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Open AccessArticle

Phototropin 1 and 2 Influence Photosynthesis, UV-C Induced Photooxidative Stress Responses, and Cell Death

1
Department of Botany, Institute of Biology, Warsaw University of Life Sciences, Nowoursynowska 159, 02-776 Warsaw, Poland
2
Department of Plant Genetics, Breeding and Biotechnology, Institute of Biology, Warsaw University of Life Sciences, Nowoursynowska 159, 02-776 Warsaw, Poland
3
Department of Plant Biotechnology and Bioinformatics, Ghent University, Technologiepark 71, 9052 Ghent, Belgium
4
VIB Center of Plant Systems Biology, Technologiepark 71, 9052 Ghent, Belgium
*
Authors to whom correspondence should be addressed.
Cells 2021, 10(2), 200; https://doi.org/10.3390/cells10020200
Received: 30 November 2020 / Revised: 10 January 2021 / Accepted: 16 January 2021 / Published: 20 January 2021
(This article belongs to the Special Issue Programmed Cell Death Regulation in Plants)
Phototropins are plasma membrane-associated photoreceptors of blue light and UV-A/B radiation. The Arabidopsis thaliana genome encodes two phototropins, PHOT1 and PHOT2, that mediate phototropism, chloroplast positioning, and stomatal opening. They are well characterized in terms of photomorphogenetic processes, but so far, little was known about their involvement in photosynthesis, oxidative stress responses, and cell death. By analyzing phot1, phot2 single, and phot1phot2 double mutants, we demonstrated that both phototropins influence the photochemical and non-photochemical reactions, photosynthetic pigments composition, stomata conductance, and water-use efficiency. After oxidative stress caused by UV-C treatment, phot1 and phot2 single and double mutants showed a significantly reduced accumulation of H2O2 and more efficient photosynthetic electron transport compared to the wild type. However, all phot mutants exhibited higher levels of cell death four days after UV-C treatment, as well as deregulated gene expression. Taken together, our results reveal that on the one hand, both phot1 and phot2 contribute to the inhibition of UV-C-induced foliar cell death, but on the other hand, they also contribute to the maintenance of foliar H2O2 levels and optimal intensity of photochemical reactions and non-photochemical quenching after an exposure to UV-C stress. Our data indicate a novel role for phototropins in the condition-dependent optimization of photosynthesis, growth, and water-use efficiency as well as oxidative stress and cell death response after UV-C exposure. View Full-Text
Keywords: phototropins; Arabidopsis thaliana; chloroplasts; photosynthesis; oxidative stress; transcriptome phototropins; Arabidopsis thaliana; chloroplasts; photosynthesis; oxidative stress; transcriptome
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MDPI and ACS Style

Rusaczonek, A.; Czarnocka, W.; Willems, P.; Sujkowska-Rybkowska, M.; Van Breusegem, F.; Karpiński, S. Phototropin 1 and 2 Influence Photosynthesis, UV-C Induced Photooxidative Stress Responses, and Cell Death. Cells 2021, 10, 200. https://doi.org/10.3390/cells10020200

AMA Style

Rusaczonek A, Czarnocka W, Willems P, Sujkowska-Rybkowska M, Van Breusegem F, Karpiński S. Phototropin 1 and 2 Influence Photosynthesis, UV-C Induced Photooxidative Stress Responses, and Cell Death. Cells. 2021; 10(2):200. https://doi.org/10.3390/cells10020200

Chicago/Turabian Style

Rusaczonek, Anna; Czarnocka, Weronika; Willems, Patrick; Sujkowska-Rybkowska, Marzena; Van Breusegem, Frank; Karpiński, Stanisław. 2021. "Phototropin 1 and 2 Influence Photosynthesis, UV-C Induced Photooxidative Stress Responses, and Cell Death" Cells 10, no. 2: 200. https://doi.org/10.3390/cells10020200

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