Oxidative metabolism in tomato plants subjected to heat stress

Rivero, Rosa M.; Ruiz, Juan M.; Romero, Luís

doi:10.1080/14620316.2004.11511805

Cited by 70 publications

(43 citation statements)

References 39 publications

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“…2D) suggested that H 2 O 2 from extracellular sources is an important component in the regulation of APX2 expression. The mild heat treatment also raised foliar H 2 O 2 levels, consistent with previous reports (see Results;Dat et al, 1998;Vallelian-Bindschedler et al, 1998;Rivero et al, 2004;Larkindale and Huang, 2005) and, while its source in this case has not been investigated, other studies have suggested that the plasma membrane or the apoplast is the origin of this increase during heat stress (Larkindale and Huang, 2005;Volkov et al, 2006).…”

Section: Dismutation Of Osupporting

confidence: 80%

Impact of chloroplastic- and extracellular-sourced ROS on high light-responsive gene expression in Arabidopsis

Bechtold

Richard

Zamboni

et al. 2008

Journal of Experimental Botany

118

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The expression of 28 high light (HL)-responsive genes of Arabidopsis was analysed in response to environmental and physiological factors known to influence the expression of the HL-responsive gene, ASCOR-BATE PEROXIDASE2 (APX2). Most (81%) of the HL-responsive genes, including APX2, required photosynthetic electron transport for their expression, and were responsive to abscisic acid (ABA; 68%), strengthening the impression that these two signals are crucial in the expression of HL-responsive genes. Further, from the use of mutants altered in reactive oxygen species (ROS) metabolism, it was shown that 61% of these genes, including APX2, may be responsive to chloroplast-sourced ROS. In contrast, apoplastic/ plasma membrane-sourced H 2 O 2 , in part directed by the respiratory burst NADPH oxidases AtrbohD and AtrbohF, was shown to be important only for APX2 expression. APX2 expression in leaves is limited to bundle sheath parenchyma; however, for the other genes in this study, information on their tissue specificity of expression is sparse. An analysis of expression in petioles, enriched for bundle sheath tissue compared with distal leaf blade, in HL and control leaves showed that 25% of them had >10-fold higher expression in the petiole than in the leaf blade.However, this did not mean that these petiole expression genes followed a pattern of regulation observed for APX2.

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Section: Dismutation Of Osupporting

confidence: 80%

Impact of chloroplastic- and extracellular-sourced ROS on high light-responsive gene expression in Arabidopsis

Bechtold

Richard

Zamboni

et al. 2008

Journal of Experimental Botany

118

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“…Our results showed a significant increase in POD and CAT at 37 and 42°C and a decline for both at 47°C, showing both enzymes are venerable to heat stress. Similarly, Rivero et al (2004) proposed that the lower CAT and POD activity in tomato plants subjected to a 35°C treatment were negatively correlated with H 2 O 2 accumulation. Therefore, it can be assumed that in lily plants, the reduction in CAT and POD activities at 47°C contributes to the intensification of oxidative stress by the over-accumulation H 2 O 2 .…”

Section: Discussionmentioning

confidence: 97%

Effects of short-term heat stress on oxidative damage and responses of antioxidant system in Lilium longiflorum

2007

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“…Assim, esta enzima, a primeira a atuar no ciclo ascorbato-glutationa (Bray et al 2000), pode exercer um papel importante na defesa das plantas jovens de C. echinata contra o estresse oxidativo induzido por fatores ambientais. Resposta semelhante foi observada por Rivero et al (2004), que verificaram que essa enzima foi a única a ser estimulada em plantas de Lycopersicon esculentum L. cv. Tmknvf (2) expostas à alta temperatura, enquanto POD, catalase e glutationa redutase foram inibidas.…”

Section: Discussionunclassified

“…Certamente, alguns fatores de variação devem ser previamente conhecidos para que se tenha certeza da ativação do sistema de respostas antioxidativas em plantas que crescem em ambientes urbanos, pois se sabe que tais defesas variam não somente entre espécies, como também entre plantas da mesma espécie em diferentes estádios de desenvolvimento e entre folhas da mesma planta, em fases distintas de desenvolvimento (Klumpp et al 2000). Além disso, as espécies também respondem às variações ambientais ao longo das estações do ano (Chaitanya et al 2002, Kuk et al 2003, Lee et al 2004, Rivero et al 2004, Zhou & Zhao 2004.…”

Section: Introductionunclassified

Variação sazonal em antioxidantes em folhas de plantas jovens de Caesalpinia echinata Lam. (pau-brasil)

et al. 2005

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-(Seasonal variation in antioxidants in leaves of young plants of Caesalpinia echinata Lam. (brazilwood)). The urban environmental factors generate conditions of oxidative stress in plants. Cellular antioxidants, such as ascorbic acid (AA), thiols (Ti), peroxidases (POD) and superoxide dismutase (SOD) are induced to different levels depending on their capacity to tolerate stressing conditions. In the first part of this study we determined the profile of these defenses in leaves of different ages of young plants of C. echinata. The levels of antioxidants were similar in all leaves analyzed, independently of the age. Secondly, we evaluated the same antioxidants and glutathione (GSH) in 130 young plants kept in a greenhouse with constant monitoring of temperature, relative humidity and irradiance during 18 months, in order to establish the seasonal variations occurring in response to climatic factors. During this period, leaf antioxidants were analyzed every three months. In general, AA concentrations and POD activity in C. echinata were higher than the levels reported for other tropical tree species. Seasonal variations were observed. GSH concentration and POD activity were significantly influenced by temperature and SOD by temperature and humidity.Key words -ascorbic acid, Caesalpinia echinata, glutathione, peroxidases, superoxide dismutase, thiols RESUMO -(Variação sazonal em antioxidantes em folhas de plantas jovens de Caesalpinia echinata Lam. (pau-brasil)). O ambiente urbano pode gerar condições de estresse oxidativo nas plantas, levando à estimulação de antioxidantes como ácido ascórbico (AA), tióis (Ti), peroxidases (POD) e superóxido dismutase (SOD), em diferentes níveis, de acordo com sua capacidade de tolerar tais condições. Este estudo, em sua primeira fase, buscou conhecer o perfil destas defesas em folhas de plantas jovens de C. echinata com diferentes graus de desenvolvimento. Os níveis dos antioxidantes foram similares em todas as folhas analisadas. Em uma segunda fase, tais antioxidantes e a glutationa (GSH) foram avaliados em 130 plantas mantidas em casa de vegetação com monitoramento constante de temperatura, umidade relativa e irradiância, por um período de 18 meses, para estabelecer se variações sazonais nessas defesas ocorrem em resposta a fatores climáticos. Nesse período, os antioxidantes foliares foram analisados a cada três meses. Em geral, a concentração de AA e a atividade da POD foram altas em C. echinata, quando comparadas com as de outras espécies arbóreas tropicais. Houve variações nas defesas ao longo do tempo. A concentração de GSH e a atividade da POD mostraram ser influenciadas por mudanças na temperatura e a SOD foi estimulada em resposta à temperatura e à umidade relativa.Palavras-chave -ácido ascórbico, Caesalpinia echinata, glutationa, peroxidases, superóxido dismutase, tióis IntroduçãoA exploração descontrolada do pau-brasil (Caesalpinia echinata Lam., LeguminosaeCaesalpiniodeae), nos primeiros séculos da colonização, contribuiu significativamente para a redução de ...

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Oxidative metabolism in tomato plants subjected to heat stress

Cited by 70 publications

References 39 publications

Impact of chloroplastic- and extracellular-sourced ROS on high light-responsive gene expression in Arabidopsis

Impact of chloroplastic- and extracellular-sourced ROS on high light-responsive gene expression in Arabidopsis

Effects of short-term heat stress on oxidative damage and responses of antioxidant system in Lilium longiflorum

Variação sazonal em antioxidantes em folhas de plantas jovens de Caesalpinia echinata Lam. (pau-brasil)

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