Metabolic Changes Associated with Systemic Induced Resistance to Tobacco Mosaic Virus in Samsun NN Tobacco

1971 ◽  
Vol 61 (3) ◽  
pp. 293 ◽  
Author(s):  
Thomas J. Simons
Keyword(s):  
Tobacco Mosaic Virus ◽  
Mosaic Virus ◽  
Induced Resistance ◽  
Metabolic Changes ◽  
Systemic Induced Resistance

scholarly journals Enhanced Glutathione Metabolism Is Correlated with Sulfur-Induced Resistance in Tobacco mosaic virus–Infected Genetically Susceptible Nicotiana tabacum Plants

2010 ◽  
Vol 23 (11) ◽  
pp. 1448-1459 ◽  
Author(s):  
Kerstin Höller ◽  
Lóránt Király ◽  
András Künstler ◽  
Maria Müller ◽  
Gábor Gullner ◽  
...  
Keyword(s):  
Nicotiana Tabacum ◽  
Tobacco Mosaic Virus ◽  
Mosaic Virus ◽  
Induced Resistance ◽  
Marker Gene ◽  
General Mechanism ◽  
Glutathione Metabolism ◽  
Tobacco Plants ◽  
Glutathione Biosynthesis

Sulfur-induced resistance, also known as sulfur-enhanced defense (SIR/SED) was investigated in Nicotiana tabacum cv. Samsun nn during compatible interaction with Tobacco mosaic virus (TMV) in correlation with glutathione metabolism. To evaluate the influence of sulfur nutritional status on virus infection, tobacco plants were treated with nutrient solutions containing either sufficient sulfate (+S) or no sulfate (−S). Sufficient sulfate supply resulted in a suppressed and delayed symptom development and diminished virus accumulation over a period of 14 days after inoculation as compared with −S conditions. Expression of the defense marker gene PR-1a was markedly upregulated in sulfate-treated plants during the first day after TMV inoculation. The occurrence of SIR/SED correlated with a higher level of activity of sulfate assimilation, cysteine, and glutathione metabolism in plants treated with sulfate. Additionally, two key genes involved in cysteine and glutathione biosynthesis (encoding adenosine 5′-phosphosulfate reductase and γ-glutamylcysteine synthetase, respectively) were upregulated within the first day after TMV inoculation under +S conditions. Sulfate withdrawal from the soil was accelerated at the beginning of the infection, whereas it declined in the long term, leading to an accumulation of sulfur in the soil of plants grown with sulfate. This observation could be correlated with a decrease in sulfur contents in TMV-infected leaves in the long term. In summary, this is the first study that demonstrates a link between the activation of cysteine and glutathione metabolism and the induction of SIR/SED during a compatible plant-virus interaction in tobacco plants, indicating a general mechanism behind SIR/SED.

scholarly journals Genetic Modification of Alternative Respiration Has Differential Effects on Antimycin A-Induced versus Salicylic Acid-Induced Resistance to Tobacco mosaic virus

2003 ◽  
Vol 132 (3) ◽  
pp. 1518-1528 ◽  
Author(s):  
Androulla Gilliland ◽  
Davinder P. Singh ◽  
Jennifer M. Hayward ◽  
Catherine A. Moore ◽  
Alex M. Murphy ◽  
...  
Keyword(s):  
Salicylic Acid ◽  
Tobacco Mosaic Virus ◽  
Mosaic Virus ◽  
Induced Resistance ◽  
Genetic Modification ◽  
Antimycin A ◽  
Alternative Respiration ◽  
Differential Effects

Quantitative Measurements on the Ion Etching of TMV

1973 ◽  
Vol 31 ◽  
pp. 336-337
Author(s):  
Irwin Bendet ◽  
Nabil Rizk
Keyword(s):  
Electron Microscope ◽  
Tobacco Mosaic Virus ◽  
Mosaic Virus ◽  
Ion Current ◽  
Beam Diameter ◽  
Ion Etching ◽  
Preliminary Results ◽  
Quantitative Measurements ◽  
Monitoring Devices

Preliminary results reported last year on the ion etching of tobacco mosaic virus indicated that the diameter of the virus decreased more rapidly at 10KV than at 5KV, perhaps reaching a constant value before disappearing completely.In order to follow the effects of ion etching on TMV more quantitatively we have designed and built a second apparatus (Fig. 1), which incorporates monitoring devices for measuring ion current and vacuum as well as accelerating voltage. In addition, the beam diameter has been increased to approximately 1 cm., so that ten electron microscope grids can be exposed to the beam simultaneously.

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