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Qian M, Rosenqvist E, Prinsen E, et al. Downsizing in plants-UV light induces pronounced morphological changes in the absence of stress. Plant Physiol. 2021;187(1):378-395doi: 10.1093/plphys/kiab262.
Qian, M., Rosenqvist, E., Prinsen, E., Pescheck, F., Flygare, A. M., Kalbina, I., Jansen, M. A. K., & Strid, �. �. (2021). Downsizing in plants-UV light induces pronounced morphological changes in the absence of stress. Plant physiology, 187(1), 378-395. https://doi.org/10.1093/plphys/kiab262
Qian, Minjie, et al. "Downsizing in plants-UV light induces pronounced morphological changes in the absence of stress." Plant physiology vol. 187,1 (2021): 378-395. doi: https://doi.org/10.1093/plphys/kiab262
Qian M, Rosenqvist E, Prinsen E, Pescheck F, Flygare AM, Kalbina I, Jansen MAK, Strid Å. Downsizing in plants-UV light induces pronounced morphological changes in the absence of stress. Plant Physiol. 2021 Sep 04;187(1):378-395. doi: 10.1093/plphys/kiab262. PMID: 34618138; PMCID: PMC8418406.
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Plant Physiol. 2021 Sep 04;187(1):378-395. doi: 10.1093/plphys/kiab262.

Downsizing in plants-UV light induces pronounced morphological changes in the absence of stress.

Plant physiology

Minjie Qian, Eva Rosenqvist, Els Prinsen, Frauke Pescheck, Ann-Marie Flygare, Irina Kalbina, Marcel A K Jansen, Åke Strid

Affiliations

  1. Örebro Life Science Center, School of Science and Technology, Örebro University, SE-70182 Örebro, Sweden.
  2. College of Horticulture, Hainan University, Haikou 570228, China.
  3. Section of Crop Sciences, Department of Plant and Environmental Sciences, University of Copenhagen, Højbakkegård Allé 9, DK-2630 Taastrup, Denmark.
  4. Integrated Molecular Plant Physiology Research, Department of Biology, University of Antwerpen, Groenenborgerlaan 171, B-2020 Antwerpen, Belgium.
  5. Botanical Institute, Christian-Albrechts-University Kiel, Olshausenstraße 40, 24098 Kiel, Germany.
  6. Statistics Unit, School of Business, Örebro University, SE-70182 Örebro, Sweden.
  7. School of Biological, Earth and Environmental Sciences, Environmental Research Institute, University College Cork, North Mall, T23 TK30 Cork, Ireland.

PMID: 34618138 PMCID: PMC8418406 DOI: 10.1093/plphys/kiab262

Abstract

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.

© The Author(s) 2021. Published by Oxford University Press on behalf of American Society of Plant Biologists.

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