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Reverse Genetic Analysis of Antiviral Resistance Signaling and the Resistance Mechanism in Arabidopsis thaliana.

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Antiviral RNA silencing and the resistance gene-conferred defense response are major antiviral immune systems in plants. Several of the components involved have been genetically or biochemically identified in Arabidopsis thaliana. One powerful tool to dissect antiviral immune systems involves a

Different Dicer-like protein components required for intracellular and systemic antiviral silencing in Arabidopsis thaliana.

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Eukaryotes employ RNA silencing as an innate defense system against invading viruses. Dicer proteins play the most crucial role in initiating this antiviral pathway as they recognize and process incoming viral nucleic acids into small interfering RNAs. Generally, 2 successive infection stages

Salicylic acid-induced resistance to Cucumber mosaic virus in squash and Arabidopsis thaliana: contrasting mechanisms of induction and antiviral action.

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Salicylic acid (SA)-induced resistance to Cucumber mosaic virus (CMV) in tobacco (Nicotiana tabacum) results from inhibition of systemic virus movement and is induced via a signal transduction pathway that also can be triggered by antimycin A, an inducer of the mitochondrial enzyme alternative

The 21-nucleotide, but not 22-nucleotide, viral secondary small interfering RNAs direct potent antiviral defense by two cooperative argonautes in Arabidopsis thaliana.

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Arabidopsis thaliana defense against distinct positive-strand RNA viruses requires production of virus-derived secondary small interfering RNAs (siRNAs) by multiple RNA-dependent RNA polymerases. However, little is known about the biogenesis pathway and effector mechanism of viral secondary siRNAs.

Antiviral ARGONAUTEs Against Turnip Crinkle Virus Revealed by Image-Based Trait Analysis.

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RNA-based silencing functions as an important antiviral immunity mechanism in plants. Plant viruses evolved to encode viral suppressors of RNA silencing (VSRs) that interfere with the function of key components in the silencing pathway. As effectors in the RNA silencing pathway, ARGONAUTE (AGO)

The Plant Non-canonical Antiviral Resistance Protein JAX1 Inhibits Potexviral Replication by Targeting the Viral RNA-dependent RNA Polymerase.

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Understanding the innate immune mechanisms of plants is necessary for breeding of disease-resistant lines. Previously, we identified the antiviral resistance gene JAX1 from Arabidopsis thaliana, which inhibits infection by potexviruses. JAX1 encodes a unique jacalin-type lectin protein. In this

RDR6 has a broad-spectrum but temperature-dependent antiviral defense role in Nicotiana benthamiana.

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SDE1/SGS2/RDR6, a putative RNA-dependent RNA polymerase (RdRP) from Arabidopsis thaliana, has previously been found to be indispensable for maintaining the posttranscriptional silencing of transgenes, but it is seemingly redundant for antiviral defense. To elucidate the antiviral role of this RdRP

A trio of viral proteins tunes aphid-plant interactions in Arabidopsis thaliana.

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BACKGROUND Virus-induced deterrence to aphid feeding is believed to promote plant virus transmission by encouraging migration of virus-bearing insects away from infected plants. We investigated the effects of infection by an aphid-transmitted virus, cucumber mosaic virus (CMV), on the interaction of

Differential contributions of plant Dicer-like proteins to antiviral defences against potato virus X in leaves and roots.

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Members of the plant Dicer-like (DCL) protein family are the critical components of the RNA-silencing pathway that mediates innate antiviral defence. The distinct antiviral role of each individual DCL protein has been established with mostly based on observations of aerial parts of plants. Thus,

The Importance of the KR-Rich Region of the Coat Protein of Ourmia melon virus for Host Specificity, Tissue Tropism, and Interference With Antiviral Defense.

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The N-terminal region of the Ourmia melon virus (OuMV) coat protein (CP) contains a short lysine/arginine-rich (KR) region. By alanine scanning mutagenesis, we showed that the KR region influences pathogenicity and virulence of OuMV without altering viral particle assembly. A mutant, called

Mutations in the antiviral RNAi defense pathway modify Brome mosaic virus RNA recombinant profiles.

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RNA interference (RNAi) mechanism targets viral RNA for degradation. To test whether RNAi gene products contributed to viral RNA recombination, a series of Arabidopsis thaliana RNAi-defective mutants were infected with Brome mosaic virus (BMV) RNAs that have been engineered to support crossovers

A Sensitized Genetic Screen to Identify Novel Components and Regulators of the Host Antiviral RNA Interference Pathway.

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RNA interference (RNAi) acts as a natural defense mechanism against virus infection in plants and animals. Much is known about the antiviral function of the core RNAi pathway components identified mostly by genetic screens based on specific RNAi of cellular mRNAs. Here we describe a sensitized

Polysaccharide Peptide-Induced Virus Resistance Depends on Ca2+ Influx by Increasing the Salicylic Acid Content and Upregulating the Leucine-Rich Repeat Gene in Arabidopsis thaliana.

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Plant viral diseases cause severe economic losses in agricultural production. The development of biosource-derived antiviral agents provides an alternative strategy to efficiently control plant viral diseases. We previously reported that the exogenous application of polysaccharide peptide (PSP)

Deficiency of the eIF4E isoform nCBP limits the cell-to-cell movement of a plant virus encoding triple-gene-block proteins in Arabidopsis thaliana.

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One of the important antiviral genetic strategies used in crop breeding is recessive resistance. Two eukaryotic translation initiation factor 4E family genes, eIF4E and eIFiso4E, are the most common recessive resistance genes whose absence inhibits infection by plant viruses in Potyviridae,

Effects of dicer-like endoribonucleases 2 and 4 on infection of Arabidopsis thaliana by cucumber mosaic virus and a mutant virus lacking the 2b counter-defence protein gene.

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In tobacco and Nicotiana benthamiana, limited cross-protection against cucumber mosaic virus strain Fny (Fny-CMV) was provided by prior inoculation with a deletion mutant lacking the 2b silencing-suppressor protein gene (Fny-CMVDelta2b). Cross-protection by Fny-CMVDelta2b did not result from

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