Pvx
Mostrando 13-24 de 49 artigos, teses e dissertações.
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13. Potato clones immune to PVY from crosses between cv. Chiquita and clones simplex for the Ry allele. / Clones de batata imunes ao PVY derivados da cv. Chiquita x clones simplex para o alelo Ry
Clonal families were obtained from biparental crosses between cv Chiquita and clones (named JUG) immune to PVX and PVY. Cultivar Chiquita presents high levels of resistance to early blight (Alternaria solani) and has good general combining ability for this trait. The objective was to generate clones with resistance to the fungus and the viruses diseases. All
Publicado em: 2005
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14. Indexação de matrizes e eliminação do Potato virus Y em plantas de batata cultivadas in vitro
Cultivares de batata (Solanum tuberosum L.) têm mostrado degenerescência causada por vírus após ciclos sucessivos do uso de tubérculos de campos comerciais como material propagativo. Este trabalho verifica a ocorrência de infecção simples e mista de quatro vírus da batata na Paraíba e apresenta adequação da técnica de cultivo in vitro para obten
Scientia Agricola. Publicado em: 2003
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15. Seleção de clones de batata para microclimas de altitude no Planalto Central
Iniciou-se em 1986, em Anápolis, um programa de desenvolvimento de cultivares de batata adaptadas ao clima de altitude do Brasil Central, partindo-se de 15.000 genótipos, resultantes de 200 famílias obtidas pela Embrapa Hortaliças em 1985 e 1986. No primeiro ciclo, em 1986, foram selecionados 5.000 genótipos, considerando-se aspectos fenológicos, incid
Horticultura Brasileira. Publicado em: 2002-09
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16. Efeito de infecções simples e dupla com Potato virus X e Tobacco mosaic virus sobre o desenvolvimento da doença, crescimento da planta e acumulação de vírus em tomate
A cultivar de tomate (Lycopersicon esculentum) Fukuju nº 2 foi usada para estudar o efeito de infecçöes simples e duplas com o vírus X da batata (Potato virus X, PVX) e o vírus do mosaico do fumo (Tobacco mosaic virus, TMV). A infecção mista resultou em um aumento sinérgico da severidade da doença, mostrando maior redução no crescimento com inocul
Fitopatologia Brasileira. Publicado em: 2002-06
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17. Assembly and movement of a plant virus carrying a green fluorescent protein overcoat.
Potato virus X (PVX) is a filamentous plant virus infecting many members of the family Solanaceae. A modified form of PVX, PVX.GFP-CP which expressed a chimeric gene encoding a fusion between the 27-kDa Aequorea victoria green fluorescent protein and the amino terminus of the 25-kDa PVX coat protein, assembled into virions and moved both locally and systemic
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18. Expression of Amino-Terminal Portions or Full-Length Viral Replicase Genes in Transgenic Plants Confers Resistance to Potato Virus X Infection.
The first open reading frame (ORF 1) of potato virus X (PVX) encodes a putative replicase gene. Transgenic tobacco lines expressing ORF 1 are resistant to PVX infection when inoculated with either PVX or PVX RNA. Analyses of lines containing various portions of the ORF 1 gene demonstrated that resistance is conferred to plants by expressing approximately the
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19. Plant viral synergism: the potyviral genome encodes a broad-range pathogenicity enhancer that transactivates replication of heterologous viruses.
Synergistic viral diseases of higher plants are caused by the interaction of two independent viruses in the same host and are characterized by dramatic increases in symptoms and in accumulation of one of the coinfecting viruses. In potato virus X (PVX)/potyviral synergism, increased pathogenicity and accumulation of PVX are mediated by the expression of poty
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20. Multipartite nature of potato virus X.
Potato virus X (PVX) was among the first viruses to be purified. Nonetheless, properties of the purified virus remain contentious. The literature has been heavily influenced by the concept of a virus as a monopartite entity. Despite the fact that electron micrographs invariably show large proportions of shorter virus particles, the latter are universally ign
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21. Analysis of the mechanism of protection in transgenic plants expressing the potato virus X coat protein or its antisense RNA
Transgenic tobacco plants engineered to express either the potato virus X (PVX) coat protein (CP+) or the antisense coat protein transcript (CP-antisense) were protected from infection by PVX, as indicated by reduced lesion numbers on inoculated leaves, delay or absence of systemic symptom development and reduction in virus accumulation in both inoculated an
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22. Initiation and maintenance of virus-induced gene silencing
The phytoene desaturase (PDS) gene of Nicotiana benthamiana was silenced in plants infected with potato virus X (PVX) vectors carrying PDS inserts, and a green fluorescent protein (GFP) transgene was silenced in plants infected with PVX-GFP. This virus-induced gene silencing (VIGS) is post-transcriptional and cytoplasmic because it is targeted against exons
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23. A Potato Virus X Resistance Gene Mediates an Induced, Nonspecific Resistance in Protoplasts.
The Rx locus in potato controls extreme resistance to most isolates of potato virus X (PVX). The resistance is expressed in whole plants and in protoplasts. Rx-mediated resistance in protoplasts causes reduced accumulation of all PVX RNA species, including the (-) strand RNA after a lag of 8 hr postinoculation. In work reported elsewhere, we have shown that
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24. An eight-nucleotide sequence in the potato virus X 3' untranslated region is required for both host protein binding and viral multiplication.
Gel retardation and UV-cross-linking techniques were used to demonstrate that two tobacco proteins, with approximate molecular masses of 28 and 32 kDa, bind to a site within the 3' region of potato virus X (PVX) genomic RNA. The protein binding is specific, in that a 50-fold excess of unlabeled probe prevents formation of the complexes but no reduction is ob