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Influence of UV-Light on the Expression of the Cat2 and Cat3 Catalase Genes in Maize

Identifieur interne : 000282 ( Main/Exploration ); précédent : 000281; suivant : 000283

Influence of UV-Light on the Expression of the Cat2 and Cat3 Catalase Genes in Maize

Auteurs : Ralf Boldt [États-Unis] ; John G. Scandalios [Allemagne]

Source :

Free Radical Biology and Medicine [ 0891-5849 ] ; 1997.

RBID : ISTEX:E7A94F9DE165534FB6CC9114CBD0B3A2BC917842

Descripteurs français

Wicri :
- topic : Génétique, Maïs, Plant.

English descriptors

Abstract

Abstract: The effects of UV (ultraviolet)-irradiation on the expression of the antioxidant genes Cat2 and Cat3, encoding the CAT-2 and CAT-3 catalases in maize were examined. Cat2 and Cat3 transcript accumulation was analyzed in leaves of maize seedlings grown under different light conditions, and subsequently exposed to UV-light. Under DD-(constant darkness) and LL- (continuous light) conditions, as well as under a 12h D/L- (dark/light) photoperiod, the Cat2 mRNA was expressed at low and constant levels. In contrast, Cat3 transcript accumulation was constant and about 10 times higher than that of Cat2 under DD or LL, while the expression of Cat3 exhibits a typical circadian rhythm under a 12h D/L photoperiod. UV-light pulses in the range of 290 to 400 nm strongly induce the expression of Cat2. Upon removing the UV-B portion (290–310 nm) of the UV-spectrum the maximal Cat2 transcript level was reduced by about 60%. On applying UV-light of the same quality in addition to visible light, the expression of Cat2 was induced. DNA damage caused by UV-light and induction mediated by a UV-light photosensory system are suggested. Further, it is suggested that the Cat3 circadian rhythm may be regulated by a blue light/UV-A and a UV-B photoreceptor. If DD and LL grown plants that exhibit no circadian oscillation, were exposed to constant UV-light in the range of 290 to 400 nm a circadian rhythm was induced; indicating that UV-light may function as an additional environmental cue to entrain the Cat3 circadian rhythm. Since, Cat2 and Cat3 showed distinct responses to UV light, it is suggested that both genes may act to scavenge reactive oxygen species (ROS) generated by UV-light to protect the plant from oxidative damage.

Url:

https://api.istex.fr/document/E7A94F9DE165534FB6CC9114CBD0B3A2BC917842/fulltext/pdf

DOI: 10.1016/S0891-5849(97)00111-1

Affiliations:

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Le document en format XML

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<term>Blue light photoreceptor</term>
<term>Boca raton</term>
<term>Boldt</term>
<term>Carolina state university</term>
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<term>Cat2</term>
<term>Cat2 expression</term>
<term>Cat2 gene</term>
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<term>Cat2 mrna accumulation</term>
<term>Cat3</term>
<term>Cat3 catalase gene</term>
<term>Cat3 catalase genes</term>
<term>Cat3 circadian expression</term>
<term>Cat3 circadian rhythm</term>
<term>Cat3 gene</term>
<term>Cat3 genes</term>
<term>Cat3 mrna accumulation</term>
<term>Cat3 transcript accumulation</term>
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<term>Catalase genes</term>
<term>Circadian</term>
<term>Circadian regulation</term>
<term>Circadian rhythm</term>
<term>Constant light</term>
<term>Continuous darkness</term>
<term>Continuous light</term>
<term>Cyclic light signal</term>
<term>Dark control</term>
<term>Different light conditions</term>
<term>Distinct response</term>
<term>Etiolated maize seedlings</term>
<term>Free radicals</term>
<term>Full spectrum light pulse</term>
<term>Gene</term>
<term>Genetics</term>
<term>Hybridization signals</term>
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<term>Leaf material</term>
<term>Leaf sample</term>
<term>Light pulse</term>
<term>Light pulse experiments</term>
<term>Light pulses</term>
<term>Lower part</term>
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<term>Maize cat2</term>
<term>Maize cat3 catalase gene</term>
<term>Maize plants</term>
<term>Maize seedlings</term>
<term>Maximal cat2 transcript level</term>
<term>Mrna</term>
<term>Nicotiana</term>
<term>Nicotiana plumbaginifolia</term>
<term>Northern blots</term>
<term>Oxidative</term>
<term>Oxidative damage</term>
<term>Photooxidative stress</term>
<term>Photoperiod</term>
<term>Photoreactivation</term>
<term>Photoreceptor</term>
<term>Physiol</term>
<term>Plant cell</term>
<term>Plant physiol</term>
<term>Possible involvement</term>
<term>Scandalios</term>
<term>Seedling</term>
<term>Similar expression pattern</term>
<term>Striped bars</term>
<term>Strong induction</term>
<term>Time leaf samples</term>
<term>UV-light</term>
<term>Visible light</term>
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<term>Boca raton</term>
<term>Boldt</term>
<term>Carolina state university</term>
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<term>Cat2</term>
<term>Cat2 expression</term>
<term>Cat2 gene</term>
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<term>Cat2 mrna accumulation</term>
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<term>Cat3 catalase gene</term>
<term>Cat3 catalase genes</term>
<term>Cat3 circadian expression</term>
<term>Cat3 circadian rhythm</term>
<term>Cat3 gene</term>
<term>Cat3 genes</term>
<term>Cat3 mrna accumulation</term>
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<term>Circadian regulation</term>
<term>Circadian rhythm</term>
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<term>Continuous darkness</term>
<term>Continuous light</term>
<term>Cyclic light signal</term>
<term>Dark control</term>
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<term>Distinct response</term>
<term>Etiolated maize seedlings</term>
<term>Full spectrum light pulse</term>
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<term>Genetics</term>
<term>Hybridization signals</term>
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<term>Time leaf samples</term>
<term>Visible light</term>
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<front><div type="abstract" xml:lang="en">Abstract: The effects of UV (ultraviolet)-irradiation on the expression of the antioxidant genes Cat2 and Cat3, encoding the CAT-2 and CAT-3 catalases in maize were examined. Cat2 and Cat3 transcript accumulation was analyzed in leaves of maize seedlings grown under different light conditions, and subsequently exposed to UV-light. Under DD-(constant darkness) and LL- (continuous light) conditions, as well as under a 12h D/L- (dark/light) photoperiod, the Cat2 mRNA was expressed at low and constant levels. In contrast, Cat3 transcript accumulation was constant and about 10 times higher than that of Cat2 under DD or LL, while the expression of Cat3 exhibits a typical circadian rhythm under a 12h D/L photoperiod. UV-light pulses in the range of 290 to 400 nm strongly induce the expression of Cat2. Upon removing the UV-B portion (290–310 nm) of the UV-spectrum the maximal Cat2 transcript level was reduced by about 60%. On applying UV-light of the same quality in addition to visible light, the expression of Cat2 was induced. DNA damage caused by UV-light and induction mediated by a UV-light photosensory system are suggested. Further, it is suggested that the Cat3 circadian rhythm may be regulated by a blue light/UV-A and a UV-B photoreceptor. If DD and LL grown plants that exhibit no circadian oscillation, were exposed to constant UV-light in the range of 290 to 400 nm a circadian rhythm was induced; indicating that UV-light may function as an additional environmental cue to entrain the Cat3 circadian rhythm. Since, Cat2 and Cat3 showed distinct responses to UV light, it is suggested that both genes may act to scavenge reactive oxygen species (ROS) generated by UV-light to protect the plant from oxidative damage.</div>
</front>
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Influence of UV-Light on the Expression of the Cat2 and Cat3 Catalase Genes in Maize

Influence of UV-Light on the Expression of the Cat2 and Cat3 Catalase Genes in Maize

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri