Downsizing in plants—UV light induces pronounced morphological changes in the absence of stress
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- Downsizing in plants—UV light induces pronounced morphological changes in the absence of stress
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Ultraviolet (UV) light induces a stocky phenotype in many plant species. In this study, we investigate this effect with regard to specific UV wavebands (UV-A or UV-B) and the cause for this dwarfing. UV-A- or UV-B-enrichment of growth light both resulted in a smaller cucumber (Cucumis sativus L.) phenotype, exhibiting decreased stem and petiole lengths and leaf area (LA). Effects were larger in plants grown in UV-B- than in UV-A-enriched light. In plants grown in UV-A-enriched light, decreases in stem and petiole lengths were similar independent of tissue age. In the presence of UV-B radiation, stems and petioles were progressively shorter the younger the tissue. Also, plants grown under UV-A-enriched light significantly reallocated photosynthates from shoot to root and also had thicker leaves with decreased specific LA. Our data therefore imply different morphological plant regulatory mechanisms under UV-A and UV-B radiation. There was no evidence of stress in the UV-exposed plants, neither in photosynthetic parameters, total chlorophyll content, or in accumulation of damaged DNA (cyclobutane pyrimidine dimers). The abscisic acid content of the plants also was consistent with non-stress conditions. Parameters such as total leaf antioxidant activity, leaf adaxial epidermal flavonol content and foliar total UV-absorbing pigment levels revealed successful UV acclimation of the plants. Thus, the UV-induced dwarfing, which displayed different phenotypes depending on UV wavelengths, occurred in healthy cucumber plants, implying a regulatory adjustment as part of the UV acclimation processes involving UV-A and/or UV-B photoreceptors.
Originalsprog | Engelsk |
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Tidsskrift | Plant Physiology |
Vol/bind | 187 |
Udgave nummer | 1 |
Sider (fra-til) | 378-395 |
Antal sider | 18 |
ISSN | 0032-0889 |
DOI | |
Status | Udgivet - 2021 |
Bibliografisk note
Funding Information:
This research was supported by grants to Å.S. from the Knowledge Foundation (kks.se; contract no. 20130164) and the Swedish Research Council Formas (formas.se/en; Contract no. 942-2015-516). The Örebro University’s Faculty for Business, Science and Technology also supported the research. M.A.K.J. acknowledges support by Science Foundation Ireland (S16/IA/4418). E.P. acknowledges support by the Flemish Science Foundation (FWO, grant G000515N). M.Q. was sponsored by the China Scholarship Council (CSC no. 201406320076).
Publisher Copyright:
© The Author(s) 2021.
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