The application of copper nanoparticles and Potassium silicate (cas 1312-76-1) stimulate the tolerance to Clavibacter michiganensis in tomato plants

Add time:08/16/2019    Source:sciencedirect.com

The damage by Clavibacter michiganensis in the tomato plants is of great economic importance worldwide due to the significant losses it generates in the crop. The advances in nanotechnology provide alternatives that can be applied in the control of pathogens. Nano-copper and silicon currently have a widespread use for the control of plant pathogens. The combined use of both is expected to have a synergistic effect on the tolerance of plants against pathogens. The objective of the present research was to determine the effect of the application of copper nanoparticles and Potassium silicate (cas 1312-76-1) on tolerance to C. michiganensis in tomato. The presence, severity, and the impact of the bacteria on the yield of the tomato crop were determined. Levels of activity of defense enzymes were determined as well as antioxidant compounds in the leaves and fruits of tomato to understand the changes at the biochemical level caused by the bacteria and by the treatments. The results showed that the application of copper nanoparticles and potassium silicate was effective in reducing the severity of C. michiganensis. Also, the loss of yield due to the bacteria was reduced in 16.1%. The biochemical analyzes showed that the application of copper nanoparticles and potassium silicate positively modified the activity of the enzymes SOD, PAL, GPX, and APX, as well as the concentration of reduced glutathione and total phenols in the leaves. The activity of the PAL and GPX enzymes, as well as the contents of lycopene and β-carotene, were elevated in the fruits. The joint application of copper nanoparticles and potassium silicate changed the levels of enzymatic and non-enzymatic compounds that are key in defense of tomato plants, increasing the tolerance to C. michiganensis.

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