scholarly journals Host Plant Resistance to Pathogen with Reference to Induction of Systemic Acquired Resistance (SAR) in Tobacco (Nicotiana Tabacum Var. Samsun) When Infected with Tobacco Mosaic Virus (TMV)

2008 ◽  
Vol 2 (2) ◽  
Author(s):  
F Mariame ◽  
A Kvarnheden ◽  
A Vuorinen
Keyword(s):  
Nicotiana Tabacum ◽  
Tobacco Mosaic Virus ◽  
Host Plant ◽  
Mosaic Virus ◽  
Plant Resistance ◽  
Host Plant Resistance ◽  
Systemic Acquired Resistance ◽  
Acquired Resistance

scholarly journals Sulfated Fucan Oligosaccharides Elicit Defense Responses in Tobacco and Local and Systemic Resistance Against Tobacco Mosaic Virus

2003 ◽  
Vol 16 (2) ◽  
pp. 115-122 ◽  
Author(s):  
Olivier Klarzynski ◽  
Valérie Descamps ◽  
Bertrand Plesse ◽  
Jean-Claude Yvin ◽  
Bernard Kloareg ◽  
...  
Keyword(s):  
Tobacco Mosaic Virus ◽  
Mosaic Virus ◽  
Systemic Acquired Resistance ◽  
Acquired Resistance ◽  
Defense Responses ◽  
Systemic Resistance ◽  
Extracellular Medium ◽  
Sulfated Fucan ◽  
Strong Stimulation ◽  
Local And Systemic Resistance

Sulfated fucans are common structural components of the cell walls of marine brown algae. Using a fucan-degrading hydrolase isolated from a marine bacterium, we prepared sulfated fucan oligosaccharides made of mono- and disulfated fucose units alternatively bound by α-1,4 and α-1,3 glycosidic linkages, respectively. Here, we report on the elicitor activity of such fucan oligosaccharide preparations in tobacco. In suspension cell cultures, oligofucans at the dose of 200 μg ml−1 rapidly induced a marked alkalinization of the extracellular medium and the release of hydrogen peroxide. This was followed within a few hours by a strong stimulation of phenylalanine ammonia-lyase and lipoxygenase activities. Tobacco leaves treated with oligofucans locally accumulated salicylic acid (SA) and the phytoalexin scopoletin and expressed several pathogenesis-related (PR) proteins, but they displayed no symptoms of cell death. Fucan oligosaccharides also induced the systemic accumulation of SA and the acidic PR protein PR-1, two markers of systemic acquired resistance (SAR). Consistently, fucan oligosaccharides strongly stimulated both local and systemic resistance to tobacco mosaic virus (TMV). The use of transgenic plants unable to accumulate SA indicated that, as in the SAR primed by TMV, SA is required for the establishment of oligofucan-induced resistance.

scholarly journals Control of Tobacco mosaic virus by PopW as a Result of Induced Resistance in Tobacco Under Greenhouse and Field Conditions

2011 ◽  
Vol 101 (10) ◽  
pp. 1202-1208 ◽  
Author(s):  
Jian-Gang Li ◽  
Jing Cao ◽  
Fei-Fei Sun ◽  
Dong-Dong Niu ◽  
Fang Yan ◽  
...  
Keyword(s):  
Tobacco Mosaic Virus ◽  
Mosaic Virus ◽  
Systemic Acquired Resistance ◽  
Acquired Resistance ◽  
Field Trials ◽  
Tobacco Leaves ◽  
Biocontrol Efficacy ◽  
Development Of Resistance ◽  
Pathogenesis Related ◽  
Harpin Protein

In a previous study, we isolated a new harpin protein, PopW, from the bacterium Ralstonia solanacearum ZJ3721 that can induce a hypersensitive response in tobacco, Nicotiana tabacum, leaves. In the current study, we demonstrate that, in a greenhouse experiment, PopW induced tobacco-acquired resistance against the Tobacco mosaic virus (TMV) with a biocontrol efficacy of 80.9 to 97.4% at a concentration as low as 25 μg/ml in both PopW-treated and neighboring leaves. The resistance induced by PopW is systemic acquired resistance mediated by salicylic acid, which was certified by the development of resistance being accompanied by the expression of the pathogenesis-related-1 gene (PR1) 8 h after PopW was sprayed onto the tobacco leaves. In addition, hydrogen peroxide began to accumulate 10 h after PopW spraying, peaking at 24 h with a maximum concentration of 1.97 μM/g fresh weight. The activities of phenylalanine ammonia lyase (EC4.3.1.5), polyphenoloxidase (EC1.14.18.1), and peroxidase (EC1.11.1.7) also increased, peaking at different times in the PopW-treated tobacco leaves. PopW also reduced the level of TMV disease in field trials with a biocontrol efficacy of 45.2%. Furthermore, PopW both increased tobacco yield (by 30.4 more than in control plants) and improved tobacco foliar quality, with an increase of 50.2% in the number of first-class tobacco leaves from treated compared with untreated plants. All of these results indicate that the new harpin protein PopW has the potential to be an effective biocontrol agent against TMV in tobacco.

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