Influence of a Brassinosteroid Analogue on Antioxidant Enzymes in Rice Grown in Culture Medium with NaCl

Núñez, Miriam; Mazzafera, Paulo; Mazorra, L. M.; Siqueira, Walter José; Zullo, Marco António Teixeira

doi:10.1023/a:1027380831429

Cited by 140 publications

(51 citation statements)

References 16 publications

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“…Li et al (1998) observed that application of brassinolide to water stressed maize seedlings increased the activities of enzymatic and non-enzymatic antioxidants, whereas Vardhini and Rao (2003) showed that during osmotic stress BRs increase the activity of CAT and decrease the peroxidase and AsA oxidase activities in sorghum. Increase in anti-oxidative enzymes by BRs has also been reported in salt stressed rice seedlings (Núñez et al 2003) and cadmium stressed chickpea (Hasan et al 2008). Hayat et al (2007) have also reported that BRs increase anti-oxidative activities and photosynthesis in mustard plants under cadmium stress.…”

Section: Brassinosteroids (Brs)mentioning

confidence: 67%

Mechanism of Free Radical Scavenging and Role of Phytohormones in Plants Under Abiotic Stresses

Ahmad

Umar

Sharma

2010

Plant Adaptation and Phytoremediation

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Environmental stresses result in the generation of reactive oxygen species (ROS) in plants. ROS accumulate in cells and lead to the oxidation of proteins, chlorophyll, lipids, nucleic acids, carbohydrates etc. Cells have evolved intricate defense systems including enzymatic (superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX), glutathione reductases (GR), monodehydroascorbate reductases (MSHAR), dehydroascorbate reductases (DHAR), glutathione peroxidase (GPX), guaicol peroxidase (GOPX) and glutathione-S-transferase (GST) and non-enzymatic systems such as ascorbic acid (ASH), glutathione (GSH), phenolic compounds, alkaloids, non-protein amino acids and α-tocopherol, which can scavenge the indigenously generated ROS. Plant stress tolerance mediated by antioxidants has been shown by many workers. Antioxidant resistance mechanisms may provide a strategy to enhance plant stress tolerance. Various enzymes involved in ROS-scavenging have been manipulated, over-expressed or down-regulated to add to the present knowledge and understanding of the role of antioxidant system. ROS induce the synthesis of several plant hormones, such as ethylene, salicylic acid (SA), jasmonic acid, brassinosteroids, abscisic acid (ABA) etc. These Phytohormones are required for growth and development of plants and defense responses during environmental stresses. The present review throws light on the enzymatic and non-enzymatic antioxidants in plants to enhance stress tolerance in plants and also in particular the role of brassinosteroids and ethylene during abiotic stress tolerance in plants.

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Section: Brassinosteroids (Brs)mentioning

confidence: 67%

Mechanism of Free Radical Scavenging and Role of Phytohormones in Plants Under Abiotic Stresses

Ahmad

Umar

Sharma

2010

Plant Adaptation and Phytoremediation

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“…Brassinoesteróides também são conhecidos por proteger plantas contra estresses hídrico e salino, alterando a expressão de vários genes (Zullo & Adam, 2002;Nuñez et al, 2003Nuñez et al, /2004Choe, 2006).…”

Section: Resultsunclassified

Indução de metabólitos secundários em plântulas de Hypericum brasiliense Choisy crescendo in vitro

2009

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A produção de rutina, quercetina, 1,5-diidroxixantona e ácido betulínico foi investigada em plântulas de H. brasiliense crescendo in vitro, sob a influência de ácido salicílico, polietilenoglicol, NaCl, 24-epibrassinolídeo, benzotiadiazole (BION), metiljasmonato e concentrações aumentadas de boro e nitrogênio no meio líquido de cultura. As avaliações foram feitas após 5 e 10 dias do início dos tratamentos. Os maiores aumentos de conteúdo foram observados com quercetina para boro e ácido salicílico aos 5 dias, e 24-epibrassinolídeo e BION aos 10 dias. PALAVRAS-CHAVE:Ácido betulínico, Quercetina, Rutina, Xantona. Induction of secondary metabolites in plantlets of Hypericum brasiliense Choisy in vitro ABSTRACTThe production of rutin, quercetin, 1,5-dihydroxyxanthone and betulinic acid was investigated in plantlets of H. brasieliense in vitro, and exposed to salycilic acid, poliethylene glycol, NaCl, 24-epibrassinolide, benzothiadiazole (BION), methyljasmonate and increased concentrations of boron and nitrogen in the liquid culture medium. Evaluations of the contents were carried out after 5 and 10 days of treatments. The highest increase was observed in quercetin in the salycilic acid and B treatments after 5 days of exposure, and in 24-epibrassinolide and BION after 10 days.

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“…Generation of reactive oxygen species (ROS) lead to lipid peroxidation (Chen et al 2000, Sreenivasulu et al 1999) protein degradation (Jiang and Zhang 2001) and nucleic acid damages (Hagar et al 1996). To prevent or alleviate injuries from ROS, plants have evolved an antioxidant defence system that includes non-enzymic compounds like ascorbate, gluthatione, tocopherol, carotenoids, flavonoids and enzymes such as superoxide dismutase (SOD), catalase (CAT), peroxidase (POX), ascorbate peroxidase (APX), gluthatione reductase (GR) and polyphenol oxidase (PPO) (Agarwal and Pandey 2004, Núñez et al 2003/4, Sergi and Alegre 2003. Co-operation among these enzymes is essential for the effective protection from ROS (Scebba et al 1998).…”

Section: Introductionmentioning

confidence: 99%

Effect of drought on biomass, protein content, lipid peroxidation and antioxidant enzymes in two sesame cultivars

2007

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The effects of drought on growth, protein content, lipid peroxidation, superoxide dismutase (SOD), peroxidase (POX), catalase (CAT) and polyphenol oxidase (PPO) were studied in leaves and roots of Sesamum indicum L. cvs. Darab 14 and Yekta. Four weeks after sowing, plants were grown under soil moisture corresponding to 100, 75, 50 and 25 % field capacity for next four weeks. Fresh and dry masses, and total protein content in leaves and roots decreased obviously under drought. However, several new proteins appeared and content of some proteins was affected. Measurement of malondialdehyde content in leaves and roots showed that lipid peroxidation was lower in Yekta than in Darab 14. Severe stress increased SOD, POX, CAT and PPO activities in leaves and roots, especially in Yekta. According to the present study Yekta is more resistant to drought than Darab 14.Additional key words: catalase, malondialdehyde, peroxidase, polyphenol oxidase, Sesamum indicum, superoxide dismutase.

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Influence of a Brassinosteroid Analogue on Antioxidant Enzymes in Rice Grown in Culture Medium with NaCl

Cited by 140 publications

References 16 publications

Mechanism of Free Radical Scavenging and Role of Phytohormones in Plants Under Abiotic Stresses

Mechanism of Free Radical Scavenging and Role of Phytohormones in Plants Under Abiotic Stresses

Indução de metabólitos secundários em plântulas de Hypericum brasiliense Choisy crescendo in vitro

Effect of drought on biomass, protein content, lipid peroxidation and antioxidant enzymes in two sesame cultivars

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