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Multiple roles for Vitamin B6in plant acclimation to UV-B
Department of Plant Biology, University of Pécs, Pécs, Hungary.
Research institute for Viticulture and Oenology, University of Pécs, Pécs, Hungary.
Örebro University, School of Science and Technology. (Molekylär biokemi)ORCID iD: 0000-0003-3315-8835
Department of Plant Biology, University of Pécs, Pécs, Hungary.
2019 (Swedish)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 9, no 1, article id 1259Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
Nature Publishing Group, 2019. Vol. 9, no 1, article id 1259
National Category
Biochemistry and Molecular Biology Botany
Research subject
Biochemistry
Identifiers
URN: urn:nbn:se:oru:diva-70847DOI: 10.1038/s41598-018-38053-wISI: 000457616300148PubMedID: 30718682Scopus ID: 2-s2.0-85061031153OAI: oai:DiVA.org:oru-70847DiVA, id: diva2:1273333
Funder
Swedish Research Council Formas, 942-2015-516Knowledge Foundation, 20130164
Note

Funding Agencies:

New National Excellence Program of the Ministry of Human Capacities  UNKP-17-3-III-PTE-229

Örebro University's Faculty for Business, Science and Technology  

Janos Bolyai Research Scholarship of the Hungarian Academy of Sciences  

European Social Fund  EFOP-3.6.1.-16-2016-00004 

European Union 

Available from: 2018-12-20 Created: 2018-12-20 Last updated: 2019-02-19Bibliographically approved

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