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231224s2012 xx |||||o 00| ||eng c |
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|a 10.1093/jxb/err386
|2 doi
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|a pubmed24n0712.xml
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|a (DE-627)NLM213588331
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|a (NLM)22140244
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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 Hebbelmann, Inga
|e verfasserin
|4 aut
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|a Multiple strategies to prevent oxidative stress in Arabidopsis plants lacking the malate valve enzyme NADP-malate dehydrogenase
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|c 2012
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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
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|2 rdacarrier
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|a Date Completed 01.06.2012
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|a Date Revised 21.10.2021
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a The nuclear-encoded chloroplast NADP-dependent malate dehydrogenase (NADP-MDH) is a key enzyme controlling the malate valve, to allow the indirect export of reducing equivalents. Arabidopsis thaliana (L.) Heynh. T-DNA insertion mutants of NADP-MDH were used to assess the role of the light-activated NADP-MDH in a typical C(3) plant. Surprisingly, even when exposed to high-light conditions in short days, nadp-mdh knockout mutants were phenotypically indistinguishable from the wild type. The photosynthetic performance and typical antioxidative systems, such as the Beck-Halliwell-Asada pathway, were barely affected in the mutants in response to high-light treatment. The reactive oxygen species levels remained low, indicating the apparent absence of oxidative stress, in the mutants. Further analysis revealed a novel combination of compensatory mechanisms in order to maintain redox homeostasis in the nadp-mdh plants under high-light conditions, particularly an increase in the NTRC/2-Cys peroxiredoxin (Prx) system in chloroplasts. There were indications of adjustments in extra-chloroplastic components of photorespiration and proline levels, which all could dissipate excess reducing equivalents, sustain photosynthesis, and prevent photoinhibition in nadp-mdh knockout plants. Such metabolic flexibility suggests that the malate valve acts in concert with other NADPH-consuming reactions to maintain a balanced redox state during photosynthesis under high-light stress in wild-type plants
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Malate Dehydrogenase (NADP+)
|2 NLM
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|a EC 1.1.1.82
|2 NLM
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|a Selinski, Jennifer
|e verfasserin
|4 aut
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|a Wehmeyer, Corinna
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|a Goss, Tatjana
|e verfasserin
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|a Voss, Ingo
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|a Mulo, Paula
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|a Kangasjärvi, Saijaliisa
|e verfasserin
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|a Aro, Eva-Mari
|e verfasserin
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|a Oelze, Marie-Luise
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|a Dietz, Karl-Josef
|e verfasserin
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|a Nunes-Nesi, Adriano
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|4 aut
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|a Do, Phuc T
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|a Fernie, Alisdair R
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|a Talla, Sai K
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|a Raghavendra, Agepati S
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|a Linke, Vera
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|a Scheibe, Renate
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Journal of experimental botany
|d 1985
|g 63(2012), 3 vom: 15. Feb., Seite 1445-59
|w (DE-627)NLM098182706
|x 1460-2431
|7 nnns
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| 773 |
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|g volume:63
|g year:2012
|g number:3
|g day:15
|g month:02
|g pages:1445-59
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|u http://dx.doi.org/10.1093/jxb/err386
|3 Volltext
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