Citrus Chlorosis Variegated
Mostrando 13-24 de 48 artigos, teses e dissertações.
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13. Analysis of expressed sequence tags from Citrus sinensis L. Osbeck infected with Xylella fastidiosa
In order to understand the genetic responses resulting from physiological changes that occur in plants displaying citrus variegated chlorosis (CVC) symptoms, we adopted a strategy of comparing two EST libraries from sweet orange [Citrus sinensis (L.) Osbeck]. One of them was prepared with plants showing typical CVC symptoms caused by Xylella fastidiosa and t
Genetics and Molecular Biology. Publicado em: 2007
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14. Influence of water regime in the infection of young citrus plants by Xylella fastidiosa / Influência do regime hídrico na infecção de plantas cítricas jovens por Xylella fastidiosa
In Brazil, about 38% of the citric trees of the São Paulo State are affected by the Citrus Variegated Chlorosis - CVC, causing annual losses of about 100 million dollars for the citrus industries. The causal agent of CVC is a gram-negative, fastidious bacterium inhabitant of the xylem vessels called Xylella fastidiosa. It is vectored by sharpshooter leafhop
Publicado em: 2007
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15. Genetic transformation of sweet orange (Citrus sinensis L. Osbeck) with the cecropin MB39 gene and evaluation of transgenic plants inoculated with Xylella fastidiosa Wells et al. / Transformação genética de laranja doce (Citrus sinensis L. Osbeck) com o gene cecropin MB39 e avaliação de plantas transgênicas inoculadas com Xylella fastidiosa Wells et al.
A obtenção de plantas geneticamente modificadas tornou-se uma ferramenta biotecnológica de grande valor, contribuindo nos programas de melhoramento. Plantas transgênicas contendo genes de peptídeos antibacterianos são uma boa alternativa nos programas visando resistência às bactérias. A cecropina é um peptídeo isolado de inseto que apresenta açã
Publicado em: 2007
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16. Establishment of a trap cropping strategy for controlling sharpshooter vectors of Xylella fastidiosa in citrus groves / Estudos básicos para a utilização de plantio-isca visando ao controle de cigarrinhas vetoras de Xylella fastidiosa em pomares cítricos
Clorose Variegada dos Citros (CVC), causada pela bactéria Xylella fastidiosa Wells et al., tem causado grandes perdas na citricultura do estado de São Paulo, afetando cerca de 40% das plantas de laranja doce. A bactéria é transmitida por 12 espécies de cigarrinhas sugadoras de xilema (Hemiptera: Cicadellidae) da subfamília Cicadellinae. O manejo da CVC
Publicado em: 2007
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17. Specific amplification of iron receptor genes in Xylella fastidiosa strains from different hosts
Bacterial production of siderophores may involve specific genes related to nonribosomal peptide and polyketide biosynthesis, which have not been fully identified in the genome of Xylella fastidiosa strain 9a5c. However, a search for siderophore-related genes in strain 9a5c indicated five membrane receptors, including siderophore, ferrichrome-iron and hemin r
Genetics and Molecular Biology. Publicado em: 2006
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18. Citrus protoplast fusion and evaluation of the somatic hybrid Hamlin sweet orange + Montenegrina mandarin for resistance to Xanthomonas axonopodis pv. citri and Xylella fastidiosa / Fusão de protoplastos de citros e avaliação da resistência do híbrido somático laranja Hamlin + mexerica Montenegrina a Xanthomonas axonopodis pv. citri e Xylella fastidiosa
Buscou-se produzir híbridos somáticos entre laranjas doces (Citrus sinensis) com tangerinas, mexericas (C. reticulata, C. reshni, C. sunki, C. deliciosa), tangores (C reticulata x C. sinensis) ou tangelo Orlando (C. reticulata x C. paradisi), além da avaliação da resistência do híbrido somático laranja Hamlin (C. sinensis) + mexerica Monten
Publicado em: 2006
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19. Role of the Xf-0818 cellulase in the Xylella fastidiosa X citrus interaction. / Papel da celulase XF-0818 na interação Xylella fastidiosa X Citros.
From the genome sequencing of the bacteria Xylella fastidiosa, the agent responsible for the citrus variegated chlorosis (CVC), studies on the pathogenicity mechanisms expressed during the occurrence of the disease were started in genomic function projects, aiming to confirm the function of the genic sequences identified in the project X. fastidiosa Genome.
Publicado em: 2005
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20. Genetic transformation of citrus with bacterio-opsin (bo), cecropin and gus genes. / Transformação genética de citros com os genes bacteriopsina (bO), cecropina e gus.
Application of modern biotechnology techniques, as genetic transformation, has helped breeding programs of perennial plant species. This technique is already successfully used in citrus in several countries, mostly to the production of more disease-tolerant plants. Present work had three objectives as it follows: 1. genetic transformation of Rangpur lime roo
Publicado em: 2005
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21. Produção de bacteriocinas por endófitos de citros e caracterização da endoficina L de Curtobacterium flaccumfaciens endofítico / Production of bacteriocin by citrus endophytes and characterization of the endophycin l from Curtobacterium flaccumfaciens endophytic
Bacteriocins are antimicrobial proteins produced by bacteria, which play a role in microbial ecology. In this work we examined the bacteriocin production and it effects under a citrus bacterial communities belonged to Curtobacterium and Methylobacterium genera isolated from Citrus sinensis (sweet orangeuninfected, symptomatic, CVC-asymptomatic) and Citrus re
Publicado em: 2005
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22. Produção de mudas cítricas em viveiro: uso de substrato alternativo e inoculação com Xylella fastidiosa. / Production of citrus seedlings in nursery: use of alternative substratum and inoculation with Xylella fastidiosa.
Alternative substrates have being used for a better establishment of plants at nursery stages, thus ensuring that healthier plants will be transferred to the field. In the case of Citrus, this is a concern especially when there is a past history of diseases at field conditions, such as Citrus Variegated Chlorosis caused by Xylella fastidiosa (X.f.). This stu
Publicado em: 2004
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23. Development of a model to predict the occurrence of Ecdytolopha aurantiana (Lima, 1927) (Lepidoptera: Tortricidae) and an integrated web system to support citrus producers. / Desenvolvimento de um modelo para previsão de ocorrência de Ecdytolopha aurantiana (Lima, 1927) (Lepidoptera: Tortricidae) e um Sistema WEB Integrado de Apoio ao Citricultor.
Citrus fruits are Brazils major exporting sources, and São Paulo is accountable for approximately 80% of the total production. Among the factors that limit the Brazilian citriculture, especially in the state of São Paulo, one points in the past few years the citrus variegated chlorosis (CVC), flower rot, citrus leaf miner and citrus fruit borer, Ecdytolo
Publicado em: 2004
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24. 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