Consulta: creatorFacets:"Caverzan,Andréia"
Registros recuperados: 4
Data/hora: 19/05/2024 09:30:20

Antioxidant responses of wheat plants under stress
Provedor de dados: Genetics and Molecular Biology
Autores: Caverzan,Andréia; Casassola,Alice; Brammer,Sandra Patussi.
Abstract Currently, food security depends on the increased production of cereals such as wheat (Triticum aestivum L.), which is an important source of calories and protein for humans. However, cells of the crop have suffered from the accumulation of reactive oxygen species (ROS), which can cause severe oxidative damage to the plants, due to environmental stresses. ROS are toxic molecules found in various subcellular compartments. The equilibrium between the production and detoxification of ROS is sustained by enzymatic and nonenzymatic antioxidants. In the present review, we offer a brief summary of antioxidant defense and hydrogen peroxide (H2O2) signaling in wheat plants. Wheat plants increase antioxidant defense mechanisms under abiotic stresses, such...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Abiotic stress; Antioxidant enzymes; Hydrogen peroxide signaling; Wheat; Triticum aestivum.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572016000100001

Gene stacking as a strategy to confer characteristics of agronomic importance in plants by genetic engineering
Provedor de dados: Ciência Rural
Autores: Ceccon,Cássia Canzi; Caverzan,Andréia; Margis,Rogerio; Salvadori,José Roberto; Grando,Magali Ferrari.
ABSTRACT: Gene stacking refers to the introduction of two or more transgenes of agronomic interest in the same plant. The main methods for genetically engineering plants with gene stacking involve (i) the simultaneous introduction, by the co-transformation process, and (ii) the sequential introduction of genes using the re-transformation processes or the sexual crossing between separate transgenic events. In general, the choice of the best method varies according to the species of interest and the availability of genetic constructions and preexisting transgenic events. We also present here the use of minichromosome technology as a potential future gene stacking technology. The purpose of this review was to discuss aspects related to the methodology for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Co-transformation; Re-transformation; Sexual crossing; Transgene; Minichromosomes.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782020000600401

Oxidative stress and differential antioxidant enzyme activity in glyphosate-resistant and -sensitive hairy fleabane in response to glyphosate treatment
Provedor de dados: Bragantia
Autores: Piasecki,Cristiano; Carvalho,Ivan Ricardo; Cechin,Joanei; Goulart,Francisco A. P; Maia,Luciano Carlos da; Agostinetto,Dirceu; Caverzan,Andréia; Stewart Jr.,C. Neal; Vargas,Leandro.
ABSTRACT Biochemical assays in a time-course were employed to evaluate stresses induced by glyphosate treatment in resistant and sensitive biotypes of Conyza bonariensis. Two experiments were conducted assessing glyphosate doses and time-course after treatment. The doses of glyphosate ranged from 0 to 11840 g ae·ha–1 and assessments performed until 552 h after glyphosate treatment (HAT). The objectives of this study were to evaluate the oxidative stress and differential antioxidant enzyme activity in glyphosate-resistant and -sensitive biotypes of hairy fleabane after glyphosate treatment. After treatment, both studied biotypes accumulated similar levels of shikimic-acid until 96 h. The sensitive biotype died at192 HAT. Shikimic-acid and hydrogen peroxide...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Conyza bonariensis; Lipid peroxidation; Shikimic-acid; Herbicide resistance.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052019000300379

Plant responses to stresses: role of ascorbate peroxidase in the antioxidant protection
Provedor de dados: Genetics and Molecular Biology
Autores: Caverzan,Andréia; Passaia,Gisele; Rosa,Silvia Barcellos; Ribeiro,Carolina Werner; Lazzarotto,Fernanda; Margis-Pinheiro,Márcia.
When plants are exposed to stressful environmental conditions, the production of Reactive Oxygen Species (ROS) increases and can cause significant damage to the cells. Antioxidant defenses, which can detoxify ROS, are present in plants. A major hydrogen peroxide detoxifying system in plant cells is the ascorbate-glutathione cycle, in which, ascorbate peroxidase (APX) enzymes play a key role catalyzing the conversion of H2O2 into H2O, using ascorbate as a specific electron donor. Different APX isoforms are present in distinct subcellular compartments, such as chloroplasts, mitochondria, peroxisome, and cytosol. The expression of APX genes is regulated in response to biotic and abiotic stresses as well as during plant development. The APX responses are...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ascorbate peroxidase; Antioxidant system; Reactive oxygen species; Abiotic stress; Mutant plants.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572012000600016