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Neugart S, Steininger V, Fernandes C, Martínez-Abaigar J, Núñez-Olivera E, Schreiner M, Strid Å, Viczián A, Albert A, Badenes-Pérez FR, Castagna A, Dáder B, Fereres A, Gaberscik A, Gulyás Á, Gwynn-Jones D, Nagy F, Jones A, Julkunen-Tiitto R, Konstantinova N, Lakkala K, Llorens L, Martínez-Lüscher J, Nybakken L, Olsen J, Pascual I, Ranieri A, Regier N, Robson M, Rosenqvist E, Santin M, Turunen M, Vandenbussche F, Verdaguer D, Winkler B, Witzel K, Grifoni D, Zipoli G, Hideg É, Jansen MAK, Hauser MT. A synchronized, large-scale field experiment using Arabidopsis thaliana reveals the significance of the UV-B photoreceptor UVR8 under natural conditions. PLANT, CELL & ENVIRONMENT 2024. [PMID: 38881245 DOI: 10.1111/pce.15008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2024] [Revised: 06/03/2024] [Accepted: 06/06/2024] [Indexed: 06/18/2024]
Abstract
This study determines the functional role of the plant ultraviolet-B radiation (UV-B) photoreceptor, UV RESISTANCE LOCUS 8 (UVR8) under natural conditions using a large-scale 'synchronized-genetic-perturbation-field-experiment'. Laboratory experiments have demonstrated a role for UVR8 in UV-B responses but do not reflect the complexity of outdoor conditions where 'genotype × environment' interactions can mask laboratory-observed responses. Arabidopsis thaliana knockout mutant, uvr8-7, and the corresponding Wassilewskija wild type, were sown outdoors on the same date at 21 locations across Europe, ranging from 39°N to 67°N latitude. Growth and climatic data were monitored until bolting. At the onset of bolting, rosette size, dry weight, and phenolics and glucosinolates were quantified. The uvr8-7 mutant developed a larger rosette and contained less kaempferol glycosides, quercetin glycosides and hydroxycinnamic acid derivatives than the wild type across all locations, demonstrating a role for UVR8 under field conditions. UV effects on rosette size and kaempferol glycoside content were UVR8 dependent, but independent of latitude. In contrast, differences between wild type and uvr8-7 in total quercetin glycosides, and the quercetin-to-kaempferol ratio decreased with increasing latitude, that is, a more variable UV response. Thus, the large-scale synchronized approach applied demonstrates a location-dependent functional role of UVR8 under natural conditions.
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Affiliation(s)
- Susanne Neugart
- Division Quality and Sensory of Plant Products, Georg-August-Universität Göttingen, Göttingen, Germany
| | - Viktoria Steininger
- Department of Applied Genetics & Cell Biology, University of Natural Resources & Life Sciences, Vienna, Austria
| | - Catarina Fernandes
- Department of Applied Genetics & Cell Biology, University of Natural Resources & Life Sciences, Vienna, Austria
| | | | | | - Monika Schreiner
- Leibniz Institute of Vegetable and Ornamental Crops, Großbeeren, Germany
| | - Åke Strid
- Department of Natural Sciences, School of Science and Technology, Örebro University, Örebro, Sweden
| | - András Viczián
- Institute of Plant Biology, HUN-REN Biological Research Centre, Szeged, Hungary
| | - Andreas Albert
- Research Unit Environmental Simulation, Helmholtz Zentrum München, Neuherberg, Germany
| | | | - Antonella Castagna
- Department of Agriculture, Food and Environment, University of Pisa, Pisa, Italy
| | - Beatriz Dáder
- Department of Agricultural Production, ETSIAAB, Universidad Politécnica de Madrid, Madrid, Spain
| | - Alberto Fereres
- Institute of Agricultural Sciences, Spanish Council for Scientific Research, Madrid, Spain
| | - Alenka Gaberscik
- Department of Biology, University of Ljubljana, Ljubljana, Slovenia
| | - Ágnes Gulyás
- Department of Climatology and Landscape Ecology, University of Szeged, Szeged, Hungary
| | - Dylan Gwynn-Jones
- Department of Life Sciences, Aberystwyth University, Aberystwyth, UK
| | - Ferenc Nagy
- Institute of Plant Biology, HUN-REN Biological Research Centre, Szeged, Hungary
| | - Alan Jones
- Earthwatch Europe, Oxford, UK
- Scion, New Zealand Forest Research Institute, Rotorua, New Zealand
| | | | - Nataliia Konstantinova
- Department of Applied Genetics & Cell Biology, University of Natural Resources & Life Sciences, Vienna, Austria
| | - Kaisa Lakkala
- Finnish Meteorological Institute - Space and Earth Observation Centre, Sodankylä, Finland
| | - Laura Llorens
- Department of Environmental Sciences, University of Girona, Girona, Spain
| | - Johann Martínez-Lüscher
- Plant Stress Physiology group (Associated Unit to EEAD, CSIC), BIOMA Institute for Biodiversity and the Environment, University of Navarra, Pamplona, Spain
| | - Line Nybakken
- Faculty of Environmental Sciences and Natural Resource Management, Norwegian University of Life Sciences, Ås, Norway
| | - Jorunn Olsen
- Department of Plant Sciences, Norwegian University of Life Sciences, Ås, Norway
| | - Inmaculada Pascual
- Plant Stress Physiology group (Associated Unit to EEAD, CSIC), BIOMA Institute for Biodiversity and the Environment, University of Navarra, Pamplona, Spain
| | - Annamaria Ranieri
- Department of Agriculture, Food and Environment, University of Pisa, Pisa, Italy
| | - Nicole Regier
- Earth and Environment Sciences, Forel Institute, Geneva University, Geneva, Switzerland
| | - Matthew Robson
- Organismal & Evolutionary Biology (OEB), Viikki Plant Science Centre (ViPS), Faculty of Biological & Environmental Sciences, University of Helsinki, Helsinki, Finland
- National School of Forestry, University of Cumbria, Ambleside, UK
| | - Eva Rosenqvist
- Institute of Plant and Environmental Sciences, Crop Science, University of Copenhagen, Tåstrup, Denmark
| | - Marco Santin
- Department of Agriculture, Food and Environment, University of Pisa, Pisa, Italy
| | - Minna Turunen
- Arctic Centre, University of Lapland, Rovaniemi, Finland
| | | | - Dolors Verdaguer
- Department of Environmental Sciences, University of Girona, Girona, Spain
| | - Barbro Winkler
- Research Unit Environmental Simulation, Helmholtz Zentrum München, Neuherberg, Germany
| | - Katja Witzel
- Leibniz Institute of Vegetable and Ornamental Crops, Großbeeren, Germany
| | - Daniele Grifoni
- National Research Council, Institute of Bioeconomy, Sesto Fiorentino, Italy
- Laboratory of Monitoring and Environmental Modelling for the Sustainable Development (LaMMA Consortium), Sesto Fiorentino, Italy
| | - Gaetano Zipoli
- National Research Council Institute for Biometeorology, Sesto Fiorentino, Italy
| | - Éva Hideg
- Department of Plant Biology, Faculty of Sciences, University of Pécs, Pécs, Hungary
| | - Marcel A K Jansen
- Environmental Research Institute, School of Biological, Earth, and Environmental Sciences, University College Cork, Cork, Ireland
| | - Marie-Theres Hauser
- Department of Applied Genetics & Cell Biology, University of Natural Resources & Life Sciences, Vienna, Austria
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Banerjee S, Agarwal P, Choudhury SR, Roy S. MYB4, a member of R2R3-subfamily of MYB transcription factor functions as a repressor of key genes involved in flavonoid biosynthesis and repair of UV-B induced DNA double strand breaks in Arabidopsis. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2024; 211:108698. [PMID: 38714132 DOI: 10.1016/j.plaphy.2024.108698] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2023] [Revised: 03/31/2024] [Accepted: 05/01/2024] [Indexed: 05/09/2024]
Abstract
Plants accumulate flavonoids as part of UV-B acclimation, while a high level of UV-B irradiation induces DNA damage and leads to genome instability. Here, we show that MYB4, a member of the R2R3-subfamily of MYB transcription factor plays important role in regulating plant response to UV-B exposure through the direct repression of the key genes involved in flavonoids biosynthesis and repair of DNA double-strand breaks (DSBs). Our results demonstrate that MYB4 inhibits seed germination and seedling establishment in Arabidopsis following UV-B exposure. Phenotype analyses of atmyb4-1 single mutant line along with uvr8-6/atmyb4-1, cop1-6/atmyb4-1, and hy5-215/atmyb4-1 double mutants indicate that MYB4 functions downstream of UVR8 mediated signaling pathway and negatively affects UV-B acclimation and cotyledon expansion. Our results indicate that MYB4 acts as transcriptional repressor of two key flavonoid biosynthesis genes, including 4CL and FLS, via directly binding to their promoter, thus reducing flavonoid accumulation. On the other hand, AtMYB4 overexpression leads to higher accumulation level of DSBs along with repressed expression of several key DSB repair genes, including AtATM, AtKU70, AtLIG4, AtXRCC4, AtBRCA1, AtSOG1, AtRAD51, and AtRAD54, respectively. Our results further suggest that MYB4 protein represses the expression of two crucial DSB repair genes, AtKU70 and AtXRCC4 through direct binding with their promoters. Together, our results indicate that MYB4 functions as an important coordinator to regulate plant response to UV-B through transcriptional regulation of key genes involved in flavonoids biosynthesis and repair of UV-B induced DNA damage.
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Affiliation(s)
- Samrat Banerjee
- Department of Botany, UGC Center for Advanced Studies, The University of Burdwan, Golapbag Campus, Burdwan, West Bengal, 713104, India
| | - Puja Agarwal
- Constituent College in Purnea University, Purnia, 854301, Bihar, India
| | - Swarup Roy Choudhury
- Department of Biology, Indian Institute of Science Education and Research (IISER) Tirupati, Tirupati, Andhra Pradesh, 517507, India
| | - Sujit Roy
- Department of Botany, UGC Center for Advanced Studies, The University of Burdwan, Golapbag Campus, Burdwan, West Bengal, 713104, India.
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3
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Depaepe T, Vanhaelewyn L, Van Der Straeten D. UV-B responses in the spotlight: Dynamic photoreceptor interplay and cell-type specificity. PLANT, CELL & ENVIRONMENT 2023; 46:3194-3205. [PMID: 37554043 DOI: 10.1111/pce.14680] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2023] [Revised: 07/26/2023] [Accepted: 07/30/2023] [Indexed: 08/10/2023]
Abstract
Plants are constantly exposed to a multitude of external signals, including light. The information contained within the full spectrum of light is perceived by a battery of photoreceptors, each with specific and shared signalling outputs. Recently, it has become clear that UV-B radiation is a vital component of the electromagnetic spectrum, guiding growth and being crucial for plant fitness. However, given the large overlap between UV-B specific signalling pathways and other photoreceptors, understanding how plants can distinguish UV-B specific signals from other light components deserves more scrutiny. With recent evidence, we propose that UV-B signalling and other light signalling pathways occur within distinct tissues and cell-types and that the contribution of each pathway depends on the type of response and the developmental stage of the plant. Elucidating the precise site(s) of action of each molecular player within these signalling pathways is key to fully understand how plants are able to orchestrate coordinated responses to light within the whole plant body. Focusing our efforts on the molecular study of light signal interactions to understand plant growth in natural environments in a cell-type specific manner will be a next step in the field of photobiology.
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Affiliation(s)
- Thomas Depaepe
- Laboratory of Functional Plant Biology, Department of Biology, Ghent University, Ghent, Belgium
| | - Lucas Vanhaelewyn
- Laboratory of Functional Plant Biology, Department of Biology, Ghent University, Ghent, Belgium
- Department of Agricultural Economics, Ghent University, Coupure Links 653 B-9000, Ghent, Belgium
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Wang D, Sun Y, Tu M, Zhang P, Wang X, Wang T, Li J. Response of Zebrina pendula leaves to enhanced UV-B radiation. FUNCTIONAL PLANT BIOLOGY : FPB 2021; 48:851-859. [PMID: 33934745 DOI: 10.1071/fp20274] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2020] [Accepted: 03/10/2021] [Indexed: 06/12/2023]
Abstract
Plants inevitably receive harmful UV-B radiation when exposed to solar energy, so they have developed a variety of strategies to protect against UV-B radiation damage during long-term evolution. In this study, Zebrina pendulaSchnizl. was used to investigate the plant defence against UV-B radiation because of its strong adaptability to sunlight changes, and the colour of its leaves changes significantly under different sunlight intensities. The experiment was carried out to study the changes of Z. pendula leaves under three light conditions: artificial daylight (control check); shading 50%; and artificial daylight + UV-B, aiming to explore the mechanism of defence against UV-B radiation by observing changes in leaf morphological structure, anthocyanin content and distribution. Results showed that the single leaf area increased but leaves became thinner, and the anthocyanin content in the epidermal cells decreased under 50% shading. In contrast, under daylight + UV-B, the single leaf area decreased but thickness increased (mainly due to the increase of the thickness of the upper epidermis and the palisade tissue), the trichomes increased. In addition, the anthocyanin content in the epidermal cells and phenylalanine ammonia-lyase (PAL) activity increased, and the leaf colour became redder, also, the photosynthetic pigment content in mesophyll cells and the biomass per unit volume increased significantly under daylight + UV-B. Thus, when UV-B radiation was enhanced, Z. pendula leaves reduced the exposure to UV-B radiation by reducing the area, and reflect some UV-B radiation by growing trichomes. The UV-B transmittance was effectively reduced by increasing the single leaf thickness and anthocyanin content to block or absorb partial UV-B. Through the above comprehensive defence strategies, Z. pendula effectively avoided the damage of UV-B radiation to mesophyll tissue.
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Affiliation(s)
- Dan Wang
- College of Life Science, Henan Normal University, Xinxiang, Henan 453007, China
| | - Yuchu Sun
- College of Life Science, Henan Normal University, Xinxiang, Henan 453007, China
| | - Mei Tu
- College of Life Science, Henan Normal University, Xinxiang, Henan 453007, China
| | - Peipei Zhang
- College of Life Science, Henan Normal University, Xinxiang, Henan 453007, China
| | - Xiaoqiong Wang
- College of Life Science, Henan Normal University, Xinxiang, Henan 453007, China
| | - Taixia Wang
- College of Life Science, Henan Normal University, Xinxiang, Henan 453007, China; and Engineering Technology Research Center of Nursing and Utilisation of Genuine Chinese Crude Drugs in Henan Province, Xinxiang, Henan 453007, China; and Corresponding author.
| | - Jingyuan Li
- College of Life Science, Henan Normal University, Xinxiang, Henan 453007, China; and Engineering Technology Research Center of Nursing and Utilisation of Genuine Chinese Crude Drugs in Henan Province, Xinxiang, Henan 453007, China; and Corresponding author.
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5
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Rai N, Morales LO, Aphalo PJ. Perception of solar UV radiation by plants: photoreceptors and mechanisms. PLANT PHYSIOLOGY 2021; 186:1382-1396. [PMID: 33826733 PMCID: PMC8260113 DOI: 10.1093/plphys/kiab162] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2020] [Accepted: 03/25/2021] [Indexed: 05/04/2023]
Abstract
About 95% of the ultraviolet (UV) photons reaching the Earth's surface are UV-A (315-400 nm) photons. Plant responses to UV-A radiation have been less frequently studied than those to UV-B (280-315 nm) radiation. Most previous studies on UV-A radiation have used an unrealistic balance between UV-A, UV-B, and photosynthetically active radiation (PAR). Consequently, results from these studies are difficult to interpret from an ecological perspective, leaving an important gap in our understanding of the perception of solar UV radiation by plants. Previously, it was assumed UV-A/blue photoreceptors, cryptochromes and phototropins mediated photomorphogenic responses to UV-A radiation and "UV-B photoreceptor" UV RESISTANCE LOCUS 8 (UVR8) to UV-B radiation. However, our understanding of how UV-A radiation is perceived by plants has recently improved. Experiments using a realistic balance between UV-B, UV-A, and PAR have demonstrated that UVR8 can play a major role in the perception of both UV-B and short-wavelength UV-A (UV-Asw, 315 to ∼350 nm) radiation. These experiments also showed that UVR8 and cryptochromes jointly regulate gene expression through interactions that alter the relative sensitivity to UV-B, UV-A, and blue wavelengths. Negative feedback loops on the action of these photoreceptors can arise from gene expression, signaling crosstalk, and absorption of UV photons by phenolic metabolites. These interactions explain why exposure to blue light modulates photomorphogenic responses to UV-B and UV-Asw radiation. Future studies will need to distinguish between short and long wavelengths of UV-A radiation and to consider UVR8's role as a UV-B/UV-Asw photoreceptor in sunlight.
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Affiliation(s)
- Neha Rai
- Organismal and Evolutionary Biology, Viikki Plant Science Center (ViPS), Faculty of Biological and Environmental Sciences, University of Helsinki, 00014 Helsinki, Finland
- Author for communication: . Present address: Department of Botany and Plant Biology, University of Geneva, Geneva, Switzerland
| | - Luis Orlando Morales
- School of Science and Technology, The Life Science Center-Biology, Örebro University, SE-70182 Örebro, Sweden
| | - Pedro José Aphalo
- Organismal and Evolutionary Biology, Viikki Plant Science Center (ViPS), Faculty of Biological and Environmental Sciences, University of Helsinki, 00014 Helsinki, Finland
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Podolec R, Demarsy E, Ulm R. Perception and Signaling of Ultraviolet-B Radiation in Plants. ANNUAL REVIEW OF PLANT BIOLOGY 2021; 72:793-822. [PMID: 33636992 DOI: 10.1146/annurev-arplant-050718-095946] [Citation(s) in RCA: 54] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Ultraviolet-B (UV-B) radiation is an intrinsic fraction of sunlight that plants perceive through the UVR8 photoreceptor. UVR8 is a homodimer in its ground state that monomerizes upon UV-B photon absorption via distinct tryptophan residues. Monomeric UVR8 competitively binds to the substrate binding site of COP1, thus inhibiting its E3 ubiquitin ligase activity against target proteins, which include transcriptional regulators such as HY5. The UVR8-COP1 interaction also leads to the destabilization of PIF bHLH factor family members. Additionally, UVR8 directly interacts with and inhibits the DNA binding of a different set of transcription factors. Each of these UVR8 signaling mechanisms initiates nuclear gene expression changes leading to UV-B-induced photomorphogenesis and acclimation. The two WD40-repeat proteins RUP1 and RUP2 provide negative feedback regulation and inactivate UVR8 by facilitating redimerization. Here, we review the molecular mechanisms of the UVR8 pathway from UV-B perception and signal transduction to gene expression changes and physiological UV-B responses.
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Affiliation(s)
- Roman Podolec
- Department of Botany and Plant Biology, Section of Biology, Faculty of Sciences, University of Geneva, 1211 Geneva, Switzerland; , ,
- Institute of Genetics and Genomics of Geneva (iGE3), University of Geneva, 1211 Geneva, Switzerland
| | - Emilie Demarsy
- Department of Botany and Plant Biology, Section of Biology, Faculty of Sciences, University of Geneva, 1211 Geneva, Switzerland; , ,
| | - Roman Ulm
- Department of Botany and Plant Biology, Section of Biology, Faculty of Sciences, University of Geneva, 1211 Geneva, Switzerland; , ,
- Institute of Genetics and Genomics of Geneva (iGE3), University of Geneva, 1211 Geneva, Switzerland
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Santin M, Castagna A, Miras-Moreno B, Rocchetti G, Lucini L, Hauser MT, Ranieri A. Beyond the Visible and Below the Peel: How UV-B Radiation Influences the Phenolic Profile in the Pulp of Peach Fruit. A Biochemical and Molecular Study. FRONTIERS IN PLANT SCIENCE 2020; 11:579063. [PMID: 33193522 PMCID: PMC7661749 DOI: 10.3389/fpls.2020.579063] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Accepted: 10/12/2020] [Indexed: 05/13/2023]
Abstract
In the last decades, UV-B radiation has attracted attention due to its potential to increase nutraceutical values of fruit and vegetables, especially by inducing the accumulation of phenolics in a structure-dependent way. However, most current studies have investigated the UV-B-driven changes only in the peel or focusing on individual phenolic classes. Adopting an "-omics" approach, this work aimed to deepen the knowledge about the effects of UV-B radiation on the phenolic profile in the pulp of peach fruit. Based on these considerations, melting flesh yellow peaches (Prunus persica L., cv. Fairtime) were subjected to either a 10- or 60-min UV-B treatment (1.39 and 8.33 kJ m-2, respectively), and sampled at different time points from the exposure. A UHPLC-ESI/QTOF-MS analysis coupled with a phenolics-specific database for the annotation of compounds and a multivariate discriminant analysis revealed a marked effect of UV-B radiation on the phenolic profiles of peach pulp. Particularly, a general, transient increase was observed after 24 h from the irradiation, especially for flavanols, flavonols, and flavones. Such behavior diverges from what was observed in the peel, where an overall increase of phenolics was observed after 36 h from the irradiation. Concerning the flavonols in the pulp, UV-B exposure stimulated a specific accumulation of isorhamnetin and kaempferol derivatives, with variations imposed by the different sugar moiety bound. Anthocyanins, which were the second most abundant flavonoid group after flavonols, displayed a general decrease after 36 h that was not attributable to specific molecules. The UV-B treatments also increased the glycoside/aglycone ratio of flavonols and anthocyanins after 24 h, by increasing the glycoside concentration of both, flavonols and anthocyanins, and decreasing the aglycone concentration of anthocyanins. In support of the biochemical results, targeted gene expression analysis by RT-qPCR revealed an UV-B-induced activation of many genes involved in the flavonoid pathway, e.g., CHS, F3H, F3'H, DFR, as well as some MYB transcription factors and few genes involved in the UV-B perception. Generally, all the flavonoid-related and MYB genes showed a transient UV-B dose-dependent activation after 6 h from the irradiation, similarly to what was observed in the peel.
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Affiliation(s)
- Marco Santin
- Department of Agriculture, Food and Environment, University of Pisa, Pisa, Italy
| | - Antonella Castagna
- Department of Agriculture, Food and Environment, University of Pisa, Pisa, Italy
- Interdepartmental Research Center Nutrafood “Nutraceuticals and Food for Health”, University of Pisa, Pisa, Italy
| | - Begoña Miras-Moreno
- Department for Sustainable Food Process, Università Cattolica del Sacro Cuore, Piacenza, Italy
- Council for Agricultural Research and Economics- Research Centre for Genomics and Bioinformatics, Fiorenzuola d’Arda, Italy
| | - Gabriele Rocchetti
- Department for Sustainable Food Process, Università Cattolica del Sacro Cuore, Piacenza, Italy
| | - Luigi Lucini
- Department for Sustainable Food Process, Università Cattolica del Sacro Cuore, Piacenza, Italy
| | - Marie-Theres Hauser
- Department of Applied Genetics and Cell Biology, University of Natural Resources and Life Sciences, Vienna, Austria
| | - Annamaria Ranieri
- Department of Agriculture, Food and Environment, University of Pisa, Pisa, Italy
- Interdepartmental Research Center Nutrafood “Nutraceuticals and Food for Health”, University of Pisa, Pisa, Italy
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dos S. Nascimento LB, Brunetti C, Agati G, Lo Iacono C, Detti C, Giordani E, Ferrini F, Gori A. Short-Term Pre-Harvest UV-B Supplement Enhances the Polyphenol Content and Antioxidant Capacity of Ocimum basilicum Leaves during Storage. PLANTS (BASEL, SWITZERLAND) 2020; 9:E797. [PMID: 32630593 PMCID: PMC7361986 DOI: 10.3390/plants9060797] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/06/2020] [Revised: 06/21/2020] [Accepted: 06/23/2020] [Indexed: 12/29/2022]
Abstract
Ocimum basilicum (basil) leaves are rich in polyphenols, conferring them a high antioxidant activity. The application of UV-B can be used to maintain the post-harvest nutraceutical quality of basil leaves. We aimed to investigate the effects of pre-harvest UV-B application on polyphenolic and pigment contents, antioxidant capacity, and the visual quality of basil stored leaves. We also evaluated the applicability of the non-invasive Dualex® for monitoring the accumulation of leaf epidermal phenolics (Flav Index). After exposing plants to white light (control) and to supplemental UV-B radiation for 4 d, the leaves were harvested and stored for 7d (TS7). The UV-B leaves showed both a higher phenolic content and antioxidant capacity than the controls at TS7. In addition, the correlations between the Flav Index and phenolic content demonstrated that Dualex® can reliably assess the content of epidermal phenolics, thus confirming its promising utilization as a non-destructive method for monitoring the phytochemical quality of O. basilicum leaves. In conclusion, a pre-harvesting UV-B application may be a tool for enhancing the content of polyphenols and the antioxidant potential of basil stored leaves without detrimental effects on their visual quality. These results are important considering the nutraceutical value of this plant and its wide commercial distribution.
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Affiliation(s)
- Luana Beatriz dos S. Nascimento
- University of Florence, Department of Agriculture, Food, Environment and Forestry (DAGRI), Section Woody Plants, CAP. 50019 Sesto Fiorentino (Florence), Italy; (L.B.d.S.N.); (C.L.I.); (C.D.); (E.G.); (F.F.); (A.G.)
| | - Cecilia Brunetti
- University of Florence, Department of Agriculture, Food, Environment and Forestry (DAGRI), Section Woody Plants, CAP. 50019 Sesto Fiorentino (Florence), Italy; (L.B.d.S.N.); (C.L.I.); (C.D.); (E.G.); (F.F.); (A.G.)
- National Research Council of Italy, Institute for Sustainable Plant Protection (IPSP), CAP. 50019 Sesto Fiorentino (Florence), Italy
| | - Giovanni Agati
- National Research Council of Italy, Institute of Applied Physics (IFAC), CAP. 50019 Sesto Fiorentino (Florence), Italy;
| | - Clara Lo Iacono
- University of Florence, Department of Agriculture, Food, Environment and Forestry (DAGRI), Section Woody Plants, CAP. 50019 Sesto Fiorentino (Florence), Italy; (L.B.d.S.N.); (C.L.I.); (C.D.); (E.G.); (F.F.); (A.G.)
| | - Cassandra Detti
- University of Florence, Department of Agriculture, Food, Environment and Forestry (DAGRI), Section Woody Plants, CAP. 50019 Sesto Fiorentino (Florence), Italy; (L.B.d.S.N.); (C.L.I.); (C.D.); (E.G.); (F.F.); (A.G.)
| | - Edgardo Giordani
- University of Florence, Department of Agriculture, Food, Environment and Forestry (DAGRI), Section Woody Plants, CAP. 50019 Sesto Fiorentino (Florence), Italy; (L.B.d.S.N.); (C.L.I.); (C.D.); (E.G.); (F.F.); (A.G.)
| | - Francesco Ferrini
- University of Florence, Department of Agriculture, Food, Environment and Forestry (DAGRI), Section Woody Plants, CAP. 50019 Sesto Fiorentino (Florence), Italy; (L.B.d.S.N.); (C.L.I.); (C.D.); (E.G.); (F.F.); (A.G.)
- National Research Council of Italy, Institute for Sustainable Plant Protection (IPSP), CAP. 50019 Sesto Fiorentino (Florence), Italy
| | - Antonella Gori
- University of Florence, Department of Agriculture, Food, Environment and Forestry (DAGRI), Section Woody Plants, CAP. 50019 Sesto Fiorentino (Florence), Italy; (L.B.d.S.N.); (C.L.I.); (C.D.); (E.G.); (F.F.); (A.G.)
- National Research Council of Italy, Institute for Sustainable Plant Protection (IPSP), CAP. 50019 Sesto Fiorentino (Florence), Italy
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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.
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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.
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10
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Zhang J, Zhou M, Ge Z, Shen J, Zhou C, Gotor C, Romero LC, Duan X, Liu X, Wu D, Yin X, Xie Y. Abscisic acid-triggered guard cell l-cysteine desulfhydrase function and in situ hydrogen sulfide production contributes to heme oxygenase-modulated stomatal closure. PLANT, CELL & ENVIRONMENT 2020; 43:624-636. [PMID: 31734942 DOI: 10.1111/pce.13685] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2019] [Revised: 11/13/2019] [Accepted: 11/13/2019] [Indexed: 05/25/2023]
Abstract
Recent studies have demonstrated that hydrogen sulfide (H2 S) produced through the activity of l-cysteine desulfhydrase (DES1) is an important gaseous signaling molecule in plants that could participate in abscisic acid (ABA)-induced stomatal closure. However, the coupling of the DES1/H2 S signaling pathways to guard cell movement has not been thoroughly elucidated. The results presented here provide genetic evidence for a physiologically relevant signaling pathway that governs guard cell in situ DES1/H2 S function in stomatal closure. We discovered that ABA-activated DES1 produces H2 S in guard cells. The impaired guard cell ABA phenotype of the des1 mutant can be fully complemented when DES1/H2 S function has been specifically rescued in guard cells and epidermal cells, but not mesophyll cells. This research further characterized DES1/H2 S function in the regulation of LONG HYPOCOTYL1 (HY1, a member of the heme oxygenase family) signaling. ABA-induced DES1 expression and H2 S production are hyper-activated in the hy1 mutant, both of which can be fully abolished by the addition of H2 S scavenger. Impaired guard cell ABA phenotype of des1/hy1 can be restored by H2 S donors. Taken together, this research indicated that guard cell in situ DES1 function is involved in ABA-induced stomatal closure, which also acts as a pivotal hub in regulating HY1 signaling.
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Affiliation(s)
- Jing Zhang
- Laboratory Center of Life Sciences, College of Life Sciences, Nanjing Agricultural University, Nanjing, People's Republic of China
| | - Mingjian Zhou
- Laboratory Center of Life Sciences, College of Life Sciences, Nanjing Agricultural University, Nanjing, People's Republic of China
| | - Zhenglin Ge
- Laboratory Center of Life Sciences, College of Life Sciences, Nanjing Agricultural University, Nanjing, People's Republic of China
| | - Jie Shen
- Laboratory Center of Life Sciences, College of Life Sciences, Nanjing Agricultural University, Nanjing, People's Republic of China
| | - Can Zhou
- Laboratory Center of Life Sciences, College of Life Sciences, Nanjing Agricultural University, Nanjing, People's Republic of China
| | - Cecilia Gotor
- Instituto de Bioquímica Vegetal y Fotosíntesis, Consejo Superior de Investigaciones Científicas and Universidad de Sevilla, Seville, Spain
| | - Luis C Romero
- Instituto de Bioquímica Vegetal y Fotosíntesis, Consejo Superior de Investigaciones Científicas and Universidad de Sevilla, Seville, Spain
| | - Xingliang Duan
- Laboratory Center of Life Sciences, College of Life Sciences, Nanjing Agricultural University, Nanjing, People's Republic of China
| | - Xin Liu
- Key Laboratory of Plant Biotechnology in Universities of Shandong Province, Life Science College, Qingdao Agricultural University, Qingdao, People's Republic of China
| | - Deliang Wu
- Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base, Ministry of Science and Technology, Nanjing, People's Republic of China
- Key Laboratory for Control Technology and Standard for Agro-product Safety and Quality, Ministry of Agriculture and Rural Affairs, Nanjing, People's Republic of China
- Institute of Food Safety and Nutrition, Jiangsu Academy of Agricultural Sciences, Nanjing, People's Republic of China
| | - Xianchao Yin
- Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base, Ministry of Science and Technology, Nanjing, People's Republic of China
- Key Laboratory for Control Technology and Standard for Agro-product Safety and Quality, Ministry of Agriculture and Rural Affairs, Nanjing, People's Republic of China
- Institute of Food Safety and Nutrition, Jiangsu Academy of Agricultural Sciences, Nanjing, People's Republic of China
| | - Yanjie Xie
- Laboratory Center of Life Sciences, College of Life Sciences, Nanjing Agricultural University, Nanjing, People's Republic of China
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11
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Hermanowicz P, Banaś AK, Sztatelman O, Gabryś H, Łabuz J. UV-B Induces Chloroplast Movements in a Phototropin-Dependent Manner. FRONTIERS IN PLANT SCIENCE 2019; 10:1279. [PMID: 31681376 PMCID: PMC6804469 DOI: 10.3389/fpls.2019.01279] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2019] [Accepted: 09/12/2019] [Indexed: 05/07/2023]
Abstract
We examined the impact of UV-B irradiation on chloroplast movements in Arabidopsis leaves. Directional chloroplast movements induced by blue light have been described in multiple plant species. In weak light, chloroplasts accumulate at periclinal cell walls to increase light capture. In strong light, chloroplasts exhibit the avoidance response, as they move towards anticlinal walls to protect the photosynthetic apparatus from light-induced damage. In Arabidopsis, chloroplast movements are triggered by phototropins, phot1 and phot2, which are known as blue/UV-A photoreceptors. We found that irradiation with UV-B of 3.3 µmol·m-2·s-1 induced chloroplast accumulation in wild-type plants. UV-B-triggered accumulation was dependent on the presence of phototropins, especially phot1, but not on UVR8 (the canonical UV-B photoreceptor). Irradiation with strong UV-B of 20 µmol·m-2·s-1 did not induce substantial chloroplast relocations in wild-type leaves. However, in the jac1 mutant, which is defective in chloroplast accumulation, strong UV-B elicited chloroplast avoidance. This indicated that UV-B can also activate signaling to the avoidance response. To assess the possibility of indirect effects of UV-B on chloroplast movements, we examined the impact of UV-B on the actin cytoskeleton, which serves as the motile system for chloroplast movements. While irradiation with UV-B of 3.3 µmol·m-2·s-1 did not affect the actin cytoskeleton, strong UV-B disrupted its structure as shown using an Arabidopsis line expressing Lifeact-green fluorescent protein (GFP). In wild-type plants, pretreatment with strong UV-B attenuated chloroplast responses triggered by subsequent blue light irradiation, further indicating that this UV-B intensity also indirectly affects chloroplast movements. Taken together, our results suggest that the effect of UV-B on chloroplast movement is twofold: it directly induces phototropin-mediated movements; however, at higher intensities, it attenuates the movements in a nonspecific manner.
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Affiliation(s)
- Paweł Hermanowicz
- Laboratory of Photobiology, Małopolska Centre of Biotechnology, Jagiellonian University, Krakow, Poland
- Department of Plant Biotechnology, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Krakow, Poland
| | - Agnieszka Katarzyna Banaś
- Department of Plant Biotechnology, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Krakow, Poland
| | - Olga Sztatelman
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warsaw, Poland
| | - Halina Gabryś
- Department of Plant Biotechnology, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Krakow, Poland
| | - Justyna Łabuz
- Laboratory of Photobiology, Małopolska Centre of Biotechnology, Jagiellonian University, Krakow, Poland
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12
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Robson TM, Aphalo PJ, Banaś AK, Barnes PW, Brelsford CC, Jenkins GI, Kotilainen TK, Łabuz J, Martínez-Abaigar J, Morales LO, Neugart S, Pieristè M, Rai N, Vandenbussche F, Jansen MAK. A perspective on ecologically relevant plant-UV research and its practical application. Photochem Photobiol Sci 2019; 18:970-988. [PMID: 30720036 DOI: 10.1039/c8pp00526e] [Citation(s) in RCA: 51] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Plants perceive ultraviolet-B (UV-B) radiation through the UV-B photoreceptor UV RESISTANCE LOCUS 8 (UVR8), and initiate regulatory responses via associated signalling networks, gene expression and metabolic pathways. Various regulatory adaptations to UV-B radiation enable plants to harvest information about fluctuations in UV-B irradiance and spectral composition in natural environments, and to defend themselves against UV-B exposure. Given that UVR8 is present across plant organs and tissues, knowledge of the systemic signalling involved in its activation and function throughout the plant is important for understanding the context of specific responses. Fine-scale understanding of both UV-B irradiance and perception within tissues and cells requires improved application of knowledge about UV-attenuation in leaves and canopies, warranting greater consideration when designing experiments. In this context, reciprocal crosstalk among photoreceptor-induced pathways also needs to be considered, as this appears to produce particularly complex patterns of physiological and morphological response. Through crosstalk, plant responses to UV-B radiation go beyond simply UV-protection or amelioration of damage, but may give cross-protection over a suite of environmental stressors. Overall, there is emerging knowledge showing how information captured by UVR8 is used to regulate molecular and physiological processes, although understanding of upscaling to higher levels of organisation, i.e. organisms, canopies and communities remains poor. Achieving this will require further studies using model plant species beyond Arabidopsis, and that represent a broad range of functional types. More attention should also be given to plants in natural environments in all their complexity, as such studies are needed to acquire an improved understanding of the impact of climate change in the context of plant-UV responses. Furthermore, broadening the scope of experiments into the regulation of plant-UV responses will facilitate the application of UV radiation in commercial plant production. By considering the progress made in plant-UV research, this perspective highlights prescient topics in plant-UV photobiology where future research efforts can profitably be focussed. This perspective also emphasises burgeoning interdisciplinary links that will assist in understanding of UV-B effects across organisational scales and gaps in knowledge that need to be filled so as to achieve an integrated vision of plant responses to UV-radiation.
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Affiliation(s)
- T Matthew Robson
- Organismal and Evolutionary Biology, Viikki Plant Science Centre (ViPS), University of Helsinki, Finland.
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13
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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.
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Affiliation(s)
- Lucas Vanhaelewyn
- Laboratory of Functional Plant Biology, Department of Biology, Faculty of Sciences, Ghent University, KL Ledeganckstraat 35, B-9000 Gent, Belgium
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14
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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.
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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
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15
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Bornman JF, Barnes PW, Robson TM, Robinson SA, Jansen MAK, Ballaré CL, Flint SD. Linkages between stratospheric ozone, UV radiation and climate change and their implications for terrestrial ecosystems. Photochem Photobiol Sci 2019; 18:681-716. [DOI: 10.1039/c8pp90061b] [Citation(s) in RCA: 90] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Linkages between stratospheric ozone, UV radiation and climate change: terrestrial ecosystems.
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Affiliation(s)
- Janet F. Bornman
- College of Science
- Health
- Engineering and Education
- Murdoch University
- Perth
| | - Paul W. Barnes
- Department of Biological Sciences and Environment Program
- Loyola University
- USA
| | - T. Matthew Robson
- Research Programme in Organismal and Evolutionary Biology
- Viikki Plant Science Centre
- University of Helsinki
- Finland
| | - Sharon A. Robinson
- Centre for Sustainable Ecosystem Solutions
- School of Earth
- Atmosphere and Life Sciences and Global Challenges Program
- University of Wollongong
- Wollongong
| | - Marcel A. K. Jansen
- Plant Ecophysiology Group
- School of Biological
- Earth and Environmental Sciences
- UCC
- Cork
| | - Carlos L. Ballaré
- University of Buenos Aires
- Faculty of Agronomy and IFEVA-CONICET, and IIB
- National University of San Martin
- Buenos Aires
- Argentina
| | - Stephan D. Flint
- Department of Forest
- Rangeland and Fire Sciences
- University of Idaho
- Moscow
- USA
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16
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Henry-Kirk RA, Plunkett B, Hall M, McGhie T, Allan AC, Wargent JJ, Espley RV. Solar UV light regulates flavonoid metabolism in apple (Malus x domestica). PLANT, CELL & ENVIRONMENT 2018; 41:675-688. [PMID: 29315644 DOI: 10.1111/pce.13125] [Citation(s) in RCA: 109] [Impact Index Per Article: 18.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2017] [Revised: 12/04/2017] [Accepted: 12/07/2017] [Indexed: 05/21/2023]
Abstract
Ultraviolet-B light (UV-B) is one environmental signal perceived by plants that affects the flavonoid pathway and influences the levels of anthocyanins, flavonols, and proanthocyanidins. To understand the mechanisms underlying UV exposure, apple trees were grown under spectral filters that altered transmission of solar UV light. Fruit analysis showed that UV induced changes in physiology, metabolism, and gene expression levels during development over a season. These changes were sustained after storage. Under low UV, ripening was delayed, fruit size decreased, and anthocyanin and flavonols were reduced. Expression analysis showed changes in response to UV light levels for genes in the regulation and biosynthesis of anthocyanin and flavonols. Transcription of flavonol synthase (FLS), ELONGATED HYPOCOTYL 5 (HY5), MYB10, and MYB22 were down-regulated throughout fruit development under reduced UV. Functional testing showed that the FLS promoter was activated by HY5, and this response was enhanced by the presence of MYB22. The MYB22 promoter can also be activated by the anthocyanin regulator, MYB10. As ambient levels of UV light vary around the globe, this study has implications for future crop production, the quality of which can be determined by the response to UV.
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Affiliation(s)
- Rebecca A Henry-Kirk
- The New Zealand Institute for Plant and Food Research Limited (PFR), Private Bag, 92169, Auckland, New Zealand
| | - Blue Plunkett
- The New Zealand Institute for Plant and Food Research Limited (PFR), Private Bag, 92169, Auckland, New Zealand
| | - Miriam Hall
- The New Zealand Institute for Plant and Food Research Limited (PFR), Private Bag, 92169, Auckland, New Zealand
| | - Tony McGhie
- Plant and Food Research, Palmerston North Research Centre, Palmerston North, 4442, New Zealand
| | - Andrew C Allan
- The New Zealand Institute for Plant and Food Research Limited (PFR), Private Bag, 92169, Auckland, New Zealand
- School of Biological Sciences, University of Auckland, Private Bag, 92019, Auckland, New Zealand
| | - Jason J Wargent
- Institute of Agriculture and Environment, Massey University, Private Bag 11222, Palmerston North, 4442, New Zealand
| | - Richard V Espley
- The New Zealand Institute for Plant and Food Research Limited (PFR), Private Bag, 92169, Auckland, New Zealand
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17
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Dotto M, Casati P. Developmental reprogramming by UV-B radiation in plants. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2017; 264:96-101. [PMID: 28969807 DOI: 10.1016/j.plantsci.2017.09.006] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2017] [Revised: 07/27/2017] [Accepted: 09/01/2017] [Indexed: 05/08/2023]
Abstract
Plants are extremely plastic organisms with the ability to adapt and respond to the changing environmental conditions surrounding them. Sunlight is one of the main resources for plants, both as a primary energy source for photosynthesis and as a stimulus that regulates different aspects of their growth and development. UV-B comprises wavelengths that correspond to a high energy region of the solar spectrum capable of reaching the biosphere, influencing plant growth. It is currently believed that plants are able to acclimate when growing under the influence of this radiation and perceive it as a signal, without stress signs. Nonetheless, many UV-B induced changes are elicited after DNA damage occurs as a consequence of exposure. In this review we focus on the influence of UV-B on leaf, flower and root development and emphasize the limited understanding of the molecular mechanisms for most of this developmental processes affected by UV-B documented over the years of research in this area.
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Affiliation(s)
- Marcela Dotto
- Facultad de Ciencias Agrarias, Universidad Nacional del Litoral, 3080, Esperanza, Santa Fe, Argentina.
| | - Paula Casati
- Centro de Estudios Fotosintéticos y Bioquímicos, Universidad Nacional de Rosario, 2000, Rosario, Santa Fe, Argentina.
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