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231224s2014 xx |||||o 00| ||eng c |
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|a 10.1016/j.plaphy.2014.06.011
|2 doi
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|a pubmed24n1223.xml
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|a (DE-627)NLM239862716
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|a (NLM)25000557
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|a (PII)S0981-9428(14)00192-2
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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|a Majer, Petra
|e verfasserin
|4 aut
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|a Antioxidant defence in UV-irradiated tobacco leaves is centred on hydrogen-peroxide neutralization
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|c 2014
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|2 rdamedia
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|a ƒa Online-Ressource
|b cr
|2 rdacarrier
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|a Date Completed 30.03.2015
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|a Date Revised 13.12.2023
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a Copyright © 2014 Elsevier Masson SAS. All rights reserved.
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|a 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 (280-315 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
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Antioxidant
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|a Hydrogen peroxide
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|a Peroxidase
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|a Photosynthesis
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|a Reactive oxygen species
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|a Tobacco
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|a UV treatment
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|a Antioxidants
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|a Reactive Oxygen Species
|2 NLM
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|a Hydrogen Peroxide
|2 NLM
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|a BBX060AN9V
|2 NLM
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|a Peroxidases
|2 NLM
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|a EC 1.11.1.-
|2 NLM
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|a Ascorbate Peroxidases
|2 NLM
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|a EC 1.11.1.11
|2 NLM
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|a Czégény, Gyula
|e verfasserin
|4 aut
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|a Sándor, Györgyi
|e verfasserin
|4 aut
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|a Dix, Philip J
|e verfasserin
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|a Hideg, Eva
|e verfasserin
|4 aut
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|i Enthalten in
|t Plant physiology and biochemistry : PPB
|d 1991
|g 82(2014) vom: 29. Sept., Seite 239-43
|w (DE-627)NLM098178261
|x 1873-2690
|7 nnns
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|g volume:82
|g year:2014
|g day:29
|g month:09
|g pages:239-43
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|u http://dx.doi.org/10.1016/j.plaphy.2014.06.011
|3 Volltext
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