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Do UV‐A radiation and blue light during growth prime leaves to cope with acute high light in photoreceptor mutants of Arabidopsis thaliana?
Organismal and Evolutionary Biology Research Programme, Viikki Plant Science Center (ViPS), Faculty of Biological and Environmental Sciences, University of Helsinki, Helsinki, Finland.
Organismal and Evolutionary Biology Research Programme, Viikki Plant Science Center (ViPS), Faculty of Biological and Environmental Sciences, University of Helsinki, Helsinki, Finland. (Molecular Biochemistry)ORCID-id: 0000-0002-9233-7254
Faculty of Science, University of Ostrava, Ostrava, Czech Republic.
Organismal and Evolutionary Biology Research Programme, Viikki Plant Science Center (ViPS), Faculty of Biological and Environmental Sciences, University of Helsinki, Helsinki, Finland.
Vise andre og tillknytning
2019 (engelsk)Inngår i: Physiologia Plantarum: An International Journal for Plant Biology, ISSN 0031-9317, E-ISSN 1399-3054, Vol. 165, nr 3, s. 537-554Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
Blackwell Publishing, 2019. Vol. 165, nr 3, s. 537-554
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Identifikatorer
URN: urn:nbn:se:oru:diva-72399DOI: 10.1111/ppl.12749ISI: 000459312400010PubMedID: 29704249Scopus ID: 2-s2.0-85053120838OAI: oai:DiVA.org:oru-72399DiVA, id: diva2:1288038
Forskningsfinansiär
Academy of Finland, 266523, 304519, 271832
Merknad

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

Tilgjengelig fra: 2019-02-12 Laget: 2019-02-12 Sist oppdatert: 2019-06-17bibliografisk kontrollert

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