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Morales, Luis OrlandoORCID iD iconorcid.org/0000-0002-9233-7254
Publications (10 of 24) Show all publications
Robson, T. M., Aphalo, P. J., Banas, A. K., Barnes, P. W., Brelsford, C. C., Jenkins, G. I., . . . Jansen, M. A. K. (2019). A perspective on ecologically relevant plant-UV research and its practical application. Photochemical and Photobiological Sciences, 18(5), 970-988
Open this publication in new window or tab >>A perspective on ecologically relevant plant-UV research and its practical application
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2019 (English)In: Photochemical and Photobiological Sciences, ISSN 1474-905X, E-ISSN 1474-9092, Vol. 18, no 5, p. 970-988Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2019
National Category
Biological Sciences
Research subject
Biology
Identifiers
urn:nbn:se:oru:diva-71938 (URN)10.1039/C8PP00526E (DOI)000468060100003 ()30720036 (PubMedID)2-s2.0-85065862092 (Scopus ID)
Note

Funding Agencies:

Academy of Finland  304519  266523 

Ministerio de Economia y Competitividad of Spain (MINECO)  

Fondo Europeo de Desarrollo Regional (FEDER)  CGL2014-54127-P 

Polish National Science Centre  UMO-2016/22/E/NZ3/00326  UMO-2017/25/B/NZ3/01080 

UV4Plants  

Doctoral Programme in Plant Science of the University of Helsinki  

Deutsche Forschungsgemeinschaft (DFG)  359552155 

Region Haute-Normandie GRR-TERA SCALE, UFOSE Project  

Ghent University  

Research Foundation Flanders (FWO)  G000515N 

Science Foundation Ireland  16-IA-4418 

Available from: 2019-01-30 Created: 2019-01-30 Last updated: 2019-06-20Bibliographically approved
Brelsford, C. C., Morales, L. O., Nezval, J., Kotilainen, T. K., Hartikainen, S. M., Aphalo, P. J. & Robson, M. (2019). Do UV‐A radiation and blue light during growth prime leaves to cope with acute high light in photoreceptor mutants of Arabidopsis thaliana?. Physiologia Plantarum: An International Journal for Plant Biology, 165(3), 537-554
Open this publication in new window or tab >>Do UV‐A radiation and blue light during growth prime leaves to cope with acute high light in photoreceptor mutants of Arabidopsis thaliana?
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2019 (English)In: Physiologia Plantarum: An International Journal for Plant Biology, ISSN 0031-9317, E-ISSN 1399-3054, Vol. 165, no 3, p. 537-554Article in journal (Refereed) Published
Abstract [en]

We studied how plants acclimated to growing conditions that included combinations of blue light (BL) and ultraviolet (UV)‐A radiation, and whether their growing environment affected their photosynthetic capacity during and after a brief period of acute high light (as might happen during an under‐canopy sunfleck). Arabidopsis thaliana Landsberg erecta wild‐type were compared with mutants lacking functional blue light and UV photoreceptors: phototropin 1, cryptochromes (CRY1 and CRY2) and UV RESISTANT LOCUS 8 (uvr8). This was achieved using light‐emitting‐diode (LED) lamps in a controlled environment to create treatments with or without BL, in a split‐plot design with or without UV‐A radiation. We compared the accumulation of phenolic compounds under growth conditions and after exposure to 30 min of high light at the end of the experiment (46 days), and likewise measured the operational efficiency of photosystem II (ϕPSII, a proxy for photosynthetic performance) and dark‐adapted maximum quantum yield (Fv/Fm to assess PSII damage). Our results indicate that cryptochromes are the main photoreceptors regulating phenolic compound accumulation in response to BL and UV‐A radiation, and a lack of functional cryptochromes impairs photosynthetic performance under high light. Our findings also reveal a role for UVR8 in accumulating flavonoids in response to a low UV‐A dose. Interestingly, phototropin 1 partially mediated constitutive accumulation of phenolic compounds in the absence of BL. Low‐irradiance BL and UV‐A did not improve ϕPSII and Fv/Fm upon our acute high‐light treatment; however, CRYs played an important role in ameliorating high‐light stress.

Place, publisher, year, edition, pages
Blackwell Publishing, 2019
National Category
Botany Biochemistry and Molecular Biology
Identifiers
urn:nbn:se:oru:diva-72399 (URN)10.1111/ppl.12749 (DOI)000459312400010 ()29704249 (PubMedID)2-s2.0-85053120838 (Scopus ID)
Funder
Academy of Finland, 266523, 304519, 271832
Note

Funding agencies:

Czech Ministry of Education, Youth and Sports Project LO1208 ‘TEWEP’ National Feasibility Programme I

EU Structural Funding Operational Programme Research and Development for Innovation Project, CZ.1.05/2.1.00/19.0388

Available from: 2019-02-12 Created: 2019-02-12 Last updated: 2019-06-17Bibliographically approved
Rai, N., Neugart, S., Yan, Y., Wang, F., Siipola, S. M., Lindfors, A. V., . . . Aphalo, P. J. (2019). How do cryptochromes and UVR8 interact in natural and simulated sunlight?. Journal of Experimental Botany
Open this publication in new window or tab >>How do cryptochromes and UVR8 interact in natural and simulated sunlight?
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2019 (English)In: Journal of Experimental Botany, ISSN 0022-0957, E-ISSN 1460-2431Article in journal (Refereed) Epub ahead of print
Abstract [en]

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 thaliana wild-type Ler, CRYs and UVR8 photoreceptor mutants (uvr82, cry1cry2 and cry1cry2uvr82), 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.

Place, publisher, year, edition, pages
Oxford University Press, 2019
Keywords
Arabidopsis thaliana, blue light, cryptochromes, flavonoids, photoreceptor interaction, sun simulator, solar radiation, transcript abundance, ultraviolet radiation, UVR8
National Category
Genetics Botany
Research subject
Biology
Identifiers
urn:nbn:se:oru:diva-74549 (URN)10.1093/jxb/erz236 (DOI)
Available from: 2019-06-03 Created: 2019-06-03 Last updated: 2019-06-19Bibliographically approved
O'Hara, A., Headland, L. R., Díaz-Ramos, L. A., Morales, L. O., Strid, Å. & Jenkins, G. I. (2019). Regulation of Arabidopsis gene expression by low fluence rate UV-B independently of UVR8 and stress signaling. Photochemical and Photobiological Sciences, 18(7), 1675-1684
Open this publication in new window or tab >>Regulation of Arabidopsis gene expression by low fluence rate UV-B independently of UVR8 and stress signaling
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2019 (English)In: Photochemical and Photobiological Sciences, ISSN 1474-905X, E-ISSN 1474-9092, Vol. 18, no 7, p. 1675-1684Article in journal (Refereed) Published
Abstract [en]

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).

Place, publisher, year, edition, pages
RSC Publishing, 2019
National Category
Biochemistry and Molecular Biology
Identifiers
urn:nbn:se:oru:diva-74760 (URN)10.1039/C9PP00151D (DOI)000477947100005 ()31218318 (PubMedID)2-s2.0-85068743324 (Scopus ID)
Funder
Knowledge Foundation, 20130164Swedish Research Council Formas, 942-2015-516
Note

Funding Agencies:

UK Biotechnology and Biological Sciences research council PhD studentships at the University of Glasgow

Faculty for Business, Science, and Technology at Örebro University  

Strategic Young Researchers Recruitment Programme at Örebro University  

University of Glasgow 

Available from: 2019-06-20 Created: 2019-06-20 Last updated: 2019-08-12Bibliographically approved
Yan, Y., Stoddard, F. L., Neugart, S., Sadras, V. O., Lindfors, A., Morales, L. O. & Aphalo, P. J. (2019). Responses of flavonoid profile and associated gene expression to solar blue and UV radiation in two accessions of Vicia faba L. from contrasting UV environments. Photochemical and Photobiological Sciences, 18(2), 434-447
Open this publication in new window or tab >>Responses of flavonoid profile and associated gene expression to solar blue and UV radiation in two accessions of Vicia faba L. from contrasting UV environments
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2019 (English)In: Photochemical and Photobiological Sciences, ISSN 1474-905X, E-ISSN 1474-9092, Vol. 18, no 2, p. 434-447Article in journal (Refereed) Published
Abstract [en]

Blue light and UV radiation shape a plant's morphology and development, but accession-dependent responses under natural conditions are unclear. Here we tested the hypothesis that two faba bean (Vicia faba L.) accessions adapted to different latitudes and altitudes vary in their responses to solar blue and UV light. We measured growth, physiological traits, phenolic profiles and expression of associated genes in a factorial experiment combining two accessions (Aurora, a Swedish cultivar adapted to high latitude and low altitude; ILB938, from the Andean region of Colombia and Ecuador, adapted to low latitude and high altitude) and four filter treatments created with plastic sheets: 1. transparent as control; 2. attenuated short UV (290-350 nm); 3. attenuated UV (290-400 nm); 4. attenuated blue and UV light. In both accessions, the exclusion of blue and UV light increased plant height and leaf area, and decreased transcript abundance of ELONGATED HYPOCOTYL 5 (HY5) and TYROSINE AMINOTRANSFERASE 3 (TAT3). Blue light and short UV induced the accumulation of epidermal and whole-leaf flavonoids, mainly quercetins, and the responses in the two accessions were through different glycosides. Filter treatments did not affect kaempferol concentration, but there were more tri-glycosides in Aurora and di-glycosides in ILB938. Furthermore, fewer quercetin glycosides were identified in ILB938. The transcript abundance was consistently higher in Aurora than in ILB938 for all seven investigated genes: HY5, TAT3, CHALCONE SYNTHASE (CHS), CHALCONE ISOMERASE (CHI), DON-GLUCOSYLTRANSFERASE 1 (DOGT1), ABA INSENSITIVE 2 (ABI2), AUXIN-INDUCIBLE 2-27 (IAA5). The two largest differences in transcript abundance between the two accessions across treatments were 132-fold in CHS and 30-fold in DOGT1 which may explain the accession-dependent glycosylation patterns. Our findings suggest that agronomic selection for adaptation to high altitude may favour phenotypes with particular adaptations to the light environment, including solar UV and blue light.

Place, publisher, year, edition, pages
RSC Publishing, 2019
National Category
Biochemistry and Molecular Biology Biophysics
Identifiers
urn:nbn:se:oru:diva-71454 (URN)10.1039/c8pp00567b (DOI)000458569100016 ()30629071 (PubMedID)2-s2.0-85061371808 (Scopus ID)
Note

Funding Agency:

China Scholarship Council 

Available from: 2019-01-17 Created: 2019-01-17 Last updated: 2019-06-18Bibliographically approved
Morales, L. O. (2018). ROS regulation of gene expression and cell death in Arabidopsis: From natural variation to miRNAs. In: : . Paper presented at 29th International Conference on Arabidopsis Research (ICAR 2018), Turku, Finland, June 25-29, 2018.
Open this publication in new window or tab >>ROS regulation of gene expression and cell death in Arabidopsis: From natural variation to miRNAs
2018 (English)Conference paper, Poster (with or without abstract) (Other academic)
National Category
Biochemistry and Molecular Biology Botany
Research subject
Biology
Identifiers
urn:nbn:se:oru:diva-74767 (URN)
Conference
29th International Conference on Arabidopsis Research (ICAR 2018), Turku, Finland, June 25-29, 2018
Available from: 2019-06-24 Created: 2019-06-24 Last updated: 2019-06-24Bibliographically approved
Barnes, P. W., Morales, L. O. & Robson, T. M. (2018). The importance and direction of current and future plant-UV research. UV4Plants Bulletin, 2, 19-32
Open this publication in new window or tab >>The importance and direction of current and future plant-UV research
2018 (English)In: UV4Plants Bulletin, ISSN 2343-323X, Vol. 2, p. 19-32Article in journal, Editorial material (Refereed) Published
Abstract [en]

Background

To stimulate how to move the field of plant-UV research forward, and create a coherent framework to highlight valuable future directions in plant UV research we had a group discussion of the most prescient questions and how to address them.

The following sections are broken-down into those from the molecular, biochemical and physiological discussions followed by those from the ecological and plant production discussions. In each case, first basic research questions are considered and then applications and methodological considerations put forward. Finally, some common ground bringing together the two perspectives is proposed, aimed at solving scaling problems and ways in which the UV4Plants network might be put to good use.

Place, publisher, year, edition, pages
The UV4Plants International Association, 2018
Keywords
UV4Plants
National Category
Biochemistry and Molecular Biology
Identifiers
urn:nbn:se:oru:diva-72398 (URN)10.19232/uv4pb.2018.2.11 (DOI)
Available from: 2019-02-12 Created: 2019-02-12 Last updated: 2019-02-27Bibliographically approved
Morales, L. O. (2018). UVR8 and cryptochromes promote sunlight acclimation in Arabidopsis thaliana. In: : . Paper presented at 2nd UV4Plants Network Meeting, Bled, Slovenia, April 15-18, 2018.
Open this publication in new window or tab >>UVR8 and cryptochromes promote sunlight acclimation in Arabidopsis thaliana
2018 (English)Conference paper, Oral presentation only (Other academic)
National Category
Biochemistry and Molecular Biology
Research subject
Biology
Identifiers
urn:nbn:se:oru:diva-74766 (URN)
Conference
2nd UV4Plants Network Meeting, Bled, Slovenia, April 15-18, 2018
Available from: 2019-06-24 Created: 2019-06-24 Last updated: 2019-07-01Bibliographically approved
Verdaguer, D., Jansen, M. A. .., Llorens, L., Morales, L. O. & Neugart, S. (2017). UV-A radiation effects on higher plants: Exploring the known unknown. Plant Science, 255, 72-81
Open this publication in new window or tab >>UV-A radiation effects on higher plants: Exploring the known unknown
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2017 (English)In: Plant Science, ISSN 0168-9452, E-ISSN 1873-2259, Vol. 255, p. 72-81Article in journal (Refereed) Published
Abstract [en]

Ultraviolet-A radiation (UV-A: 315–400 nm) is a component of solar radiation that exerts a wide range of physiological responses in plants. Currently, field attenuation experiments are the most reliable source of information on the effects of UV-A. Common plant responses to UV-A include both inhibitory and stimulatory effects on biomass accumulation and morphology. UV-A effects on biomass accumulation can differ from those on root: shoot ratio, and distinct responses are described for different leaf tissues. Inhibitory and enhancing effects of UV-A on photosynthesis are also analysed, as well as activation of photoprotective responses, including UV-absorbing pigments. UV-A-induced leaf flavonoids are highly compound-specific and species-dependent. Many of the effects on growth and development exerted by UV-A are distinct to those triggered by UV-B and vary considerably in terms of the direction the response takes. Such differences may reflect diverse UV-perception mechanisms with multiple photoreceptors operating in the UV-A range and/or variations in the experimental approaches used. This review highlights a role that various photoreceptors (UVR8, phototropins, phytochromes and cryptochromes) may play in plant responses to UV-A when dose, wavelength and other conditions are taken into account.

Place, publisher, year, edition, pages
Elsevier, 2017
Keywords
Ultraviolet-A, Plant biomass, Morphology, Photosynthesis, Photodamage, Phenolics
National Category
Botany Biochemistry and Molecular Biology
Identifiers
urn:nbn:se:oru:diva-72400 (URN)10.1016/j.plantsci.2016.11.014 (DOI)000394194800008 ()28131343 (PubMedID)2-s2.0-85003976956 (Scopus ID)
Funder
Academy of Finland
Note

Funding agencies:

Spanish Government, CGL2010-2283

University of Girona, MPCUdG2016

Foundation Ireland, 11/RFP.1/EOB/3303

COST Action FA0906, UV4Growth

Available from: 2019-02-12 Created: 2019-02-12 Last updated: 2019-02-22Bibliographically approved
Morales, L. O., Brosché, M., Vainonen, J. P., Sipari, N., Lindfors, A., Strid, Å. & Aphalo, P. J. (2015). Are solar UV-B- and UV-A-dependent gene expression and metabolite accumulation in Arabidopsis mediated by the stress response regulator RADICAL-INDUCED CELL DEATH1?. Plant, Cell and Environment, 38(5), 878-891
Open this publication in new window or tab >>Are solar UV-B- and UV-A-dependent gene expression and metabolite accumulation in Arabidopsis mediated by the stress response regulator RADICAL-INDUCED CELL DEATH1?
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2015 (English)In: Plant, Cell and Environment, ISSN 0140-7791, E-ISSN 1365-3040, Vol. 38, no 5, p. 878-891Article in journal (Refereed) Published
Abstract [en]

Wavelengths in the ultraviolet (UV) region of the solar spectrum, UV-B (280-315nm) and UV-A (315-400nm), are key environmental signals modifying several aspects of plant physiology. Despite significant advances in the understanding of plant responses to UV-B and the identification of signalling components involved, there is limited information on the molecular mechanisms that control UV-B signalling in plants under natural sunlight. Here, we aimed to corroborate the previous suggested role for RADICAL-INDUCED CELL DEATH1 (RCD1) in UV-B signalling under full spectrum sunlight. Wild-type Arabidopsis thaliana and the rcd1-1 mutant were used in an experimental design outdoors where UV-B and UV-A irradiances were manipulated using plastic films, and gene expression, PYRIDOXINE BIOSYNTHESIS1 (PDX1) accumulation and metabolite profiles were analysed in the leaves. At the level of transcription, RCD1 was not directly involved in the solar UV-B regulation of genes with functions in UV acclimation, hormone signalling and stress-related markers. Furthermore, RCD1 had no role on PDX1 accumulation but modulated the UV-B induction of flavonoid accumulation in leaves of Arabidopsis exposed to solar UV. We conclude that RCD1 does not play an active role in UV-B signalling but rather modulates UV-B responses under full spectrum sunlight.

Keywords
Flavonoids; RCD1; Signalling; Solar UV; Stress; UV acclimation
National Category
Botany Biochemistry and Molecular Biology
Research subject
Biochemistry
Identifiers
urn:nbn:se:oru:diva-34535 (URN)10.1111/pce.12341 (DOI)000353898400004 ()24689869 (PubMedID)2-s2.0-84927723426 (Scopus ID)
Note

Funding Agencies:

Academy of Finland 116775 135751 140981

Finnish Cultural Foundation

LignoCell - TEKES

LignoCell - Academy of Finland

Available from: 2014-04-01 Created: 2014-04-01 Last updated: 2019-03-26Bibliographically approved
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Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-9233-7254

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