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Rice phloem thioredoxin h has the capacity to mediate its own cell-to-cell transport through plasmodesmata.

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Rice (Oryza sativa L.) phloem sieve tubes contain RPP13-1, a thioredoxin h protein that moves around the plant via the translocation stream. Such phloem-mobile proteins are thought to be synthesized in the companion cells prior to being transferred, through plasmodesmata, to the enucleate sieve-tube

Evaluation of Host Resistance and Soil Fumigation for the Management of Black Root Rot of Tobacco in Ontario.

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Black root rot of tobacco, caused by the soilborne fungus Thielaviopsis basicola, is a serious problem in many tobacco (Nicotiana tabacum L.)-growing regions of the world. In Ontario, the disease is favored by cool, wet soil conditions and heavy textured or poorly drained soils. Yield loss can be

Changes in symplastic permeability during adventitious shoot regeneration in tobacco thin cell layers.

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Thin cell layer (TCL) explants of tobacco (Nicotiana tabacum L.) were cultured in either a regeneration medium that resulted in formation of adventitious vegetative shoots or a non-regeneration (control) medium that maintained the TCLs but did not promote shoot formation. Microinjections were

Altered function of the tobacco mosaic virus movement protein in a hypersensitive host.

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The N gene in Nicotiana sp. confers hypersensitive resistance to all strains of tobacco mosaic virus (TMV) and limits the rate of virus spread in infected leaves. To examine the role of the movement protein (MP) of TMV in the hypersensitive reaction (HR), transgenic Nicotiana tabacum cv. Xanthi-nc

Effect of virus infection on symplastic transport of fluorescent tracers in Nicotiana clevelandii leaf epidermis.

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The molecular weight exclusion limit of plasmodesmata in subveinal epidermal cells of Nicotiana clevelandii (Gray) leaves was estimated by microinjection and fluorescence microscopy using fluorescein isothiocyanate-peptide conjugates, carboxyfluorescein and Lucifer Yellow CH. The largest

Interaction of a hydroxyproline-rich glycoprotein from tobacco callus with potential pathogens.

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A hydroxyproline-rich glycoprotein was isolated from tobacco (Nicotiana tabacum L.) callus tissue cultures by an acidic-ethanol extraction procedure and purified to about 95% homogeneity by ion exchange chromatography on carboxymethyl cellulose. This glycoprotein agglutinated cells of an avirulent

Endocytosis of Xanthomonas campestris pathovar campestris lipopolysaccharides in non-host plant cells of Nicotiana tabacum.

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The specific recognition of phytopathogenic bacteria by plant cells is generally mediated by a number of signal molecules. The elicitor-active lipopolysaccharides (LPS) of the phytopathogenic bacterium Xanthomonas campestris pv. campestris (X.c.c) are recognized by its non-host plant Nicotiana

A DREPP protein interacted with PeaT1 from Alternaria tenuissima and is involved in elicitor-induced disease resistance in Nicotiana plants.

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PeaT1 is a proteinaceous elicitor from fungal pathogen Alternaria tenuissima. Our previous research revealed that this elicitor could induce defense response and enhance disease resistance in various plants including Nicotiana plants. However, immune activation mechanisms whereby PeaT1 elicits

Cucumber mosaic virus 3a protein potentiates cell-to-cell trafficking of CMV RNA in tobacco plants.

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Contrary to a previous report, electron microscopic studies on the Fny strain of cucumber mosaic virus (CMV)-infected tobacco tissues revealed that plasmodesmata were not structurally modified during CMV infection, nor were virions ever observed in plasmodesmata connecting infected cells. To further

The Potato Aphid Salivary Effector Me47 Is a Glutathione-S-Transferase Involved in Modifying Plant Responses to Aphid Infestation.

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Polyphagous aphid pests cause considerable economic damage to crop plants, primarily through the depletion of photoassimilates and transfer of viruses. The potato aphid (Macrosiphum euphorbiae) is a notable pest of solanaceous crops, however, the molecular mechanisms that underpin the ability to

Cell specific, cross-species expression of myrosinases in Brassica napus, Arabidopsis thaliana and Nicotiana tabacum.

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A prototypical characteristic of the Brassicaceae is the presence of the myrosinase-glucosinolate system. Myrosinase, the only known S-glycosidase in plants, degrades glucosinolates, thereby initiating the formation of isothiocyanates, nitriles and other reactive products with biological activities.

Plasmodesmatal function is probed using transgenic tobacco plants that express a virus movement protein.

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A gene encoding a temperature-sensitive mutant (MPP154A) of the 30-kilodalton movement protein (MP) of tobacco mosaic virus (TMV) was transformed into Nicotiana tabacum cv Xanthi. Transgenic plants expressing the MPP154A gene complemented local and systemic movement of an MP-defective mutant of TMV

Biosynthesis of cabbage phytoalexins from indole glucosinolate.

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Brassica crop species are prolific producers of indole-sulfur phytoalexins that are thought to have an important role in plant disease resistance. These molecules are conspicuously absent in the model plant Arabidopsis thaliana, and little is known about the enzymatic steps that assemble the key

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