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Multiple roles for ...
Multiple roles for Vitamin B6in plant acclimation to UV-B
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- Czégény, Gyula (författare)
- Department of Plant Biology, University of Pécs, Pécs, Hungary
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- Körösi, Laszlo (författare)
- Research institute for Viticulture and Oenology, University of Pécs, Pécs, Hungary
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- Strid, Åke, Professor, 1960- (författare)
- Örebro universitet,Institutionen för naturvetenskap och teknik,Molekylär biokemi
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- Hideg, Éva, 1960- (författare)
- Department of Plant Biology, University of Pécs, Pécs, Hungary
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(creator_code:org_t)
- 2019-02-04
- 2019
- Svenska.
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Ingår i: Scientific Reports. - : Nature Publishing Group. - 2045-2322. ; 9:1
- Relaterad länk:
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https://doi.org/10.1...
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https://oru.diva-por... (primary) (Raw object)
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https://www.nature.c...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Direct and indirect roles of vitamin B6in leaf acclimation to supplementary UV-B radiation are shown in vitamin B6deficient Arabidopsis thalianamutant rsr4-1 and C24 wild type. Responses to 4 days of 3.9 kJ m-2d-1 biologically effective UV-B dose were compared in terms of leaf photochemistry, vitamer content, and antioxidant enzyme activities; complemented with a comprehensive study of vitamer ROS scavenging capacities. Under UV-B, rsr4-1 leaves lost more (34%) photochemical yield than C24 plants (24%). In the absence of UV-B, rsr4-1 leaves contained markedly less pyridoxal-5’-phosphate (PLP) than C24 ones, but levels increased up to the C24 contents in response to UV-B. Activities of class-III ascorbate and glutathione peroxidases increased in C24 leaves upon the UV-B treatment but not in the rsr4-1 mutant. SOD activities remained the same in C24 but decreased by more than 50% in rsr4-1 under UV-B. Although PLP was shown to be an excellent antioxidant in vitro, our results suggest that the UV-B protective role of B6 vitamers is realized indirectly, via supporting peroxidase defence rather than by direct ROS scavenging. We hypothesize that the two defence pathways are linked through the PLP-dependent biosynthesis of cystein and heme, affecting peroxidases.
Ämnesord
- NATURVETENSKAP -- Biologi -- Biokemi och molekylärbiologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Biochemistry and Molecular Biology (hsv//eng)
- NATURVETENSKAP -- Biologi -- Botanik (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Botany (hsv//eng)
Nyckelord
- Biokemi
- Biochemistry
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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