Phytoalexin
Mostrando 1-12 de 122 artigos, teses e dissertações.
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1. Fungos, micotoxinas e fitoalexina em variedades de amendoim do plantio ao armazenamento. / Fungi, mycotoxins phytoalexin in peanut varieties, during plant growth from the field to storage.
O trabalho avaliou micobiota, contaminação por aflatoxinas (AFB), ácido ciclopiazônico (ACP) e fitoalexina (trans-resveratrol) nas variedades de amendoim Runner IAC 886 e IAC-Caiapó, no campo e armazenamento. Nas amostras de campo, na IAC 886 predominou Fusarium spp. nos grãos e cascas, contaminação por AFB em 30% dos grãos, ACP em 70% e trans-resve
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 07/12/2010
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2. STUDY OF RADIOPROTECTIVE EFFECT OF THE RESVERATROL / Estudo do efeito radioprotetor do resveratrol
Resveratrol (3,4,5 trihydroxystilbene), a phenolic phytoalexin occurring naturally in a wide variety of plants, such as grapevines, in response to injury as fungal infections and exposure to ultraviolet light. In the wines this compound is present at high levels and is considered one of the higest antioxidant constituents. This high capacity to scavenge the
Publicado em: 2009
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3. INDUÇÃO PÓS-COLHEITA DA SÍNTESE DE RESVERATROL E DE RESISTÊNCIA DE FRUTOS A PODRIDÕES / POST-HARVEST INDUCTION OF RESVERATROL SYNTHESIS AND ROTTING CONTROL IN FRUITS
Os objetivos deste trabalho foram alcançados em duas etapas. Na primeira etapa, o objetivo foi avaliar a presença de trans-resveratrol em frutos de clima temperado e a sua variação de concentração nesses frutos durante o período de armazenamento, assim como a evolução dos polifenóis totais e antocianinas totais. Avaliou-se o conteúdo de polifenói
Publicado em: 2008
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4. Effect of cyanobacteria and eukaryotic algae on the resistance of tobacco plants against Tobacco mosaic virus / Efeito de cianobactérias e algas eucarióticas na resistência de plantas de fumo contra o Tobacco mosaic virus (TMV)
Algae produce several different compounds that show biological activity, including ones with antiviral activity or that act as phytoalexin inducers. Thus, it was investigated the reduction of Tobacco mosaic virus (TMV) symptoms on tobacco plants treated with cyanobacteria or eukaryotic algae, and it was studied the way of action of algae on the studied patho
Publicado em: 2006
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5. Efeito de Saccharomyces cerevisiae na síntese de fitoalexinas em sorgo, na germinação e formação de apressórios por fungos fitopatogênicos e na proteção de pepino a Colletotrichum lagenarium e sorgo a Colletotrichum sublineolum. / Effect of Saccharomyces cerevisiae in phytoalexin synthesis in sorghum, on germination and appressorium formation by plant pathogenic fungi and in the protection of cucumber against Colletotrichum lagenarium and sorghum against Colletotrichum sublineolum.
The yeast Saccharomyces cerevisiae has potential in the control of diseases in some plants by the ability to induce resistance and elicits defence mechanisms. However, in the process of purification of elicitor (s) present in the cell wall of S. cerevisiae a low efficiency was observed during the process, making difficult to carry out experiments, mainly in
Publicado em: 2005
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6. Atividade indutora de fitoalexinas e produção de substancias fungitoxicas durante a germinação de sementes de Sesbania marginata Benth
Sesbania marginata Benth is a tropical legume that stores galactomannan in its thickened endospermic cell walls. These polysaccharides are composed of a linear backbone of 13-1,4- linked D-mannose residues to which D-galactose residues are attached by a-1,6 linkages. Following germination, the galactomannan is completely broken down producing considerable am
Publicado em: 2002
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7. Produção de flavonoides e atividade oxido nitrico sintase na resposta de defesa de soja ao fungo causador do cancro da haste
The formation of phytoalexin is part of the defense mechanism of soybeans against the fungus Diaporthe phaseolorum f. sp. meridionalis (Dpm), the causal agent of stem canker disease. In this work, the involvement of nitric oxide synthase (NOS) in phytoalexin production was examined. Phytoalexin formation and NOS activity in soybean cotyledons stimulated with
Publicado em: 2001
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8. Increased susceptibility and reduced phytoalexin accumulation in drought-stressed peanut kernels challenged with Aspergillus flavus.
Three genotypes of peanut (Arachis hypogaea L.), with ICG numbers 221, 1104, and 1326, were grown in three replicate plots and drought stressed during the last 58 days before harvest by withholding irrigation water. Within each plot there were eight levels of stress ranging from 1.1 to 25.9 cm of water. Kernels harvested from the plots were hydrated to 20% m
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9. Elicitor-stimulated ion fluxes and O2− from the oxidative burst are essential components in triggering defense gene activation and phytoalexin synthesis in parsley
Fungal elicitor stimulates a multicomponent defense response in cultured parsley cells (Petroselinum crispum). Early elements of this receptor-mediated response are ion fluxes across the plasma membrane and the production of reactive oxygen species (ROS), sequentially followed by defense gene activation and phytoalexin accumulation. Omission of Ca2+ from the
The National Academy of Sciences of the USA.
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10. Involvement of 3-Hydroxy-3-Methylglutaryl Coenzyme A Reductase in the Regulation of Sesquiterpenoid Phytoalexin Synthesis in Potato 1
The importance of 3-hydroxy-3-methylglutaryl coenzyme A reductase (HMG-CoA reductase) in the regulation of sesquiterpenoid phytoalexin accumulation in potato (Solanum tuberosum L. cv Kennebec) was examined. Wounding of potato tubers produced a large temporary increase in HMG-CoA reductase activity of the microsomal and organelle fractions. Treatment of wound
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11. Isolation of phytoalexin-deficient mutants of Arabidopsis thaliana and characterization of their interactions with bacterial pathogens.
A genetic approach was used to assess the extent to which a particular plant defense response, phytoalexin biosynthesis, contributes to Arabidopsis thaliana resistance to Pseudomonas syringae pathogens. The A. thaliana phytoalexin, camalexin, accumulated in response to infection by various P. syringae strains. No correlation between pathogen avirulence and c
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12. Co-ordinated synthesis of phytoalexin biosynthetic enzymes in biologically-stressed cells of bean (Phaseolus vulgaris L.)
Changes in the rates of synthesis of three enzymes of phenyl-propanoid biosynthesis in Phaseolus vulgaris L. (dwarf French bean) have been investigated by immunoprecipitation of [35S]methionine-labeled enzyme subunits with mono-specific antisera. Elicitor causes marked, rapid but transient co-ordinated increases in the rate of synthesis of phenyl-alanine amm