Cycle Ascorbate Glutathione
Mostrando 1-12 de 19 artigos, teses e dissertações.
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1. Modificações morfológicas e metabólicas em gramínea e leguminosa forrageiras tropicais relativas ao suprimento de enxofre / Metabolic and morphological changes in grass and legume tropical forages related to sulfur supply
O enxofre é um dos elementos essenciais para as plantas e as exigências nutricionais nesse nutriente variam com a espécie e a taxa de crescimento das plantas. Com o objetivo geral de avaliar o efeito da nutrição em enxofre no crescimento e no metabolismo do capimtanzânia (Panicum maximum cv. Tanzânia) e do estilosante (Stylosanthes guianensis cv. Mine
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 12/12/2012
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2. Plant responses to stresses: role of ascorbate peroxidase in the antioxidant protection
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 peroxid
Genet. Mol. Biol.. Publicado em: 2012
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3. Heavy metals, Co, Ni, Cu, Zn and Cd, produce oxidative damage and evoke differential antioxidant responses in spinach
Exposure of 10-d-old spinach (Spinacea oleracea L.) plants to excess (500 µM) concentrations of Co, Ni, Cu, Zn and Cd in sand culture inhibited growth, induced toxicity symptoms, oxidative damage and changes in the antioxidant defense system. The severity of the metal-induced effects varied with the metals and the duration of exposure to excess supply of th
Brazilian Journal of Plant Physiology. Publicado em: 2009
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4. Flavins promote changes in the extracellular matrix, signal transduction, antioxidant enzymes and metalloproteinases during osteoblast differentiation / Flavinas promovem mudanças na matriz extracelular, vias de transdução de sinal, enzimas antioxidantes e metaloproteinases durante a diferenciação de osteoblastos
Riboflavin (Rb-Vitamin B2) is the precursor of essential flavocoenzymes, flavin mononucleotide (FMN) and flavin adenine dinucleotide (FAD). These coenzymes participate in numerous enzymatic processes dependent on electron transfer reactions that occur in energyproducing, biosynthetic, and detoxifying and electron-scavenging pathways. Increase dietary ribofla
Publicado em: 2009
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5. CaracterizaÃÃo fisica, fisico-quÃmica e enzimÃtica de frutos de seis cultivares de coqueiro anÃo em diferentes estadios de desenvolvimento / Phisical phisic-chemical, and enzimatic characterization of fruits of six dwarf coconut cultivars at different stages of development
This study aimed at characterizing in fruit and physico-chemical, and sensory enzyme in the coconut water the of six dwarf coconut cultivars at seven stages of development. The studied cultivars were: Green dwarf from Jequi (GDJ), yellow dwarf from Gramame (YDG), yellow dwarf from Malaysia (YDM), Red dwarf from Cameroon (YDC), Red dwarf from Malaysia (RDM),
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/02/2008
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6. Effect of calcium on enzymes of antioxidant system in maize (Zea mays L.) âSaracuraâ â BRS-4154 plantlets submitted to how oxygen availability / Efeito do cÃlcio em enzimas do sistema antioxidante em plÃntulas do milho (Zea Mays L.) âSaracuraâ â BRS-4154 submetidas à baixa disponibilidade de oxigÃnio
The present work aimed to verify the influence of calcium in the ADH and antioxidant system enzymes, like SOD, CAT, APX and GR, in maize seedlings "Saracura" during the period of low availability of oxygen and the onset of pos-stress recovery. In this research there were used maize plantlets, âSaracuraâ (BRS-4154), cycle 17. The germination was made in ger
Publicado em: 2006
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7. Multigene families encode the major enzymes of antioxidant metabolism in Eucalyptus grandis L
Antioxidant metabolism protects cells from oxidative damage caused by reactive oxygen species (ROS). In plants, several enzymes act jointly to maintain redox homeostasis. Moreover, isoform diversity contributes to the fine tuning necessary for plant responses to both exogenous and endogenous signals influencing antioxidant metabolism. This study aimed to pro
Genetics and Molecular Biology. Publicado em: 2005
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8. Evidence for the Presence of the Ascorbate-Glutathione Cycle in Mitochondria and Peroxisomes of Pea Leaves.
The presence of the enzymes of the ascorbate-glutathione cycle was investigated in mitochondria and peroxisomes purified from pea (Pisum sativum L.) leaves. All four enzymes, ascorbate peroxidase (APX; EC 1.11.1.11), monodehydroascorbate reductase (EC 1.6.5.4), dehydroascorbate reductase (EC 1.8.5.1), and glutathione reductase (EC 1.6.4.2), were present in m
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9. Re-Aeration following Hypoxia or Anoxia Leads to Activation of the Antioxidative Defense System in Roots of Wheat Seedlings1
The response of the ascorbate-glutathione cycle was investigated in roots of young wheat (Triticum aestivum L.) seedlings that were deprived of oxygen either by subjecting them to root hypoxia or to entire plant anoxia and then re-aerated. Although higher total levels of ascorbate and glutathione were observed under hypoxia, only the total amount of as
American Society of Plant Physiologists.
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10. Role of the Ascorbate-Glutathione Cycle of Mitochondria and Peroxisomes in the Senescence of Pea Leaves1
We investigated the relationship between H2O2 metabolism and the senescence process using soluble fractions, mitochondria, and peroxisomes from senescent pea (Pisum sativum L.) leaves. After 11 d of senescence the activities of Mn-superoxide dismutase, dehydroascorbate reductase (DHAR), and glutathione reductase (GR) present in the matrix, and ascorbat
American Society of Plant Physiologists.
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11. Ultraviolet-B- and ozone-induced biochemical changes in antioxidant enzymes of Arabidopsis thaliana.
Earlier studies with Arabidopsis thaliana exposed to ultraviolet B (UV-B) and ozone (O3) have indicated the differential responses of superoxide dismutase and glutathione reductase. In this study, we have investigated whether A. thaliana genotype Landsberg erecta and its flavonoid-deficient mutant transparent testa (tt5) is capable of metabolizing UV-B- and
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12. Dehydroascorbate Influences the Plant Cell Cycle through a Glutathione-Independent Reduction Mechanism
Glutathione is generally accepted as the principal electron donor for dehydroascorbate (DHA) reduction. Moreover, both glutathione and DHA affect cell cycle progression in plant cells. But other mechanisms for DHA reduction have been proposed. To investigate the connection between DHA and glutathione, we have evaluated cellular ascorbate and glutathione conc
American Society of Plant Biologists.