Antibacterial effect of ethanolic extract of Zataria multiflora and Carum carvi on factors affecting pathogenicity of Pectobacterium carotovorum subsp. caratovorum

Document Type : Short Article

Authors

1 Department of Plant Pathology, Collage of Science, Agriculture and Modern Technology, Shiraz Branch, Islamic Azad University, Shiraz, Iran

2 Department of Plant Pathology, College of Science, Agriculture and Modern Technology, Shiraz Branch, Islamic Azad University, Shiraz, Iran

Abstract

Pectobacterium carotovorum is the causative agent of potato soft rot. The aim of this study was to find an effective and safe solution to reduce the damage of this disease. The antibacterial effect of ethanolic extract of  two medicinal plants i.e. thyme and black cumin on the pathogenic factors of P. carotovorum was investigated in a completely randomized design and the factors of inhibition zone diameter, inhibition percentage, biofilm, hydrophobic effect, adhesion on the potato tuber and motility of bacteria were measured and analyzed. The results showed that the maximum diameter of the inhibition zone due to the use of thyme extract was 9.66 mm. Also, thyme plant extract had a significant effect on the inhibitory percentage of P. carotovorum in the potato tuber by 87.46% and reduced the symptoms of the disease on the potato tuber. Effects of thyme and black cumin extracts on the other pathogenic factors were the same and both extracts showed statistically significant differences with the control. It seems that thyme extract had more antibacterial properties and because of inhibition of motility of bacteria caused significant control of the disease on the potato tubers. According to the results of this study, the use of effective compounds of thyme extract to control soft rot disease of potato tuber, especially during storage is recommended.
 

Keywords


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