Differences in the ROS-generating efficacy of various ultraviolet wavelengths in detached spinach leaves

Functional Plant Biology : FPB
Csengele BartaEva Hideg

Abstract

The capacity of ultraviolet (UV) radiation to generate reactive oxygen species (ROS) in spinach leaves was studied with fluorescent sensors. Leaf segments were exposed to short-term (15-30 min), narrow-band UV irradiation of various wavelengths between 290-390 nm corresponding to equal numbers of photons and, depending on the wavelength, 18-36 μmol m-2 s-1 quantum flux. This caused 5-30% loss of photosynthesis measured as loss of variable chlorophyll fluorescence. In accordance with previous results, photosynthesis was less affected by longer than by shorter wavelength UV. UV-irradiated leaves were probed for two major representatives of ROS, namely the superoxide radical anion, a product of electron transfer to oxygen, and singlet oxygen, which is usually formed in photosensitised reactions between oxygen and triplet dyes. Both ROS were detected, but the efficacy of UV in promoting their production was different. Formation of superoxide radicals was positively correlated with loss of photosynthesis; more radicals were observed in leaves exposed to shorter UV wavelengths than in leaves irradiated at 370-390 nm, suggesting a functionally damaged electron transport as a possible site of oxygen reduction. Singlet oxygen was, howev...Continue Reading

Citations

Feb 4, 2011·Physiologia Plantarum·Marja Hakala-YatkinEsa Tyystjärvi
Jan 17, 2013·Antioxidants & Redox Signaling·Beat B FischerAnja Krieger-Liszkay
Sep 13, 2017·Phytochemical Analysis : PCA·Kristóf Csepregi, Éva Hideg
Feb 6, 2019·Scientific Reports·Gyula CzégényÉva Hideg
Jun 18, 2019·BioMed Research International·Xiulan XieYi Cai
Aug 31, 2018·Plant, Cell & Environment·Silvana RighiniMaría Lorena Falcone Ferreyra
Jan 1, 2008·Functional Plant Biology : FPB·Iva ŠnyrychováÉva Hideg
Mar 9, 2007·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·M M CaldwellG Kulandaivelu
Jan 14, 2017·International Journal of Phytoremediation·Marina RafiqCamille Dumat
Apr 30, 2009·Annual Review of Plant Biology·Gareth I Jenkins
Jun 24, 2021·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Rengin OzgurIsmail Turkan

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