Analysis of cytosolic isocitrate dehydrogenase and glutathione reductase 1 in photoperiod-influenced responses to ozone using Arabidopsis knockout mutants.
Plant Cell Environ
; 36(11): 1981-91, 2013 Nov.
Article
em En
| MEDLINE
| ID: mdl-23527794
ABSTRACT
Oxidative stress caused by ozone (O3 ) affects plant development, but the roles of specific redox-homeostatic enzymes in O3 responses are still unclear. While growth day length may affect oxidative stress outcomes, the potential influence of day length context on equal-time exposures to O3 is not known. In Arabidopsisâ
Col-0, day length affected the outcome of O3 exposure. In short-days (SD), few lesions were elicited by treatments that caused extensive lesions in long days (LD). Lesion formation was not associated with significant perturbation of glutathione, ascorbate, NADP(H) or NAD(H). To investigate roles of two genes potentially underpinning this redox stability, O3 responses of mutants for cytosolic NADP-isocitrate dehydrogenase (icdh) and glutathione reductase 1 (gr1) were analysed. Loss of ICDH function did not affect O3 -induced lesions, but slightly increased glutathione oxidation, induction of other cytosolic NADPH-producing enzymes and pathogenesis-related gene 1 (PR1). In gr1, O3 -triggered lesions, salicylic acid accumulation, and induction of PR1 were all decreased relative to Col-0 despite enhanced accumulation of glutathione. Thus, even at identical irradiance and equal-time exposures, day length strongly influences phenotypes triggered by oxidants of atmospheric origin, while in addition to its antioxidant function, the GR-glutathione system seems to play novel signalling roles during O3 exposure.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Temas:
Geral
Base de dados:
MEDLINE
Assunto principal:
Ozônio
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Fotoperíodo
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Arabidopsis
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Citosol
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Proteínas de Arabidopsis
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Glutationa Redutase
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Isocitrato Desidrogenase
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Mutação
Idioma:
En
Revista:
Plant Cell Environ
Assunto da revista:
BOTANICA
Ano de publicação:
2013
Tipo de documento:
Article
País de afiliação:
França