Plant Mutation
Mostrando 13-24 de 602 artigos, teses e dissertações.
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13. Mutation in the xpsD gene of Xanthomonas axonopodis pv. citri affects cellulose degradation and virulence
The Gram-negative bacterium Xanthomonas axonopodis pv. citri, the causal agent of citrus canker, is a major threat to the citrus industry worldwide. Although this is a leaf spot pathogen, it bears genes highly related to degradation of plant cell walls, which are typically found in plant pathogens that cause symptoms of tissue maceration. Little is known on
Genetics and Molecular Biology. Publicado em: 18/12/2009
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14. Modulatory effects of Tabebuia impetiginosa (Lamiales, Bignoniaceae) on doxorubicin-induced somatic mutation and recombination in Drosophila melanogaster
The wing Somatic Mutation and Recombination Test (SMART) in D. melanogaster was used to study genotoxicity of the medicinal plant Tabebuia impetiginosa. Lapachol (naphthoquinone) and β-lapachone (quinone) are the two main chemical constituents of T. impetiginosa. These compounds have several biological properties. They induce apoptosis by generating oxygen-
Genetics and Molecular Biology. Publicado em: 01/05/2009
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15. Controle do desenvolvimento vegetal pela interação auxina-citocinina. Uma nova abordagem baseada no estudo de mutantes de tomateiro (Solanun lycopersicum cv Micro-Tom) / Control of plant development by auxin-cytokinin interactions. A new approach based on tomato (Solanum lycopersicum cv Micro-Tom) mutants.
The plant hormones auxin and cytokinin are crucial for plant development, since they control cell division, expansion and differentiation, which regulate developmental processes starting from embryo formation to fruit ripening and senescence. Auxins and cytokinins usually regulate the same physiological responses, suggesting multiple mechanisms of interactio
Publicado em: 2009
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16. Caracterização de dois cDNAs homológos e uma AP endonuclease em cana-de-açúcar
The genome of all organisms is subject to injuries that can be caused by endogenous and environmental factors. If these lesions are not corrected, it can be fixed generating a mutation which can be lethal to the organisms. In order to prevent this, there are different DNA repair mechanisms. These mechanisms are well known in bacteria, yeast, human, but not i
Publicado em: 2009
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17. Biological and molecular characterization of begomoviruses in soybean (Glycine max) and Euphorbia heterophylla, and RNA interference-mediated virus resistance in transgenic soybean plants / Caracterização molecular e biológica de begomovírus de soja (Glycine max) e leiteiro (Euphorbia heterophylla) e resistência a vírus mediada por RNA interferente em plantas transgênicas de soja
Molecular characterization of begomoviruses is of fundamental importance to identify the mechanisms of genetic variability of these important plant pathogens. Genome analysis allows for an understanding of mutation and recombination mechanisms which lead to evolution of new viral species. In Brazil, only a few reports of begomovirus infection of soybean have
Publicado em: 2009
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18. Expressão de genes de resposta a estresses ambientais em mutantes defectivos de milho e Arabidopsis
Reverse genetics and gene expression analysis has been the main approach adopted in order to carry out the functional characterization of genes. Results from such studies have typically demonstrated that same gene can be involved in different cell functions. In this context, analysis of trehalose metabolism in plants has revealed that this pathway plays an i
Publicado em: 2008
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19. Caracterização funcional de uma xiloglucano galactosiltransferase de Eucalyptus grandis e uma ramnose sintase de Arabidopsis thaliana: Efeitos sobre a estrutura e composição da parede celular primária / Functional characterization of a xyloglucan galactosyltransferase of Eucalyptus grandis and a rhamnose synthase of Arabidopsis thaliana: Effects upon the structure and composition of the primary cell wall
The plant cell wall has been associated with several important biological functions. It surrounds the plant, protecting it against mechanical injuries, biotic and abiotic stresses. In addition, plant cell walls determine cell shape and growth rates. The main constituents of plant cell walls are: cellulose, hemicellulose, pectine, lignin and proteins, which v
Publicado em: 2008
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20. Mutagênese induzida por flavonóides presentes do decocto das cascas da aroeira (Schinus terebinthifolius, Raddi)
The decoction of Brazilian pepper tree barks (Schinus terebinthifolius, Raddi), is used in medicine as wound healing and antiinflamatory. Once extracts from this plant are used for acceleration of scars process, it is important to study their mutagenic and genotoxic potential. In previous works in our laboratory, it was observed mutagenicity caused by the de
Publicado em: 2008
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21. Estudos sobre o duplo direcionamento de proteínas de plantas / Studies on the dual targeting of plant proteins
Compartimentalization of the metabolic processes in organelles, each one having a characteristic protein pool and distinct functions, is a property of eukaryote cells. A highly specific cellular system directs proteins, which are synthesized in the cytosol, to the proper organelles. However, due to functional overlaps between organelles, a given protein may
Publicado em: 2008
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22. Investigação das atividades mutagênica, antimutagênica e antioxidante de extratos etanólicos de Aiouea trinervis, Nectandra cissiflora, Ocotea minarum (Lauraceae) e dos alcalóides triptofol, ocoteína e dicentrina
The Brazilian cerrado (tropical American savanna) is a semi-arid region in which plants are submitted to metabolic stress that triggers defense mechanisms when confronted with unfavorable environmental conditions. The Lauraceae is an economically important family with 52 genera and approximately 2500-2750 species consisting mostly of trees or tree-like shrub
Publicado em: 2008
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23. Genética molecular de populações de Alternaria solani no Brasil / Molecular population genetics of Alternaria solani in Brazil
The analysis of the genetic structure of the population of Alternaria solani is an important component of the molecular epidemiology potato (Po) and tomato (To) early blight. Isolates were sampled from the Northeast, Central-West, Southeast, and South regions of Brazil. AFLP and RAPD markers were used to estimate genetic diversity. A multilocus combined data
Publicado em: 2008
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24. Controle hormonal do crescimento de raízes de tomateiro (Lycopersicon esculentum cv. Micro-Tom) em condições de déficit hídrico / Hormonal control of root growth of micro - tomato (Lycopersicon esculentum cv. micro-tom) under water deficit condition
A deficencia hídrica é o principal fator de estresse para o crescimento vegetal. Dentre os mecanismos de resistência à seca tem-se a resposta de crescimento radicular sob condições de déficit hídrico. Esta resposta assume-se ser regulada por hormônios vegetais. Uma abordagem interessante para o estudo de processos regulados por hormônios é a utili
Publicado em: 2006