong Road No.61, Tai'an, Shandong, China
- College of Horticulture Sciences, Shandong Agricultural University, Daizong Road No.61, Tai'an, Shandong, China
| | - Nan Wang
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Daizong Road No.61, Tai'an, Shandong, China
- College of Horticulture Sciences, Shandong Agricultural University, Daizong Road No.61, Tai'an, Shandong, China
| | - Xuesen Chen
- State Key Laboratory of Crop Biology, Shandong Agricultural University, Daizong Road No.61, Tai'an, Shandong, China
- College of Horticulture Sciences, Shandong Agricultural University, Daizong Road No.61, Tai'an, Shandong, China
| |
Collapse
|
83
|
Yadav A, Bakshi S, Yadukrishnan P, Lingwan M, Dolde U, Wenkel S, Masakapalli SK, Datta S. The B-Box-Containing MicroProtein miP1a/BBX31 Regulates Photomorphogenesis and UV-B Protection. PLANT PHYSIOLOGY 2019; 179:1876-1892. [PMID: 30723178 PMCID: PMC6446756 DOI: 10.1104/pp.18.01258] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2018] [Accepted: 01/28/2019] [Indexed: 05/04/2023]
Abstract
The bZIP transcription factor ELONGATED HYPOCOTYL5 (HY5) represents a major hub in the light-signaling cascade both under visible and UV-B light. The mode of transcriptional regulation of HY5, especially under UV-B light, is not well characterized. B-BOX (BBX) transcription factors regulate HY5 transcription and also posttranscriptionally modulate HY5 to control photomorphogenesis under white light. Here, we identify BBX31 as a key signaling intermediate in visible and UV-B light signal transduction in Arabidopsis (Arabidopsis thaliana). BBX31 expression is induced by UV-B radiation in a fluence-dependent manner. HY5 directly binds to the promoter of BBX31 and regulates its transcript levels. Loss- and gain-of-function mutants of BBX31 indicate that it acts as a negative regulator of photomorphogenesis under white light but is a positive regulator of UV-B signaling. Genetic interaction studies suggest that BBX31 regulates photomorphogenesis independent of HY5 We found no evidence for a direct BBX31-HY5 interaction, and they primarily regulate different sets of genes in white light. Under high doses of UV-B radiation, BBX31 promotes the accumulation of UV-protective flavonoids and phenolic compounds. It enhances tolerance to UV-B radiation by regulating genes involved in photoprotection and DNA repair in a HY5-dependent manner. Under UV-B radiation, overexpression of BBX31 enhances HY5 transcriptional levels in a UV RESISTANCE LOCUS8-dependent manner, suggesting that BBX31 might regulate HY5 transcription.
Collapse
Affiliation(s)
- Arpita Yadav
- Department of Biological Sciences, Indian Institute of Science Education and Research, Bhauri, Bhopal-462066, Madhya Pradesh, India
| | - Souvika Bakshi
- Department of Biological Sciences, Indian Institute of Science Education and Research, Bhauri, Bhopal-462066, Madhya Pradesh, India
| | - Premachandran Yadukrishnan
- Department of Biological Sciences, Indian Institute of Science Education and Research, Bhauri, Bhopal-462066, Madhya Pradesh, India
| | - Maneesh Lingwan
- School of Basic Sciences, Indian Institute of Technology, Mandi-175005, Himachal Pradesh, India
| | - Ulla Dolde
- Copenhagen Plant Science Centre, Department of Plant and Environmental Sciences, University of Copenhagen, 1871 Frederiksberg C, Denmark
| | - Stephan Wenkel
- Copenhagen Plant Science Centre, Department of Plant and Environmental Sciences, University of Copenhagen, 1871 Frederiksberg C, Denmark
| | - Shyam Kumar Masakapalli
- School of Basic Sciences, Indian Institute of Technology, Mandi-175005, Himachal Pradesh, India
| | - Sourav Datta
- Department of Biological Sciences, Indian Institute of Science Education and Research, Bhauri, Bhopal-462066, Madhya Pradesh, India
| |
Collapse
|
84
|
Höll J, Lindner S, Walter H, Joshi D, Poschet G, Pfleger S, Ziegler T, Hell R, Bogs J, Rausch T. Impact of pulsed UV-B stress exposure on plant performance: How recovery periods stimulate secondary metabolism while reducing adaptive growth attenuation. PLANT, CELL & ENVIRONMENT 2019; 42:801-814. [PMID: 30049021 DOI: 10.1111/pce.13409] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2018] [Revised: 07/13/2018] [Accepted: 07/15/2018] [Indexed: 05/20/2023]
Abstract
Upon continuous stress exposure, plants display attenuated metabolic stress responses due to regulatory feedback loops. Here, we have tested the hypothesis that pulsed stress exposure with intervening recovery periods should affect these feedback loops, thereby causing increased accumulation of stress-induced metabolites. The response of Arabidopsis plantlets to continuous UV-B exposure (Cuv ) was compared with that of pulsed UV-B exposure (Puv ). The differential responses to Puv versus Cuv were monitored at the level of gene expression and metabolite accumulation, using wild type (WT) and different mutant lines. In comparison with Cuv , Puv increased sinapyl and flavonol (S + F) content, whereas adaptive growth attenuation was reduced. Furthermore, in a myb4 mutant (AtMYB4, repressor-type R2R3-MYB transcription factor), the S + F content was increased only for Cuv , but not beyond the level for Puv observed in WT. These observations and the ability of AtMYB4 to repress AtMYB12/AtMYB111-mediated activation of target gene promoters (pCHS and pFLS) indicate that the increase of S + F content after Puv observed in WT plants results from reduced feedback inhibition by AtMYB4. The results support the notion that stress-induced metabolic changes not necessarily cause a growth penalty. Furthermore, the observed Puv -induced increase in flavonol accumulation may stimulate reevaluation of commercial plant production practices.
Collapse
Affiliation(s)
- Janine Höll
- Centre for Organismal Studies Heidelberg, Heidelberg University, Heidelberg, Germany
| | - Sonja Lindner
- Centre for Organismal Studies Heidelberg, Heidelberg University, Heidelberg, Germany
| | - Hannah Walter
- Centre for Organismal Studies Heidelberg, Heidelberg University, Heidelberg, Germany
| | - Drishti Joshi
- Centre for Organismal Studies Heidelberg, Heidelberg University, Heidelberg, Germany
| | - Gernot Poschet
- Centre for Organismal Studies Heidelberg, Heidelberg University, Heidelberg, Germany
- Metabolomics Core Technology Platform, Heidelberg University, Heidelberg, Germany
| | - Sina Pfleger
- Centre for Organismal Studies Heidelberg, Heidelberg University, Heidelberg, Germany
| | - Tobias Ziegler
- Centre for Organismal Studies Heidelberg, Heidelberg University, Heidelberg, Germany
| | - Rüdiger Hell
- Centre for Organismal Studies Heidelberg, Heidelberg University, Heidelberg, Germany
- Metabolomics Core Technology Platform, Heidelberg University, Heidelberg, Germany
| | - Jochen Bogs
- Centre for Organismal Studies Heidelberg, Heidelberg University, Heidelberg, Germany
- Dienstleistungszentrum Ländlicher Raum Rheinpfalz, Viticulture and Enology Group, Neustadt, Germany
- Fachhochschule Bingen, Bingen am Rhein, Germany
| | - Thomas Rausch
- Centre for Organismal Studies Heidelberg, Heidelberg University, Heidelberg, Germany
| |
Collapse
|
85
|
Two E3 ligases antagonistically regulate the UV-B response in Arabidopsis. Proc Natl Acad Sci U S A 2019; 116:4722-4731. [PMID: 30787186 DOI: 10.1073/pnas.1816268116] [Citation(s) in RCA: 49] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Photomorphogenesis is a pivotal developmental strategy used by plants to respond to environmental light levels. During emergence from the soil and the establishment of photomorphogenesis, seedlings encounter increasing levels of UV-B irradiation and develop adaptive responses accordingly. However, the molecular mechanisms that orchestrate UV-B signaling cascades remain elusive. Here, we provide biochemical and genetic evidence that the prolonged signaling circuits of UV-B-induced photomorphogenesis involve two sets of E3 ligases and a transcription factor in Arabidopsis thaliana The UV-B-inducible protein RUP1/RUP2 associates with the CUL4-DDB1 scaffold to form an E3 ligase, which represses photomorphogenesis by mediating the degradation of HY5, the hub transcription factor in the light signaling pathway. Conversely, COP1 directly targets RUP1/RUP2 for ubiquitination and degradation, leading to balanced RUP1/RUP2 accumulation, alleviation of the COP1-HY5 interaction, and stabilization of HY5 protein. Therefore, our study reveals that these two E3-substrate modules, CUL4-DDB1-RUP1/RUP2-HY5 and COP1-RUP1/RUP2, constitute the repression and derepression machinery by which plants respond to prolonged UV-B irradiation in photomorphogenic development.
Collapse
|
86
|
Liang T, Yang Y, Liu H. Signal transduction mediated by the plant UV-B photoreceptor UVR8. THE NEW PHYTOLOGIST 2019; 221:1247-1252. [PMID: 30315741 DOI: 10.1111/nph.15469] [Citation(s) in RCA: 63] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2018] [Accepted: 08/23/2018] [Indexed: 05/20/2023]
Abstract
Contents Summary 1247 I. Introduction 1247 II. The UVR8-COP1 pathway 1248 III. The UVR8-WRKY36 pathway 1248 IV. The UVR8-BES1/BIM1 pathway 1249 V. Other pathways 1250 VI. Conclusion and perspectives 1250 Acknowledgements 1251 References 1251 SUMMARY: Ultraviolet-B (UV-B) light is an intrinsic part of sunlight that has significant effects on plant development and acclimation responses. UVR8 (UV Resistance Locus 8) is the long sought-after UV-B photoreceptor that mediates UV-B light perception and signal transduction. UV-B irradiation induces the monomerization and nuclear accumulation of UVR8 in plant cells to activate the UV-B signaling pathway. The photoactivated UVR8 could transduce UV-B signal via multiple mechanisms to regulate transcription and plant growth. Here, we summarize current understanding of UVR8-mediated UV-B signal transduction pathways, including UVR8-COP1 (CONSTITUTIVELY PHOTOMORPHOGENIC 1) and UVR8-WRKY36 (WRKY DNA-BINDING PROTEIN 36), UVR8-BES1 (BRI1-EMS-SUPPRESSOR1) and BIM1 (BES1-INTERACTING MYC-LIKE 1).
Collapse
Affiliation(s)
- Tong Liang
- National Key Laboratory of Plant Molecular Genetics (NKLPMG), CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology (SIPPE), Chinese Academy of Sciences, Shanghai, 200032, China
- University of Chinese Academy of Sciences, Shanghai, 200032, China
| | - Yu Yang
- National Key Laboratory of Plant Molecular Genetics (NKLPMG), CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology (SIPPE), Chinese Academy of Sciences, Shanghai, 200032, China
- University of Chinese Academy of Sciences, Shanghai, 200032, China
| | - Hongtao Liu
- National Key Laboratory of Plant Molecular Genetics (NKLPMG), CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology (SIPPE), Chinese Academy of Sciences, Shanghai, 200032, China
| |
Collapse
|
87
|
Fonseca S, Rubio V. Arabidopsis CRL4 Complexes: Surveying Chromatin States and Gene Expression. FRONTIERS IN PLANT SCIENCE 2019; 10:1095. [PMID: 31608079 PMCID: PMC6761389 DOI: 10.3389/fpls.2019.01095] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2019] [Accepted: 08/09/2019] [Indexed: 05/10/2023]
Abstract
CULLIN4 (CUL4) RING ligase (CRL4) complexes contain a CUL4 scaffold protein, associated to RBX1 and to DDB1 proteins and have traditionally been associated to protein degradation events. Through DDB1, these complexes can associate with numerous DCAF proteins, which directly interact with specific targets promoting their ubiquitination and subsequent degradation by the proteasome. A characteristic feature of the majority of DCAF proteins that associate with DDB1 is the presence of the DWD motif. DWD-containing proteins sum up to 85 in the plant model species Arabidopsis. In the last decade, numerous Arabidopsis DWD proteins have been studied and their molecular functions uncovered. Independently of whether their association with CRL4 has been confirmed or not, DWD proteins are often found as components of additional multimeric protein complexes that play key roles in essential nuclear events. For most of them, the significance of their complex partnership is still unexplored. Here, we summarize recent findings involving both confirmed and putative CRL4-associated DCAF proteins in regulating nuclei architecture remodelling, DNA damage repair, histone post-translational modification, mRNA processing and export, and ribosome biogenesis, that definitely have an impact in gene expression and de novo protein synthesis. We hypothesized that, by maintaining accurate levels of regulatory proteins through targeted degradation and transcriptional control, CRL4 complexes help to surveil nuclear processes essential for plant development and survival.
Collapse
|
88
|
Llabata P, Richter J, Faus I, Słomiňska-Durdasiak K, Zeh LH, Gadea J, Hauser MT. Involvement of the eIF2α Kinase GCN2 in UV-B Responses. FRONTIERS IN PLANT SCIENCE 2019; 10:1492. [PMID: 31850012 PMCID: PMC6892979 DOI: 10.3389/fpls.2019.01492] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2019] [Accepted: 10/28/2019] [Indexed: 05/12/2023]
Abstract
GCN2 (general control nonrepressed 2) is a serine/threonine-protein kinase that regulates translation in response to stressors such as amino acid and purin deprivation, cold shock, wounding, cadmium, and UV-C exposure. Activated GCN2 phosphorylates the α-subunit of the eukaryotic initiation factor 2 (eIF2) leading to a drastic inhibition of protein synthesis and shifting translation to specific mRNAs. To investigate the role of GCN2 in responses to UV-B radiation its activity was analyzed through eIF2α phosphorylation assays in mutants of the specific UV-B and stress signaling pathways of Arabidopsis thaliana. EIF2α phosphorylation was detectable 30 min after UV-B exposure, independent of the UV-B photoreceptor UV RESISTANCE LOCUS8 and its downstream signaling components. GCN2 dependent phosphorylation of eIF2α was also detectable in mutants of the stress related MAP kinases, MPK3 and MPK6 and their negative regulator map kinase phosphatase1 (MKP1). Transcription of downstream components of the UV-B signaling pathway, the Chalcone synthase (CHS) was constitutively higher in gcn2-1 compared to wildtype and further increased upon UV-B while GLUTATHIONE PEROXIDASE7 (GPX7) behaved similarly to wildtype. The UVR8 independent FAD-LINKED OXIDOREDUCTASE (FADox) had a lower basal expression in gcn2-1 which was increased upon UV-B. Since high fluence rates of UV-B induce DNA damage the expression of the RAS ASSOCIATED WITH DIABETES PROTEIN51 (RAD51) was quantified before and after UV-B. While the basal expression was similar to wildtype it was significantly less induced upon UV-B in the gcn2-1 mutant. This expression pattern correlates with the finding that gcn2 mutants develop less cyclobutane pyrimidine dimers after UV-B exposure. Quantification of translation with the puromycination assay revealed that gcn2 mutants have an increased rate of translation which was also higher upon UV-B. Growth of gcn2 mutants to chronic UV-B exposure supports GCN2's role as a negative regulator of UV-B responses. The elevated resistance of gcn2 mutants towards repeated UV-B exposure points to a critical role of GCN2 in the regulation of translation upon UV-B.
Collapse
Affiliation(s)
- Paula Llabata
- Instituto de Biología Molecular y Celular de Plantas (IBMCP), Universidad Politécnica de Valencia (UPV), Consejo Superior de Investigaciones Científicas (CSIC), Ciudad Politécnica de la Innovación (CPI), Valencia, Spain
- Institute of Applied Genetics and Cell Biology, BOKU University of Natural Resources and Life Sciences, Vienna, Austria
- Bellvitge Biomedical Research Institute IDIBELL, Barcelona, Spain
| | - Julia Richter
- Institute of Applied Genetics and Cell Biology, BOKU University of Natural Resources and Life Sciences, Vienna, Austria
| | - Isabel Faus
- Instituto de Biología Molecular y Celular de Plantas (IBMCP), Universidad Politécnica de Valencia (UPV), Consejo Superior de Investigaciones Científicas (CSIC), Ciudad Politécnica de la Innovación (CPI), Valencia, Spain
| | - Karolina Słomiňska-Durdasiak
- Institute of Applied Genetics and Cell Biology, BOKU University of Natural Resources and Life Sciences, Vienna, Austria
- Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Gatersleben, Germany
| | - Lukas Hubert Zeh
- Institute of Applied Genetics and Cell Biology, BOKU University of Natural Resources and Life Sciences, Vienna, Austria
| | - Jose Gadea
- Instituto de Biología Molecular y Celular de Plantas (IBMCP), Universidad Politécnica de Valencia (UPV), Consejo Superior de Investigaciones Científicas (CSIC), Ciudad Politécnica de la Innovación (CPI), Valencia, Spain
| | - Marie-Theres Hauser
- Institute of Applied Genetics and Cell Biology, BOKU University of Natural Resources and Life Sciences, Vienna, Austria
- *Correspondence: Marie-Theres Hauser,
| |
Collapse
|
89
|
Yang B, Song Z, Li C, Jiang J, Zhou Y, Wang R, Wang Q, Ni C, Liang Q, Chen H, Fan LM. RSM1, an Arabidopsis MYB protein, interacts with HY5/HYH to modulate seed germination and seedling development in response to abscisic acid and salinity. PLoS Genet 2018; 14:e1007839. [PMID: 30566447 PMCID: PMC6317822 DOI: 10.1371/journal.pgen.1007839] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2017] [Revised: 01/03/2019] [Accepted: 11/19/2018] [Indexed: 12/03/2022] Open
Abstract
MYB transcription factors are involved in many biological processes, including metabolism, development and responses to biotic and abiotic stresses. RADIALIS-LIKE SANT/MYB 1 (RSM1) belongs to a MYB-related subfamily, and previous transcriptome analysis suggests that RSM1 may play roles in plant development, stress responses and plant hormone signaling. However, the molecular mechanisms of RSM1 action in response to abiotic stresses remain obscure. We show that down-regulation or up-regulation of RSM1 expression alters the sensitivity of seed germination and cotyledon greening to abscisic acid (ABA), NaCl and mannitol in Arabidopsis. The expression of RSM1 is dynamically regulated by ABA and NaCl. Transcription factors ELONGATED HYPOCOTYL 5 (HY5) and HY5 HOMOLOG (HYH) regulate RSM1 expression via binding to the RSM1 promoter. Genetic analyses reveal that RSM1 mediates multiple functions of HY5 in responses of seed germination, post-germination development to ABA and abiotic stresses, and seedling tolerance to salinity. Pull-down and BiFC assays show that RSM1 interacts with HY5/HYH in vitro and in vivo. RSM1 and HY5/HYH may function as a regulatory module in responses to ABA and abiotic stresses. RSM1 binds to the promoter of ABA INSENSITIVE 5 (ABI5), thereby regulating its expression, while RSM1 interaction also stimulates HY5 binding to the ABI5 promoter. However, no evidence was found in the dual-luciferase transient expression assay to support that RSM enhances the activation of ABI5 expression by HY. In summary, HY5/HYH and RSM1 may converge on the ABI5 promoter and independently or somehow dependently regulate ABI5 expression and ABI5-downstream ABA and abiotic stress-responsive genes, thereby improving the adaption of plants to the environment. The phytohormone abscisic acid (ABA) regulates multiple developmental processes in plants, including seed dormancy and germination, growth, and abiotic stress responses. The transcription factor ELONGATED HYPOCOTYL 5 (HY5), a core regulator of light signaling, is involved in ABA and abiotic stress responses by directly regulating the expression of ABA INSENSITIVE 5 (ABI5). In this study, we show that a MYB-related transcription factor, RADIALIS-LIKE SANT/MYB 1 (RSM1), plays important roles in ABA and salinity signaling in Arabidopsis, and we dissect the relationship between RSM1 and HY5. RSM1 interacts with HY5/HYH in vitro and in vivo and they may function as a regulatory module in responses to ABA and abiotic stresses. RSM1 binds to the promoter of ABI5, thereby regulating its expression; moreover, RSM1 interaction stimulates HY5 binding to the ABI5 promoter, but RSM1 was not found to enhance the activation of ABI5 expression by HY5. Genetic analyses reveal that RSM1 mediates the functions of HY5 in responses of seed germination, post-germination developmental responses to ABA and abiotic stresses, and seedling tolerance to salinity. In summary, our work demonstrates that HY5/HYH and RSM1 may bind with the ABI5 promoter to regulate ABI5 expression independently or somehow dependently, thereby controlling the expression of ABI5-downstream target genes in ABA and salinity signaling.
Collapse
Affiliation(s)
- Bencan Yang
- State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences, School of Advanced Agricultural Sciences, Peking University, Beijing, China
| | - Zihao Song
- State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences, School of Advanced Agricultural Sciences, Peking University, Beijing, China
| | - Chaonan Li
- State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences, School of Advanced Agricultural Sciences, Peking University, Beijing, China
| | - Jiahao Jiang
- State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences, School of Advanced Agricultural Sciences, Peking University, Beijing, China
| | - Yangyang Zhou
- State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences, School of Advanced Agricultural Sciences, Peking University, Beijing, China
| | - Ruipu Wang
- State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences, School of Advanced Agricultural Sciences, Peking University, Beijing, China
| | - Qi Wang
- State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences, School of Advanced Agricultural Sciences, Peking University, Beijing, China
| | - Chang Ni
- State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences, School of Advanced Agricultural Sciences, Peking University, Beijing, China
| | - Qing Liang
- State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences, School of Advanced Agricultural Sciences, Peking University, Beijing, China
| | - Haodong Chen
- State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences, School of Advanced Agricultural Sciences, Peking University, Beijing, China
| | - Liu-Min Fan
- State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences, School of Advanced Agricultural Sciences, Peking University, Beijing, China
- * E-mail:
| |
Collapse
|
90
|
Sessa G, Carabelli M, Possenti M, Morelli G, Ruberti I. Multiple Pathways in the Control of the Shade Avoidance Response. PLANTS 2018; 7:plants7040102. [PMID: 30453622 PMCID: PMC6313891 DOI: 10.3390/plants7040102] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/19/2018] [Revised: 11/13/2018] [Accepted: 11/14/2018] [Indexed: 01/09/2023]
Abstract
To detect the presence of neighboring vegetation, shade-avoiding plants have evolved the ability to perceive and integrate multiple signals. Among them, changes in light quality and quantity are central to elicit and regulate the shade avoidance response. Here, we describe recent progresses in the comprehension of the signaling mechanisms underlying the shade avoidance response, focusing on Arabidopsis, because most of our knowledge derives from studies conducted on this model plant. Shade avoidance is an adaptive response that results in phenotypes with a high relative fitness in individual plants growing within dense vegetation. However, it affects the growth, development, and yield of crops, and the design of new strategies aimed at attenuating shade avoidance at defined developmental stages and/or in specific organs in high-density crop plantings is a major challenge for the future. For this reason, in this review, we also report on recent advances in the molecular description of the shade avoidance response in crops, such as maize and tomato, and discuss their similarities and differences with Arabidopsis.
Collapse
Affiliation(s)
- Giovanna Sessa
- Institute of Molecular Biology and Pathology, National Research Council, 00185 Rome, Italy.
| | - Monica Carabelli
- Institute of Molecular Biology and Pathology, National Research Council, 00185 Rome, Italy.
| | - Marco Possenti
- Research Centre for Genomics and Bioinformatics, Council for Agricultural Research and Economics (CREA), 00178 Rome, Italy.
| | - Giorgio Morelli
- Research Centre for Genomics and Bioinformatics, Council for Agricultural Research and Economics (CREA), 00178 Rome, Italy.
| | - Ida Ruberti
- Institute of Molecular Biology and Pathology, National Research Council, 00185 Rome, Italy.
| |
Collapse
|
91
|
Podolec R, Ulm R. Photoreceptor-mediated regulation of the COP1/SPA E3 ubiquitin ligase. CURRENT OPINION IN PLANT BIOLOGY 2018; 45:18-25. [PMID: 29775763 DOI: 10.1016/j.pbi.2018.04.018] [Citation(s) in RCA: 157] [Impact Index Per Article: 26.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2018] [Revised: 04/25/2018] [Accepted: 04/29/2018] [Indexed: 05/19/2023]
Abstract
Plants have evolved specific photoreceptors that capture informational cues from sunlight. The phytochrome, cryptochrome, and UVR8 photoreceptors perceive red/far-red, blue/UV-A, and UV-B light, respectively, and control overlapping photomorphogenic responses important for plant growth and development. A major repressor of such photomorphogenic responses is the E3 ubiquitin ligase formed by CONSTITUTIVELY PHOTOMORPHOGENIC 1 (COP1) and SUPPRESSOR OF PHYA-105 (SPA) proteins, which acts by regulating the stability of photomorphogenesis-promoting transcription factors. The direct interaction of light-activated photoreceptors with the COP1/SPA complex represses its activity via nuclear exclusion of COP1, disruption of the COP1-SPA interaction, and/or SPA protein degradation. This process enables plants to integrate different light signals at the level of the COP1/SPA complex to enact appropriate photomorphogenic responses according to the light environment.
Collapse
Affiliation(s)
- Roman Podolec
- Department of Botany and Plant Biology, Section of Biology, Faculty of Sciences, University of Geneva, CH-1211 Geneva 4, Switzerland; Institute of Genetics and Genomics of Geneva (iGE3), University of Geneva, Geneva, Switzerland
| | - Roman Ulm
- Department of Botany and Plant Biology, Section of Biology, Faculty of Sciences, University of Geneva, CH-1211 Geneva 4, Switzerland; Institute of Genetics and Genomics of Geneva (iGE3), University of Geneva, Geneva, Switzerland.
| |
Collapse
|
92
|
Arongaus AB, Chen S, Pireyre M, Glöckner N, Galvão VC, Albert A, Winkler JB, Fankhauser C, Harter K, Ulm R. Arabidopsis RUP2 represses UVR8-mediated flowering in noninductive photoperiods. Genes Dev 2018; 32:1332-1343. [PMID: 30254107 PMCID: PMC6169840 DOI: 10.1101/gad.318592.118] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2018] [Accepted: 08/17/2018] [Indexed: 12/22/2022]
Abstract
Arongaus et al. show that genetic mutation of REPRESSOR OF UV-B PHOTOMORPHOGENESIS 2 (RUP2) renders the facultative long day plant Arabidopsis thaliana a day-neutral plant (specifically under light conditions that include UV-B radiation) and dependent on the UV RESISTANCE LOCUS 8 (UVR8) UV-B photoreceptor. Plants have evolved complex photoreceptor-controlled mechanisms to sense and respond to seasonal changes in day length. This ability allows plants to optimally time the transition from vegetative growth to flowering. UV-B is an important part intrinsic to sunlight; however, whether and how it affects photoperiodic flowering has remained elusive. Here, we report that, in the presence of UV-B, genetic mutation of REPRESSOR OF UV-B PHOTOMORPHOGENESIS 2 (RUP2) renders the facultative long day plant Arabidopsis thaliana a day-neutral plant and that this phenotype is dependent on the UV RESISTANCE LOCUS 8 (UVR8) UV-B photoreceptor. We provide evidence that the floral repression activity of RUP2 involves direct interaction with CONSTANS, repression of this key activator of flowering, and suppression of FLOWERING LOCUS T transcription. RUP2 therefore functions as an essential repressor of UVR8-mediated induction of flowering under noninductive short day conditions and thus provides a crucial mechanism of photoperiodic flowering control.
Collapse
Affiliation(s)
- Adriana B Arongaus
- Department of Botany and Plant Biology, Section of Biology, Faculty of Sciences, University of Geneva, 1211 Geneva 4, Switzerland
| | - Song Chen
- Department of Botany and Plant Biology, Section of Biology, Faculty of Sciences, University of Geneva, 1211 Geneva 4, Switzerland
| | - Marie Pireyre
- Department of Botany and Plant Biology, Section of Biology, Faculty of Sciences, University of Geneva, 1211 Geneva 4, Switzerland
| | - Nina Glöckner
- Department of Plant Physiology, Center for Plant Molecular Biology (ZMBP), University of Tübingen, 72076 Tübingen, Germany
| | - Vinicius C Galvão
- Center for Integrative Genomics, Faculty of Biology and Medicine, University of Lausanne, 1015 Lausanne, Switzerland
| | - Andreas Albert
- Research Unit Environmental Simulation, Helmholtz Zentrum München, 85764 Neuherberg, Germany
| | - J Barbro Winkler
- Research Unit Environmental Simulation, Helmholtz Zentrum München, 85764 Neuherberg, Germany
| | - Christian Fankhauser
- Center for Integrative Genomics, Faculty of Biology and Medicine, University of Lausanne, 1015 Lausanne, Switzerland
| | - Klaus Harter
- Department of Plant Physiology, Center for Plant Molecular Biology (ZMBP), University of Tübingen, 72076 Tübingen, Germany
| | - Roman Ulm
- Department of Botany and Plant Biology, Section of Biology, Faculty of Sciences, University of Geneva, 1211 Geneva 4, Switzerland.,Institute of Genetics and Genomics of Geneva (iGE3), University of Geneva, 1211 Geneva 4, Switzerland
| |
Collapse
|
93
|
Gruszka D. Crosstalk of the Brassinosteroid Signalosome with Phytohormonal and Stress Signaling Components Maintains a Balance between the Processes of Growth and Stress Tolerance. Int J Mol Sci 2018; 19:ijms19092675. [PMID: 30205610 PMCID: PMC6163518 DOI: 10.3390/ijms19092675] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2018] [Revised: 08/22/2018] [Accepted: 09/07/2018] [Indexed: 12/25/2022] Open
Abstract
Brassinosteroids (BRs) are a class of phytohormones, which regulate various processes during plant life cycle. Intensive studies conducted with genetic, physiological and molecular approaches allowed identification of various components participating in the BR signaling—from the ligand perception, through cytoplasmic signal transduction, up to the BR-dependent gene expression, which is regulated by transcription factors and chromatin modifying enzymes. The identification of new components of the BR signaling is an ongoing process, however an emerging view of the BR signalosome indicates that this process is interconnected at various stages with other metabolic pathways. The signaling crosstalk is mediated by the BR signaling proteins, which function as components of the transmembrane BR receptor, by a cytoplasmic kinase playing a role of the major negative regulator of the BR signaling, and by the transcription factors, which regulate the BR-dependent gene expression and form a complicated regulatory system. This molecular network of interdependencies allows a balance in homeostasis of various phytohormones to be maintained. Moreover, the components of the BR signalosome interact with factors regulating plant reactions to environmental cues and stress conditions. This intricate network of interactions enables a rapid adaptation of plant metabolism to constantly changing environmental conditions.
Collapse
Affiliation(s)
- Damian Gruszka
- Department of Genetics, Faculty of Biology and Environment Protection, University of Silesia, Jagiellonska 28, 40-032 Katowice, Poland.
| |
Collapse
|
94
|
Cagnola JI, Cerdán PD, Pacín M, Andrade A, Rodriguez V, Zurbriggen MD, Legris M, Buchovsky S, Carrillo N, Chory J, Blázquez MA, Alabadi D, Casal JJ. Long-Day Photoperiod Enhances Jasmonic Acid-Related Plant Defense. PLANT PHYSIOLOGY 2018; 178:163-173. [PMID: 30068539 PMCID: PMC6130044 DOI: 10.1104/pp.18.00443] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2018] [Accepted: 07/17/2018] [Indexed: 05/18/2023]
Abstract
Agricultural crops are exposed to a range of daylengths, which act as important environmental cues for the control of developmental processes such as flowering. To explore the additional effects of daylength on plant function, we investigated the transcriptome of Arabidopsis (Arabidopsis thaliana) plants grown under short days (SD) and transferred to long days (LD). Compared with that under SD, the LD transcriptome was enriched in genes involved in jasmonic acid-dependent systemic resistance. Many of these genes exhibited impaired expression induction under LD in the phytochrome A (phyA), cryptochrome 1 (cry1), and cry2 triple photoreceptor mutant. Compared with that under SD, LD enhanced plant resistance to the necrotrophic fungus Botrytis cinerea This response was reduced in the phyA cry1 cry2 triple mutant, in the constitutive photomorphogenic1 (cop1) mutant, in the myc2 mutant, and in mutants impaired in DELLA function. Plants grown under SD had an increased nuclear abundance of COP1 and decreased DELLA abundance, the latter of which was dependent on COP1. We conclude that growth under LD enhances plant defense by reducing COP1 activity and enhancing DELLA abundance and MYC2 expression.
Collapse
Affiliation(s)
- Juan I Cagnola
- Universidad de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Técnicas, Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura, Facultad de Agronomía, C1417DSE Buenos Aires, Argentina
| | - Pablo D Cerdán
- Fundación Instituto Leloir, Instituto de Investigaciones Bioquímicas de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Técnicas, C1405BWE Buenos Aires, Argentina
| | - Manuel Pacín
- Universidad de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Técnicas, Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura, Facultad de Agronomía, C1417DSE Buenos Aires, Argentina
| | - Andrea Andrade
- Laboratorio de Fisiología Vegetal, Departamento de Ciencias Naturales, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto, Rio Cuarto, X5804BY Cordoba, Argentina
| | - Verónica Rodriguez
- Universidad de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Técnicas, Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura, Facultad de Agronomía, C1417DSE Buenos Aires, Argentina
| | - Matias D Zurbriggen
- Institute of Synthetic Biology and CEPLAS, University of Düsseldorf, Duesseldorf D-40225, Germany
| | - Martina Legris
- Fundación Instituto Leloir, Instituto de Investigaciones Bioquímicas de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Técnicas, C1405BWE Buenos Aires, Argentina
| | - Sabrina Buchovsky
- Universidad de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Técnicas, Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura, Facultad de Agronomía, C1417DSE Buenos Aires, Argentina
| | - Néstor Carrillo
- Facultad de Ciencias Bioquímicas y Farmacéuticas, Instituto de Biología Molecular y Celular de Rosario, Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad Nacional de Rosario, S2000 Rosario, Argentina
| | - Joanne Chory
- Howard Hughes Medical Institute, Salk Institute for Biological Studies, La Jolla, California 92037
| | - Miguel A Blázquez
- Instituto de Biología Molecular y Celular de Plantas, Consejo Superior de Investigaciones Científicas-UPV, Ingeniero Fausto Elio s/n, 46022 Valencia, Spain
| | - David Alabadi
- Instituto de Biología Molecular y Celular de Plantas, Consejo Superior de Investigaciones Científicas-UPV, Ingeniero Fausto Elio s/n, 46022 Valencia, Spain
| | - Jorge J Casal
- Universidad de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Técnicas, Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura, Facultad de Agronomía, C1417DSE Buenos Aires, Argentina
- Fundación Instituto Leloir, Instituto de Investigaciones Bioquímicas de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Técnicas, C1405BWE Buenos Aires, Argentina
| |
Collapse
|
95
|
Moriconi V, Binkert M, Costigliolo C, Sellaro R, Ulm R, Casal JJ. Perception of Sunflecks by the UV-B Photoreceptor UV RESISTANCE LOCUS8. PLANT PHYSIOLOGY 2018; 177:75-81. [PMID: 29530938 PMCID: PMC5933136 DOI: 10.1104/pp.18.00048] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2018] [Accepted: 02/26/2018] [Indexed: 05/20/2023]
Abstract
Sunflecks, transient patches of light that penetrate through gaps in the canopy and transiently interrupt shade, are eco-physiologically and agriculturally important sources of energy for carbon gain, but our molecular understanding of how plant organs perceive and respond to sunflecks through photoreceptors remains limited. The UV-B photoreceptor UV RESISTANCE LOCUS8 (UVR8) is a recent addition to the list of plant photosensory receptors, and we have made considerable advances in our understanding of the physiology and molecular mechanisms of action of UVR8 and its signaling pathway. However, the function of UVR8 in the natural environment is poorly understood. Here, we show that the UVR8 dimer/monomer ratio responds quantitatively and reversibly to the intensity of sunflecks that interrupt shade in the field. Sunflecks reduced hypocotyl growth and increased CHALCONE SYNTHASE (CHS) and ELONGATED HYPOCOTYL5 gene expression and CHS protein abundance in wild-type Arabidopsis (Arabidopsis thaliana) seedlings, but the uvr8 mutant was impaired in these responses. UVR8 was also required for normal nuclear dynamics of CONSTITUTIVELY PHOTOMORPHOGENIC1. We propose that UVR8 plays an important role in the plant perception of and response to sunflecks.
Collapse
Affiliation(s)
- Victoria Moriconi
- IFEVA, Universidad de Buenos Aires and CONICET, Facultad de Agronomía, 1417 Buenos Aires, Argentina
| | - Melanie Binkert
- Department of Botany and Plant Biology, Section of Biology, Faculty of Sciences, University of Geneva, 1211 Geneva 4, Switzerland
| | - Cecilia Costigliolo
- Fundación Instituto Leloir, Instituto de Investigaciones Bioquímicas de Buenos Aires-CONICET, 1417 Buenos Aires, Argentina
| | - Romina Sellaro
- IFEVA, Universidad de Buenos Aires and CONICET, Facultad de Agronomía, 1417 Buenos Aires, Argentina
| | - Roman Ulm
- Department of Botany and Plant Biology, Section of Biology, Faculty of Sciences, University of Geneva, 1211 Geneva 4, Switzerland
| | - Jorge J Casal
- IFEVA, Universidad de Buenos Aires and CONICET, Facultad de Agronomía, 1417 Buenos Aires, Argentina
- Fundación Instituto Leloir, Instituto de Investigaciones Bioquímicas de Buenos Aires-CONICET, 1417 Buenos Aires, Argentina
| |
Collapse
|
96
|
Li H, Li Y, Deng H, Sun X, Wang A, Tang X, Gao Y, Zhang N, Wang L, Yang S, Liu Y, Wang S. Tomato UV-B receptor SlUVR8 mediates plant acclimation to UV-B radiation and enhances fruit chloroplast development via regulating SlGLK2. Sci Rep 2018. [PMID: 29666396 DOI: 10.1016/s41598-018-24309-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/22/2023] Open
Abstract
Plants utilize energy from sunlight to perform photosynthesis in chloroplast, an organelle that could be damaged by solar UV radiation. The ultraviolet-B (UV-B) photoreceptor UVR8 is required for UV-B perception and signal transduction. However, little is known about how UVR8 influence chloroplast development under UV-B radiation. Here, we characterized tomato UVR8 gene (SlUVR8) and our results indicated that SlUVR8 facilitate plant acclimation to UV-B stress by orchestrating expression of the UVB-responsive genes (HY5 and CHS) and accumulating UV-absorptive compounds. In addition, we also discovered that SlUVR8 promotes fruit chloroplast development through enhancing accumulation of transcription factor GOLDEN2-LIKE2 (SlGLK2) which determines chloroplast and chlorophyll levels. Furthermore, UV-B radiation could increase expression of SlGLK2 and its target genes in fruits and leaves. SlUVR8 is required for UVB-induced SlGLK2 expression. Together, our work not only identified the conserved functions of SlUVR8 gene in response to UV-B stress, but also uncovered a novel role that SlUVR8 could boost chloroplast development by accumulating SlGLK2 proteins.
Collapse
Affiliation(s)
- Huirong Li
- Ministry of Education Key Laboratory for Bio-resource and Eco-environment, College of Life Science, State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610064, China
- CAS Center for Excellence in Molecular Plant Sciences, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China
| | - Yuxiang Li
- Ministry of Education Key Laboratory for Bio-resource and Eco-environment, College of Life Science, State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610064, China
| | - Heng Deng
- Ministry of Education Key Laboratory for Bio-resource and Eco-environment, College of Life Science, State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610064, China
| | - Xiaochun Sun
- Ministry of Education Key Laboratory for Bio-resource and Eco-environment, College of Life Science, State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610064, China
- Shaanxi University of Chinese Medicine/Shaanxi Collaborative Innovation Center of Chinese Medicinal Resources Industrialization, Shaanxi Sheng, China
| | - Anquan Wang
- School of Biotechnology and Food Engineering, Hefei University of Technology, Hefei, 230009, China
| | - Xiaofeng Tang
- School of Biotechnology and Food Engineering, Hefei University of Technology, Hefei, 230009, China
| | - Yongfeng Gao
- Ministry of Education Key Laboratory for Bio-resource and Eco-environment, College of Life Science, State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610064, China
- School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang, Sichuan, 621010, China
| | - Ning Zhang
- Ministry of Education Key Laboratory for Bio-resource and Eco-environment, College of Life Science, State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610064, China
| | - Lihuan Wang
- Ministry of Education Key Laboratory for Bio-resource and Eco-environment, College of Life Science, State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610064, China
| | - Shuzhang Yang
- Ministry of Education Key Laboratory for Bio-resource and Eco-environment, College of Life Science, State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610064, China
| | - Yongsheng Liu
- Ministry of Education Key Laboratory for Bio-resource and Eco-environment, College of Life Science, State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610064, China.
- School of Biotechnology and Food Engineering, Hefei University of Technology, Hefei, 230009, China.
| | - Songhu Wang
- CAS Center for Excellence in Molecular Plant Sciences, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China.
| |
Collapse
|
97
|
Li H, Li Y, Deng H, Sun X, Wang A, Tang X, Gao Y, Zhang N, Wang L, Yang S, Liu Y, Wang S. Tomato UV-B receptor SlUVR8 mediates plant acclimation to UV-B radiation and enhances fruit chloroplast development via regulating SlGLK2. Sci Rep 2018; 8:6097. [PMID: 29666396 PMCID: PMC5904186 DOI: 10.1038/s41598-018-24309-y] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2017] [Accepted: 03/27/2018] [Indexed: 12/20/2022] Open
Abstract
Plants utilize energy from sunlight to perform photosynthesis in chloroplast, an organelle that could be damaged by solar UV radiation. The ultraviolet-B (UV-B) photoreceptor UVR8 is required for UV-B perception and signal transduction. However, little is known about how UVR8 influence chloroplast development under UV-B radiation. Here, we characterized tomato UVR8 gene (SlUVR8) and our results indicated that SlUVR8 facilitate plant acclimation to UV-B stress by orchestrating expression of the UVB-responsive genes (HY5 and CHS) and accumulating UV-absorptive compounds. In addition, we also discovered that SlUVR8 promotes fruit chloroplast development through enhancing accumulation of transcription factor GOLDEN2-LIKE2 (SlGLK2) which determines chloroplast and chlorophyll levels. Furthermore, UV-B radiation could increase expression of SlGLK2 and its target genes in fruits and leaves. SlUVR8 is required for UVB-induced SlGLK2 expression. Together, our work not only identified the conserved functions of SlUVR8 gene in response to UV-B stress, but also uncovered a novel role that SlUVR8 could boost chloroplast development by accumulating SlGLK2 proteins.
Collapse
Affiliation(s)
- Huirong Li
- Ministry of Education Key Laboratory for Bio-resource and Eco-environment, College of Life Science, State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610064, China.,CAS Center for Excellence in Molecular Plant Sciences, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China
| | - Yuxiang Li
- Ministry of Education Key Laboratory for Bio-resource and Eco-environment, College of Life Science, State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610064, China
| | - Heng Deng
- Ministry of Education Key Laboratory for Bio-resource and Eco-environment, College of Life Science, State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610064, China
| | - Xiaochun Sun
- Ministry of Education Key Laboratory for Bio-resource and Eco-environment, College of Life Science, State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610064, China.,Shaanxi University of Chinese Medicine/Shaanxi Collaborative Innovation Center of Chinese Medicinal Resources Industrialization, Shaanxi Sheng, China
| | - Anquan Wang
- School of Biotechnology and Food Engineering, Hefei University of Technology, Hefei, 230009, China
| | - Xiaofeng Tang
- School of Biotechnology and Food Engineering, Hefei University of Technology, Hefei, 230009, China
| | - Yongfeng Gao
- Ministry of Education Key Laboratory for Bio-resource and Eco-environment, College of Life Science, State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610064, China.,School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang, Sichuan, 621010, China
| | - Ning Zhang
- Ministry of Education Key Laboratory for Bio-resource and Eco-environment, College of Life Science, State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610064, China
| | - Lihuan Wang
- Ministry of Education Key Laboratory for Bio-resource and Eco-environment, College of Life Science, State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610064, China
| | - Shuzhang Yang
- Ministry of Education Key Laboratory for Bio-resource and Eco-environment, College of Life Science, State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610064, China
| | - Yongsheng Liu
- Ministry of Education Key Laboratory for Bio-resource and Eco-environment, College of Life Science, State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610064, China. .,School of Biotechnology and Food Engineering, Hefei University of Technology, Hefei, 230009, China.
| | - Songhu Wang
- CAS Center for Excellence in Molecular Plant Sciences, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China.
| |
Collapse
|
98
|
Sun K, Zhu Z. Illuminating the Nucleus: UVR8 Interacts with More. TRENDS IN PLANT SCIENCE 2018; 23:279-281. [PMID: 29555430 DOI: 10.1016/j.tplants.2018.03.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2018] [Revised: 03/02/2018] [Accepted: 03/05/2018] [Indexed: 06/08/2023]
Abstract
Ultraviolet-B (UV-B) light suppresses hypocotyl elongation. Although UV-B photo-perception mechanisms have been well investigated, the signaling events from UV-B photoreceptor to downstream transcription are largely unknown. Two recent papers illustrate that the UV-B photoreceptor directly inhibits its interacting transcription factors and reveal the missing link between UV-B perception and transcriptional regulation.
Collapse
Affiliation(s)
- Kaiwen Sun
- College of Life Sciences, Nanjing Normal University, Nanjing 210023, China
| | - Ziqiang Zhu
- College of Life Sciences, Nanjing Normal University, Nanjing 210023, China.
| |
Collapse
|
99
|
Demarsy E, Goldschmidt-Clermont M, Ulm R. Coping with 'Dark Sides of the Sun' through Photoreceptor Signaling. TRENDS IN PLANT SCIENCE 2018; 23:260-271. [PMID: 29233601 DOI: 10.1016/j.tplants.2017.11.007] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2017] [Revised: 11/16/2017] [Accepted: 11/17/2017] [Indexed: 05/19/2023]
Abstract
Plants grow in constantly changing environments, including highly variable light intensities. Sunlight provides the energy that drives photosynthesis and is thus of the utmost importance for plant growth and the generation of oxygen, which the majority of life on Earth depends on. However, exposure to either insufficient or excess levels of light can have detrimental effects and cause light stress. Whereas exposure to insufficient light limits photosynthetic activity, resulting in 'energy starvation', exposure to excess light can damage the photosynthetic apparatus. Furthermore, strong sunlight is associated with high levels of potentially damaging UV-B radiation. Different classes of photoreceptors play important roles in coping with the negative aspects of sunlight, for which specific mechanisms are emerging that are reviewed here.
Collapse
Affiliation(s)
- Emilie Demarsy
- Department of Botany and Plant Biology, Section of Biology, Faculty of Sciences, University of Geneva, Geneva, Switzerland
| | - Michel Goldschmidt-Clermont
- Department of Botany and Plant Biology, Section of Biology, Faculty of Sciences, University of Geneva, Geneva, Switzerland; Institute of Genetics and Genomics of Geneva (iGE3), University of Geneva, Geneva, Switzerland.
| | - Roman Ulm
- Department of Botany and Plant Biology, Section of Biology, Faculty of Sciences, University of Geneva, Geneva, Switzerland; Institute of Genetics and Genomics of Geneva (iGE3), University of Geneva, Geneva, Switzerland.
| |
Collapse
|
100
|
Yang Y, Liang T, Zhang L, Shao K, Gu X, Shang R, Shi N, Li X, Zhang P, Liu H. UVR8 interacts with WRKY36 to regulate HY5 transcription and hypocotyl elongation in Arabidopsis. NATURE PLANTS 2018; 4:98-107. [PMID: 29379156 DOI: 10.1038/s41477-017-0099-0] [Citation(s) in RCA: 120] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2017] [Accepted: 12/27/2017] [Indexed: 05/20/2023]
Abstract
UV RESISTANCE LOCUS 8 (UVR8) is an ultraviolet-B (UVB) radiation photoreceptor that mediates light responses in plants. How plant UVR8 acts in response to UVB light is not well understood. Here, we report the identification and characterization of the Arabidopsis WRKY DNA-BINDING PROTEIN 36 (WRKY36) protein. WRKY36 interacts with UVR8 in yeast and Arabidopsis cells and it promotes hypocotyl elongation by inhibiting HY5 transcription. Inhibition of hypocotyl elongation under UVB requires the inhibition of WRKY36. WRKY36 binds to the W-box motif of the HY5 promoter to inhibit its transcription, while nuclear localized UVR8 directly interacts with WRKY36 to inhibit WRKY36-DNA binding both in vitro and in vivo, leading to the release of inhibition of HY5 transcription. These results indicate that WRKY36 is a negative regulator of HY5 and that UVB represses WRKY36 via UVR8 to promote the transcription of HY5 and photomorphogenesis. The UVR8-WRKY36 interaction in the nucleus represents a novel mechanism of early UVR8 signal transduction in Arabidopsis.
Collapse
Affiliation(s)
- Yu Yang
- National Key Laboratory of Plant Molecular Genetics, Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, China
- Shanghai College of Life Science, University of Chinese Academy of Sciences, Shanghai, China
| | - Tong Liang
- National Key Laboratory of Plant Molecular Genetics, Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, China
- Shanghai College of Life Science, University of Chinese Academy of Sciences, Shanghai, China
| | - Libo Zhang
- National Key Laboratory of Plant Molecular Genetics, Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, China
| | - Kai Shao
- National Key Laboratory of Plant Molecular Genetics, Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, China
- Shanghai College of Life Science, University of Chinese Academy of Sciences, Shanghai, China
| | - Xingxing Gu
- National Key Laboratory of Plant Molecular Genetics, Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, China
- Shanghai College of Life Science, University of Chinese Academy of Sciences, Shanghai, China
| | - Ruixin Shang
- National Key Laboratory of Plant Molecular Genetics, Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, China
- Shanghai College of Life Science, University of Chinese Academy of Sciences, Shanghai, China
| | - Nan Shi
- National Key Laboratory of Plant Molecular Genetics, Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, China
| | - Xu Li
- National Key Laboratory of Plant Molecular Genetics, Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, China
| | - Peng Zhang
- National Key Laboratory of Plant Molecular Genetics, Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, China
| | - Hongtao Liu
- National Key Laboratory of Plant Molecular Genetics, Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, China.
| |
Collapse
|