Phytopathogenic Bacteria
Mostrando 25-36 de 101 artigos, teses e dissertações.
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25. Semiochemicals produced by phytopathogenic bacteria and Brazilian opilionids / Semioquimicos produzidos por bacterias fitopatogenicas e opiliões brasileiros
Este trabalho abordou dois tópicos relacionados à comunicação química inter e intraespecífica. O primeiro tópico descreveu a produção de sinalizadores químicos da classe das acil-homosserina lactonas (acil-HSLs) por bactérias Gram-negativas fitopatogênicas, em mecanismos comunicativos conhecidos como quorum-sensing. Foram estudadas três espécie
Publicado em: 2006
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26. Genetic diversity of Xanthomonas campestris pv. campestris in Brazil / Diversidade genética de Xanthomonas campestris pv. campestris no Brasil
Brazilian and foreign isolates of Xanthomonas campestris pv. campestris (Xcc), as well as a foreign strain of X. campestris pv. armoraciae were studied regarding their phenotipic and genotipic variability by metabolic analysis (BiologTM), fatty acids methyl ester (FAME), pulsed field gel electrophoresis (PFGE) and inoculation in differential series. Results
Publicado em: 2006
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27. Characterization of extracellular proteases produced by Xylella fastidiosa from citrus and grapevines. / Caracterização de proteases extracelulares produzidas por Xylella fastidiosa de citros e videira.
Xylella fastidiosa is a pathogenic bacterium found in several plants. These bacteria secrete extracellular proteases into the culture broth as visualized in sodium-dodecyl-sulfate polyacrylamide activity gels containing gelatin as a co-polymerized substrate. Three major protein bands were produced by strain X0 (citrus) with molar masses (MM) of 122, 84 and 6
Publicado em: 2005
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28. Antifungal activity of secondary metabolites produced by Bacillus pumilus MAIIIM4a, an endophytic from cassava. / Atividade antifúngica de metabólitos secundários produzidos pelo endófito de mandioca Bacillus pumilus MAIIIM4a.
Endophytic microorganisms are defined as organisms that inhabit the interior of a vegetable at least during a period of the vital cycle, without causing any apparent damage. In the search for new organisms and new secondary metabolites, a study was conducted to evaluate the chemical diversity of endophytic bacteria through the isolation and identification of
Publicado em: 2005
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29. Fisiologia de Bacillus subtilis R14 sob condiÃÃes restrita e irrestrita de oxigÃnio: produÃÃo de compostos bioativos e esporulaÃÃo
Several strains of Bacillus subtilis produce lipopeptides, which are amphiphilic compounds with surfactant and antimicrobial activities. Production of lipopeptide, sporulation and competence in B. subtilis are interconnected through a complex array of controlling elements. The aims of this study were to evaluate the activity of B. subtilis R14 against severa
Publicado em: 2005
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30. Survey of leafhopper (hemiptera: cicadellidae) vectors of Xylella fastidiosa in citrus groves of the north coast of Bahia state. / Levantamento de cigarrinhas (Hemiptera: Cicadellidae) vetoras de Xylella fastidiosa em pomares cítricos do litoral norte da Bahia.
This study was carried out to identify vectors or potential vectors of Xylella fastidiosa Wells et al. in citrus groves of the north coast of Bahia State, Brazil, based on a faunistic survey and determination of predominant sharpshooter leafhoppers (subfamily Cicadellinae). The survey was carried out from March/2002 to February/2003 in five old sweet orange
Publicado em: 2004
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31. Infection efficiency and multiplication of citrus [Citrus sinensis (L.) Osbeck] and coffee (Coffea arabica L.) strains of Xylella fastidiosa in cross inoculations. / Eficiência de infecção e multiplicação de estirpes de Xylella fastidiosa de citros [Citrus sinensis (L.) Osbeck] e de cafeeiro (Coffea arabica L.) em inoculações cruzadas.
O trabalho teve por objetivo avaliar a capacidade de infecção e multiplicação de estirpes de Xylella fastidiosa de citros [Citrus sinensis (L.) Osbeck] e de cafeeiro (Coffea arabica L.) em inoculações cruzadas, para investigar a possibilidade de disseminação deste patógeno de pomares cítricos infectados para cafezais ou vice versa. As inoculações
Publicado em: 2003
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32. Analysis of the intercellular fluid proteome of Xylella fastidiosa - infected citrus leaves. / Análise do proteoma do fluído intercelular de folhas de laranjeiras infectadas com Xylella fastidiosa.
In order to understand the mechanisms regulating the Xylella fastidiosacitrus (Citrus sinensis var. Pêra) interaction, proteins with differential accumulation in the apoplast of Xf-infected citrus leaves with or without disease symptoms as compared to non-infected leaves, were identified and characterized using 2D-PAGE and mass spectrometry (MALDI-ToF). The
Publicado em: 2002
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33. Modulação da expressão de genes de patogenicidade putativos em Xylella fastidiosa sob condições de baixa e alta densidade celular. / Expression modulated putative pathogenesisrelated genes in Xylella fastidiosa at low and high cell-density conditions.
Xylella fastidiosa (Xf) é o agente causal de doenças em várias culturas economicamente importantes. Recentemente foi identificada como sendo o agente causal da clorose variegada dos citros (CVC), doença que representa um grande problema para os citricultores paulistas, pois vem causando perdas econômicas significativas. Trata-se de uma bactéria gram-ne
Publicado em: 2002
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34. THE NUTRITION OF PHYTOPATHOGENIC BACTERIA III. : The Gram-positive Phytopathogenic Corynebacterium Species
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35. Detection and identification of phytopathogenic Xanthomonas strains by amplification of DNA sequences related to the hrp genes of Xanthomonas campestris pv. vesicatoria.
Three pairs of oligonucleotide primers specific for different regions of the hrp gene (hypersensitive reaction and pathogenicity) cluster of Xanthomonas campestris pv. vesicatoria were designed and tested for amplification of DNA isolated from a large number of different bacteria. DNA sequences related to the hrp genes were successfully amplified from X. fra
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36. Expression of a human lactoferrin cDNA in tobacco cells produces antibacterial protein(s).
A suspension tobacco (Nicotiana tabacum L.) cell line was transformed to express human lactoferrin, an iron-binding glycoprotein. The transgenic calli produced a protein that was significantly smaller than the full-length lactoferrin protein. Total protein extracts made from transgenic tobacco callus exhibited much higher antibacterial activity than commerci