Phytochelatins
Mostrando 1-12 de 42 artigos, teses e dissertações.
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1. A FACTORIAL DESIGN APPLIED TO THE STUDY OF CHROMIUM TOXICITY ON THE GLUTATHIONE LEVELS OF Brachiaria brizantha AND Brachiaria ruziziensis SEEDLINGS
Chromium toxicity affects redox reactions within plant cells, generating detrimental reactive oxygen species. Glutathione is an antioxidant peptide and also a substrate for the production of phytochelatins, which are chelating peptides reported to mitigate Cr3+ toxicity in plants. In this study, Brachiaria brizantha (B. brizantha) and Brachiaria ruziziensis
Quím. Nova. Publicado em: 2015-08
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2. Toxic effects of cadmium on the microalgae Lingulodinium polyedrum using high performance liquid chromatography coupled to mass spectrometry (LC-MS/MS) / Análise dos efeitos tóxicos de cádmio sobre a microalga Lingulodinium polyedrum utilizando cromatografia líquida de alta eficiência acoplada à espectrometria de massas (LC-MS/MS)
Given the increase of environmentally harmful human activities, in particular the ones injurious to the aquatic environment, it is important to elucidate the defense mechanisms utilized by organisms exposed to damaging agents. Those species can later be suggested to be used as pollution bioindicators or bioremediatiors. Algae are of particular importance bec
Publicado em: 2010
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3. Análise da resposta antioxidativa de células de Nicotiana tabacum cv BY-2 submetidas ao cádmio. / Antioxidant response of by-2 Nicotiana tabacum cells to cadmium stress.
The contamination of environments by heavy metal pollution, mainly by cádmium (Cd), considered one of the more toxic, is generated by mining and industrial activities, and sewage sludge and phosphated fertilizers used in agriculture. The latter contains Cd in its composition and with continuous agricultural utilization an increase in the heavy metals levels
Publicado em: 2004
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4. Increased Zinc Tolerance in Silene vulgaris (Moench) Garcke Is Not Due to Increased Production of Phytochelatins.
The concentration of acid-soluble thiols other than reduced glutathione (SH - GSH) increases in the roots of zinc-sensitive and zinc-tolerant Silene vulgaris (Moench) Garcke after exposure to zinc for 1 to 3 d. The concentration of SH - GSH in the roots is higher in the sensitive plants than in the tolerant ones, both at equal external zinc concentrations an
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5. Phytochelatins, a class of heavy-metal-binding peptides from plants, are functionally analogous to metallothioneins
Phytochelatins are a class of heavy-metal-binding peptides previously isolated from cell suspension cultures of several dicotyledonous and monocotyledonous plants. These peptides consist of repetitive γ-glutamylcysteine units with a carboxyl-terminal glycine and range from 5 to 17 amino acids in length. In the present paper we show that all plants tested sy
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6. Phytochelatins Are Involved in Differential Arsenate Tolerance in Holcus lanatus1
Arsenate tolerance is conferred by suppression of the high-affinity phosphate/arsenate uptake system, which greatly reduces arsenate influx in a number of higher plant species. Despite this suppressed uptake, arsenate-tolerant plants can still accumulate high levels of As over their lifetime, suggesting that constitutive detoxification mechanisms may be requ
American Society of Plant Physiologists.
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7. Cadmium-Responsive Thiols in the Ectomycorrhizal Fungus Paxillus involutus
Molecular and cellular mechanisms underlying the sustained metal tolerance of ectomycorrhizal fungi are largely unknown. Some of the main mechanisms involved in metal detoxification appear to involve the chelation of metal ions in the cytosol with thiol-containing compounds, such as glutathione, phytochelatins, or metallothioneins. We used an improved high-p
American Society for Microbiology.
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8. Homo-Phytochelatins Are Synthesized in Response to Cadmium in Azuki Beans1
In a recent report, it was claimed that azuki beans (Vigna angularis) do not synthesize phytochelatins (PCs) upon exposure to cadmium, although glutathione (GSH), the substrate for PC synthesis, is present in this plant. This legume species thus would be the first exception in the plant kingdom that would fail to complex heavy metals by PCs. Here, we report
American Society of Plant Physiologists.
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9. MgATP-Dependent Transport of Phytochelatins Across the Tonoplast of Oat Roots.
In Cd-exposed oat (Avena sativa) roots Cd was found to be associated primarily with the phytochelatin ([gamma]-glutamylcysteinyl)3-glutamic acid [([gamma]EC)3G], with a peptide to Cd ratio of 1:3 (cysteine to Cd ratio of 1:1), even though both ([gamma]EC)2G and ([gamma]EC)3G were present in the roots. Phytochelatins are known to accumulate in the vacuoles of
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10. Hydroxymethyl-phytochelatins [(gamma-glutamylcysteine)n-serine] are metal-induced peptides of the Poaceae.
Exposure of several species of the family Poaceae to cadmium results in the formation of metal-induced peptides of the general structure (gamma-Glu-Cys)n-Ser (n=2-4). They are assumed to be formed from hydroxymethyl-glutathione (gamma-Glu-Cys-Ser) and are termed hydroxymethyl-phytochelatins (hm-PCs) in analogy to the homo-phytochelatins [(gamma-Glu-Cys)n-bet
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11. Phytochelatin Synthesis and Glutathione Levels in Response to Heavy Metals in Tomato Cells 1
Cell suspension cultures of tomato, Lycopersicon esculentum Mill. cv VFNT-Cherry, produce phytochelatins (poly[γ-glutamylcysteinyl]glycines) when exposed to cadmium. The synthesis of these peptides is accompanied by a decline in cellular levels of glutathione. Buthionine sulfoximine, an inhibitor of glutathione synthesis, inhibits the sustained production o
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12. Phytochelatins and related peptides. Structure, biosynthesis, and function.