Singlet oxygen scavenging activity of tocopherol and plastochromanol in Arabidopsis thaliana: relevance to photooxidative stress.
Plant Cell Environ
; 37(2): 392-401, 2014 Feb.
Article
em En
| MEDLINE
| ID: mdl-23848570
ABSTRACT
In the present study, singlet oxygen (¹O2) scavenging activity of tocopherol and plastochromanol was examined in tocopherol cyclase-deficient mutant (vte1) of Arabidopsis thaliana lacking both tocopherol and plastochromanol. It is demonstrated here that suppression of tocopherol and plastochromanol synthesis in chloroplasts isolated from vte1 Arabidopsis plants enhanced ¹O2 formation under high light illumination as monitored by electron paramagnetic resonance spin-trapping spectroscopy. The exposure of vte1 Arabidopsis plants to high light resulted in the formation of secondary lipid peroxidation product malondialdehyde as determined by high-pressure liquid chromatography. Furthermore, it is shown here that the imaging of ultra-weak photon emission known to reflect oxidation of lipids was unambiguously higher in vte1 Arabidopsis plants. Our results indicate that tocopherol and plastochromanol act as efficient ¹O2 scavengers and protect effectively lipids against photooxidative damage in Arabidopsis plants.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Sequestradores de Radicais Livres
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Arabidopsis
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Estresse Oxidativo
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Oxigênio Singlete
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Tocoferóis
Idioma:
En
Ano de publicação:
2014
Tipo de documento:
Article