Evaluation of the role of plant growth-promoting bacteria in biological control of Salmonella typhimurium pathogen

Articles in Press

Document Type : Research Paper

Authors

1 Department of Soil science, Faculty of Agriculture, Shahid Chamran University of Ahvaz, Ahvaz, Iran.

2 Department of Soil Science, Faculty of Agriculture, Shahid Chamran University of Ahvaz, Ahvaz, Iran

3 Department of Nanotechnology, Agricultural Biotechnology Research Institute of Iran (ABRII), Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran

Abstract

Human pathogens such as Salmonella enter agricultural soils from various sources. Salmonella is one of the most common food-borne microorganisms and is a causative agent of infections shared between humans and animals. In this study, some plant growth-promoting bacteria were used to control the pathogen Salmonella typhimurium. The results showed that Bacillus rugosus CS5, Bacillus vallismortis AS4, Priestia aryabhattai CL1 and Bacillus sp. SS4, had the highest inhibitory effect on the optical density of Salmonella in liquid medium. B. vallismortis AS4, B. rugosus CS5, P. aryabhattai CL1 and Bacillus sp. SS4 exhibited the greatest inhibition of this pathogen's growth in solid medium.The bacteria were capable of producing siderophore. The highest protease production index belonged to P. aryabhattai CL1 and B. rugosus CS5, respectively. B. vallismortis AS4 was capable of producing lipase. Both P. aryabhattai strain CL1 and B. rugosus strain CS5 had the ability to produce HCN. The impact of each bacteria and a microbial consortium on the Salmonella population in soil was investigated. The results showed that Salmonella population decreased 15 days after inoculation due to the treatments. The greatest reduction in population was attributed to the microbial consortium and the Bacillus sp. strain SS4 treatment, with population values of 228.43×103 and 40.30×103CFU/g, respectively. The findings indicate a positive effect of plant growth-promoting bacteria in soil for controlling S. typhimurium, which could reduce the negative impacts of the pathogen's presence in soil, thereby enhancing human health and food security.

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Iranian Journal of Soil and Water Research

Articles in Press, Accepted Manuscript
Available Online from 02 December 2024

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