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
Abstract
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: |
https://doi.org/10.1016/j.plaphy.2014.06.011 |
| 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 |
| URI: |
|
| 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 |
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