Symptom Induction
Mostrando 1-12 de 20 artigos, teses e dissertações.
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1. Analysis of the viral genetic determinants of symptom induction by a begomovirus in tomato and Nicotiana benthamiana / Análise de determinantes virais envolvidos na indução diferencial de sintomas por begomovírus em tomateiro e Nicotiana benthamiana
Os vírus pertencentes à família Geminiviridae são caracterizados pelo genoma composto por DNA circular de fita simples, encapsidado em uma partícula icosaédrica geminada. As espécies do gênero Begomovirus possuem grande importância econômica. No Brasil, o tomateiro é infectado por um complexo com pelo menos oito espécies de begomovírus. Dentre e
Publicado em: 2006
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2. The 126- and 183-kilodalton proteins of tobacco mosaic virus, and not their common nucleotide sequence, control mosaic symptom formation in tobacco.
Nucleotide substitutions at two positions within the open reading frame encoding the 126-kDa protein in the attenuated masked (M) strain of tobacco mosaic tobamovirus (TMV) to those found in the virulent U1-TMV genome led to the induction of near U1-TMV-like symptoms on leaves of Nicotiana tabacum L. cv. Xanthi nn by progeny virus (M. H. Shintaku, S. A. Cart
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3. A spontaneous mutation in the movement protein gene of brome mosaic virus modulates symptom phenotype in Nicotiana benthamiana.
Brome mosaic virus (BMV) is a positive-strand RNA virus with a multipartite genome that causes symptomless infection in Nicotiana benthamiana. We have isolated and characterized a strain of BMV that produced uniform vein chlorosis in systemically infected N. benthamiana. Analysis of pseudorecombinants constructed by exchanging RNA 1 and 2 and RNA 3 component
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4. Characterization of the Molecular Mechanism of Defective Interfering RNA-Mediated Symptom Attenuation in Tombusvirus-Infected Plants
Different tombusviruses were able to support the replication of either homologous or heterologous defective interfering (DI) RNAs, and those infected plants usually developed typical attenuated symptoms. However, in some helper virus-DI RNA combinations the inoculated plants were necrotized, although they contained a high level of DI RNA, suggesting that the
American Society for Microbiology.
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5. Identification of multiple structural domains regulating viroid pathogenicity.
To investigate the role of individual structural domains in viroid pathogenicity and replication, a series of interspecific chimeras was constructed by exchanging the terminal left (TL) and/or pathogenicity (P) domains between tomato apical stunt (TASVd) and citrus exocortis (CEVd) viroids. All six chimeras tested were replicated stably in tomato, and the sy
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6. Differential induction of chalcone synthase mRNA activity at the onset of phytoalexin accumulation in compatible and incompatible plant-pathogen interactions
Changes in the mRNA activity of chalcone synthase, the first enzyme of phenylpropanoid metabolism specific to flavonoid/isoflavonoid biosynthesis, have been investigated in relation to expression of the phytoalexin defense response in race-cultivar specific interactions between hypocotyls of Phaseolus vulgaris and the partially biotrophic fungus Colletotrich
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7. A DNAβ Associated with Tomato Yellow Leaf Curl China Virus Is Required for Symptom Induction
We report here that all 25 isolates of Tomato yellow leaf curl China virus (TYLCCNV) collected from tobacco, tomato, or Siegesbeckia orientalis plants in different regions of Yunnan Province, China, were associated with DNAβ molecules. To investigate the biological role of DNAβ, full-length infectious clones of viral DNA and DNAβ of TYLCCNV isolate Y10 (T
American Society for Microbiology.
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8. Induction of HSP70 and polyubiquitin expression associated with plant virus replication
By examining the front of virus invasion in immature pea embryos infected with pea seed-borne mosaic virus (PSbMV), the selective control of different host genes has been observed. From our observations, the early responses to PSbMV replication can be grouped into three classes, inhibited host gene expression, induced host gene expression, and no effect
The National Academy of Sciences of the USA.
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9. Systemic Acquired Tolerance to Virulent Bacterial Pathogens in Tomato1
Recent studies on the interactions between plants and pathogenic microorganisms indicate that the processes of disease symptom development and pathogen growth can be uncoupled. Thus, in many instances, the symptoms associated with disease represent an active host response to the presence of a pathogen. These host responses are frequently mediated by phytohor
American Society of Plant Biologists.
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10. Enhanced Expression and Activation of the Alternative Oxidase during Infection of Arabidopsis with Pseudomonas syringae pv tomato1
Cyanide-resistant (“alternative”) respiration was studied in Arabidopsis during incompatible and compatible infection with Pseudomonas syringae pv tomato DC3000. Total leaf respiration increased as the leaves became necrotic, as did the cyanide-resistant component that was sensitive to salicylhydroxamic acid. Infiltration of leaves with an avirulent stra
American Society of Plant Physiologists.
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11. A determinant of disease symptom severity is located in the 3'-terminal noncoding region of the RNA of a plant virus.
Inoculation of Nicotiana tabacum plants with RNA transcribed in vitro from a variant (pXBS8) of a cloned full-length DNA copy of tobacco vein mottling virus (TVMV) RNA resulted in attenuation of the vein mottling and blotching symptoms typically produced by transcripts of cloned wild-type cDNA (pXBS7). Similar amounts of virus were detected by ELISA (using a
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12. Patterning of Virus-Infected Glycine max Seed Coat Is Associated with Suppression of Endogenous Silencing of Chalcone Synthase Genes
Most commercial Glycine max (soybean) varieties have yellow seeds because of loss of pigmentation in the seed coat. It has been suggested that inhibition of seed coat pigmentation in yellow G. max may be controlled by homology-dependent silencing of chalcone synthase (CHS) genes. Our analysis of CHS mRNA and short-interfering RNAs provide clear evidence that
American Society of Plant Biologists.