Crosstolerant Effect of Salt Priming and Viral Infection on Nicotiana Benthamiana

Currently, the salinization of soil one of the factors, which determine the productivity of crop plants. Under severe conditions, plants reveal the retardation in growth of shoots and roots,the decrease of productivity, because of biochemical and physiologicaleffects of salt high concentrations. To avoid any severe effect of biotic and abiotic stress is applied to the method of seed priming. Primed seed preserves the resistance signaling pathway for upcoming stress conditions. During biotic and biotic stress firstly accumulates reactive oxygen species which are the secondary messenger molecules in many signaling pathway of plant organisms. Excessive amounts of reactive oxygen species lead to macromolecules damage, such as lipids of cell walls, proteins, nucleic acids. To overcome the severe effect, plants evolved enzymatic and non-enzymatic systems of protection. The crucial enzymes are catalase, aldehyde oxidase, superoxide dismutase. The main components of the non-enzymatic antioxidant system are vitamins, low molecular mass substances such as glutathione. The phenomenon “cross-tolerance” suggests the resistance of plant organism to one stress by the exposure to another one. Early exposure salt stress to Nicotiana benthamiana leads to resistance to viral infection, change the activity of antioxidant enzymes (catalase, aldehyde oxidase). The analysis of viral particles revealed the decrease of viral particles content in salt primed plants.