Induction of glutathione S-transferase activity in tobacco by tobacco necrosis virus infection and by salicylic acid

1995 ◽  
Vol 45 (3) ◽  
pp. 290-291 ◽  
Author(s):  
GÁBor Gullner ◽  
József Fodor ◽  
Lóránt Király
Keyword(s):  
Salicylic Acid ◽  
Virus Infection ◽  
Tobacco Necrosis Virus ◽  
Transferase Activity ◽  
Glutathione S Transferase ◽  
Necrosis Virus

Injured cells required for the initiation of plant virus infections

1969 ◽  
Vol 47 (3) ◽  
pp. 499-500 ◽  
Author(s):  
W. C. Kimmins ◽  
M. D. Casselman
Keyword(s):  
Phaseolus Vulgaris ◽  
Virus Infection ◽  
Plant Virus ◽  
Tobacco Necrosis Virus ◽  
Virus Infections ◽  
Necrosis Virus

To investigate whether a plant virus infection could be initiated in uninjured cells, the trifoliate leaves of Phaseolus vulgaris var. Prince were dipped into suspensions of tobacco necrosis virus. It is concluded that infection can only be established through injured leaf cells.

scholarly journals Transport of Salicylic Acid in Tobacco Necrosis Virus-Infected Cucumber Plants

1996 ◽  
Vol 112 (2) ◽  
pp. 787-792 ◽  
Author(s):  
W. Molders ◽  
A. Buchala ◽  
J. P. Metraux
Keyword(s):  
Salicylic Acid ◽  
Tobacco Necrosis Virus ◽  
Necrosis Virus

scholarly journals Identification of Tobacco Necrosis Virus in Deteriorating Clones of Aspen

1979 ◽  
Vol 25 (4) ◽  
pp. 557-567
Author(s):  
Craig R. Hibben ◽  
Robert F. Bozarth ◽  
Judith Reese
Keyword(s):  
Virus Infection ◽  
Populus Tremuloides ◽  
Gradient Centrifugation ◽  
Rocky Mountain ◽  
Sucrose Density Gradient ◽  
Tobacco Necrosis Virus ◽  
Necrosis Virus ◽  
Sucrose Density Gradient Centrifugation ◽  
Rocky Mountain Region ◽  
Exact Etiology

Abstract Aspen (Populus tremuloides) is deteriorating in some sites in the middle Rocky Mountain region. Several causal factors have been implicated, but the exact etiology of aspen deterioration remains unknown. Foliar symptoms indicative of virus infection were observed in trees within 33 aspen clones, both deteriorating and nondeteriorating, in Utah. A virus was mechanically transmitted from five deteriorating clones to cowpea (Vigna unguiculata). Sucrose density-gradient centrifugation of one isolate of the virus revealed a single infectious component with a sedimentation velocity of S20,W = 110. Electron micrographs of the purified virus showed isometric particles 28 +ACY-plusmn+ADs- 1 nm diameter. Properties of the purified aspen virus and its antiserum showed the virus to be an isolate of tobacco necrosis virus (TNV-A). This is the first report of TNV in aspen. Two additional isolates of TNV antigenically dissimilar to TNV-A and to each other were recovered from one of the same five deteriorating clones. Healthy rooted aspen suckers were infected with purified TNV-A by mechanical inoculation. The possible role of virus infection in aspen deterioration is discussed. Forest Sci. 25:557-567.

scholarly journals Salicylic Acid Biosynthetic Genes Expressed in Pseudomonas fluorescens Strain P3 Improve the Induction of Systemic Resistance in Tobacco Against Tobacco Necrosis Virus

1998 ◽  
Vol 88 (7) ◽  
pp. 678-684 ◽  
Author(s):  
M. Maurhofer ◽  
C. Reimmann ◽  
P. Schmidli-Sacherer ◽  
S. Heeb ◽  
D. Haas ◽  
...  
Keyword(s):  
Salicylic Acid ◽  
Systemic Acquired Resistance ◽  
Biocontrol Agent ◽  
Acquired Resistance ◽  
Expression Vectors ◽  
Systemic Resistance ◽  
Tobacco Necrosis Virus ◽  
Induce Systemic Resistance ◽  
Necrosis Virus

Application of salicylic acid induces systemic acquired resistance in tobacco. pchA and pchB, which encode for the biosynthesis of salicylic acid in Pseudomonas aeruginosa, were cloned into two expression vectors, and these constructs were introduced into two root-colonizing strains of P. fluorescens. Introduction of pchBA into strain P3, which does not produce salicylic acid, rendered this strain capable of salicylic acid production in vitro and significantly improved its ability to induce systemic resistance in tobacco against tobacco necrosis virus. Strain CHA0 is a well-described biocontrol agent that naturally produces salicylic acid under conditions of iron limitation. Introduction of pchBA into CHA0 increased the production of salicylic acid in vitro and in the rhizosphere of tobacco, but did not improve the ability of CHA0 to induce systemic resistance in tobacco. In addition, these genes did not improve significantly the capacity of strains P3 and CHA0 to suppress black root rot of tobacco in a gnotobiotic system.

scholarly journals Regioselective Base-induced Condensations of Acrylic Acid Derivatives

1999 ◽  
Vol 23 (3) ◽  
pp. 174-175
Author(s):  
E. Abdel-Ghani
Keyword(s):  
Carboxylic Acid ◽  
Acrylic Acid ◽  
Dicarboxylic Acid ◽  
Ethyl Acetoacetate ◽  
Tobacco Necrosis Virus ◽  
Necrosis Virus ◽  
Antiviral Activities

The orientation of cyclization of the reaction of methyl aroylacrylate (1) and aroylacrylic acid (8) with ethyl acetoacetate and/or thiourea leading to the formation of 4-aroylmethylcyclopentane-1,3-dione (2) 5-aryl-3-oxocyclohexene-1,2-dicarboxylic acid (9), 2-imino-5-aroylmethylthiazolidin-4-one (11) and 6-aryl-2-sulfonylpyrimidine-4-carboxylic acid (14) depends on the medium employed; some compounds show moderate antiviral activities against tobacco necrosis virus.

scholarly journals Progression of Watermelon Bud Necrosis Virus Infection in Its Vector, Thrips palmi

Cells ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 392
Author(s):  
Amalendu Ghosh ◽  
Priti ◽  
Bikash Mandal ◽  
Ralf G. Dietzgen
Keyword(s):  
Virus Infection ◽  
Salivary Glands ◽  
Frankliniella Occidentalis ◽  
Western Flower Thrips ◽  
Malpighian Tubules ◽  
Necrosis Virus ◽  
Posterior Portion ◽  
Thrips Palmi ◽  
Thrips Species ◽  
Anterior Midgut

Thrips are important pests of agricultural, horticultural, and forest crops worldwide. In addition to direct damages caused by feeding, several thrips species can transmit diverse tospoviruses. The present understanding of thrips–tospovirus relationships is largely based on studies of tomato spotted wilt virus (TSWV) and Western flower thrips (Frankliniella occidentalis). Little is known about other predominant tospoviruses and their thrips vectors. In this study, we report the progression of watermelon bud necrosis virus (WBNV) infection in its vector, melon thrips (Thrips palmi). Virus infection was visualized in different life stages of thrips using WBNV-nucleocapsid protein antibodies detected with FITC-conjugated secondary antibodies. The anterior midgut was the first to be infected with WBNV in the first instar larvae. The midgut of T. palmi was connected to the principal salivary glands (PSG) via ligaments and the tubular salivary glands (TSG). The infection progressed to the PSG primarily through the connecting ligaments during early larval instars. The TSG may also have an ancillary role in disseminating WBNV from the midgut to PSG in older instars of T. palmi. Infection of WBNV was also spread to the Malpighian tubules, hindgut, and posterior portion of the foregut during the adult stage. Maximum virus-specific fluorescence in the anterior midgut and PSG indicated the primary sites for WBNV replication. These findings will help to better understand the thrips–tospovirus molecular relationships and identify novel potential targets for their management. To our knowledge, this is the first report of the WBNV dissemination path in its vector, T. palmi.

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