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Página 1 a partir de 1483 resultados
Structure and activity of proteins from pathogenic fungi Phytophthora eliciting necrosis and acquired resistance in tobacco.
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The phytopathogenic fungi Phytophthora cryptogea and Phytophthora capsici cause systemic leaf necrosis on their non-host tobacco; in culture they release proteins, called cryptogein and capsicein, which elicit similar necrosis. In addition, both proteins protect tobacco against invasion by the
Identification of an internal RNA element essential for replication and translational enhancement of tobacco necrosis virus A(C).
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Different regulatory elements function are involved in plant virus gene expression and replication by long-distance RNA-RNA interactions. A cap-independent functional element of the Barley yellow dwarf virus (BYDV) - like translational enhancer (BTE) is present in Tobacco necrosis virus A (TNV-A), a
Serological and coat protein sequence studies suggest that necrosis disease on sunflower in India is caused by a strain of Tobacco streak ilarvirus.
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Serological and coat protein sequence studies were conducted to identify an ilarvirus associated with necrosis disease on sunflower in India. In electroblot immunoassay, sunflower ilarvirus reacted strongly only with antiserum to Tobacco streak virus (TSV). The coat protein gene of sunflower
First Complete Genome Sequence of Tobacco necrosis virus D Isolated from Soybean and from North America.
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We present the first complete genome sequence of the tombusvirus Tobacco necrosis virus D (TNV-D) from North America, obtained from an infected soybean plant. Compared with the three other TNV-D genomes isolated from different geographic regions and host plants, its nucleotide identities were
Assessing Potato Cultivar Sensitivity to Tuber Necrosis Caused by Tobacco rattle virus.
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Tobacco rattle virus (TRV) causes the economically important corky ring spot disease in potato. Chemical control is difficult due to the soilborne nature of the TRV-transmitting nematode vector, and identifying natural host resistance against TRV is considered to be the optimal control measure. The
Recombination of strain O segments to HCpro-encoding sequence of strain N of Potato virus Y modulates necrosis induced in tobacco and in potatoes carrying resistance genes Ny or Nc.
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Hypersensitive resistance (HR) to strains O and C of Potato virus Y (PVY, genus Potyvirus) is conferred by potato genes Ny(tbr) and Nc(tbr), respectively; however, PVY N strains overcome these resistance genes. The viral helper component proteinases (HCpro, 456 amino acids) from PVY(N) and PVY(O)
Tobacco veinal necrosis determinants are unlikely to be located within the 5' and 3' terminal sequences of the potato virus Y genome.
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Three potato virus Y isolates, representatives of distinct PVY groups, identified in potato fields in northern Poland were submitted to biological and molecular analysis. Phenotypically, two isolates, PVYN-Ny and PVYN-Wi, belong to the necrotic strain and the third one (PVYO-LW) to the common
A novel recombinant strain of Potato virus Y suggests a new viral genetic determinant of vein necrosis in tobacco.
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A novel Potato virus Y (PVY) isolate, L26, recovered from a Frontier potato line was initially typed as a PVY(NTN) strain using multiplex RT-PCR and serological assays. However, L26 induced mosaic and mild vein clearing symptoms in tobacco rather than vein necrosis characteristic of the PVY (NTN)
The Potato virus Y M(S)N(R) NIb-replicase is the elicitor of a veinal necrosis-hypersensitive response in root knot nematode resistant tobacco.
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Summary A root knot nematode resistance gene in Nicotiana tabacum, Rk, providing resistance to the nematode parasite Meloidogyne incognita is tightly linked to, or is a pleiotropic gene with a veinal necrosis systemic hypersensitive response to infection by Potato virus Y (PVY) M(s)N(r). The single
Identification of new Potato virus Y (PVY) molecular determinants for the induction of vein necrosis in tobacco.
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Two tobacco vein necrosis (TVN) determinants, the residues K(400) and E(419) , have been identified previously in the helper component-protease (HC-Pro) protein sequence of Potato virus Y (PVY). However, since their description, non-necrotic PVY isolates with both K(400) and E(419) necrotic
Characterization of Potato virus Y (PVY) molecular determinants involved in the vein necrosis symptom induced by PVYN isolates in infected Nicotiana tabacum cv. Xanthi.
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Viral molecular determinant(s) involved in the tobacco vein necrosis (TVN) symptom induced by necrotic isolates of Potato virus Y (PVY) on Nicotiana tabacum cv. Xanthi leaves remain undetermined. Reference isolates belonging to PVY(N) (infectious PVY(N)-605 clone) and PVY(O) (PVY(O)-139) were used
[A study on the mechanism of copper-induced resistance to potato virus Y-vein necrosis strain (PVY(N)) in tobacco].
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In order to reveal the induced resistance mechanism of tobacco treated with copper solution to potato virus Y-vein necrosis strain (PVY(N)), disease indexes, contents of virus and some physiological and biochemical indexes in tobacco were studied. The results showed that when treated at the copper
The acquisition of molecular determinants involved in potato virus Y necrosis capacity leads to fitness reduction in tobacco plants.
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The prevalence of necrotic potato virus Y (PVY) in natural populations could reflect increased fitness of necrotic isolates. In this paper, the effects of the acquisition of molecular determinants (A/G(2213) and A/C(2271)) involved in necrosis capacity on both the number of progeny produced and the
Mutations that Affect Agrobacterium vitis-Induced Grape Necrosis also Alter Its Ability to Cause a Hypersensitive Response on Tobacco.
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ABSTRACT Tn5-induced mutations in Agrobacterium vitis F2/5 resulted in both altered grape necrosis and tobacco leaf panel collapse phenotypes, suggesting that the underlying mechanisms of the reactions are related. The reaction on tobacco resembles the classical hypersensitive response (HR) caused
Sequence heterogeneity in satellite tobacco necrosis virus RNA.
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Satellite tobacco necrosis virus (STNV) RNAs isolated from early, middle, and late passage virus stocks were found to contain substantial and reproducible sequence variations which increased with passage of the virus. Several instances of clustered or correlated sequence changes were found. This
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