MURAL - Maynooth University Research Archive Library

    Antioxidant defence in UV-irradiated tobacco leaves is centred on hydrogen-peroxide neutralization

    Majer, Petra and Czegeny, Gyula and Sandor, Gyorgyi and Dix, Philip and Hideg, Eva (2014) Antioxidant defence in UV-irradiated tobacco leaves is centred on hydrogen-peroxide neutralization. Plant Physiology and Biochemistry, 82. pp. 239-243. ISSN 0981-9428

    Download (145kB) | Preview
    Official URL:

    Share your research

    Twitter Facebook LinkedIn GooglePlus Email more...

    Add this article to your Mendeley library


    Greenhouse grown tobacco (Nicotiana tabacum L. cv. Petit Havana) plants were exposed to supplemental UV centred at 318 nm and corresponding to 13.6 kJ m-2 d-1 biologically effective UV-B (280e315 nm) radiation. After 6 days this treatment decreased photosynthesis by 30%. Leaves responded by a large increase in UV-absorbing pigment content and antioxidant capacities. UV-stimulated defence against ROS was strongest in chloroplasts, since activities of plastid enzymes FeSOD and APX had larger relative increases than other, non-plastid specific SODs or peroxidases. In addition, non-enzymatic defence against hydroxyl radicals was doubled in UV treated leaves as compared to controls. In UV treated leaves, the extent of activation of ROS neutralizing capacities followed a peroxidases > hydroxyl-radical neutralization > SOD order. These results suggest that highly effective hydrogen peroxide neutralization is the focal point of surviving UV-inducible oxidative stress and argue against a direct signalling role of hydrogen peroxide in maintaining adaptation to UV, at least in laboratory experiments.

    Item Type: Article
    Additional Information: The definitive published version of this article is available at DOI: 10.1016/j.plaphy.2014.06.011
    Keywords: Antioxidant; Peroxidase; Photosynthesis; Reactive oxygen species; Hydrogen peroxide; Tobacco; UV treatment;
    Academic Unit: Faculty of Science and Engineering > Biology
    Item ID: 6833
    Identification Number:
    Depositing User: Prof. Philip J. Dix
    Date Deposited: 19 Jan 2016 10:33
    Journal or Publication Title: Plant Physiology and Biochemistry
    Publisher: Elsevier
    Refereed: Yes
    Funders: Hungarian Scientific Grant Agency
    Use Licence: This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

    Repository Staff Only(login required)

    View Item Item control page


    Downloads per month over past year

    Origin of downloads