Abstract
Green leafy vegetables are rich sources of antioxidants and minerals, which prevent food-borne pathogen infections during our diet. This study was aimed to isolate and identify the plant growth-promoting endophytic bacterium from several plant species to enhance the growth of Amaranthus polygonoides L. and their antimicrobial potential against food-borne pathogens. Seven endophytic bacterial isolates were tested on two Amaranthus species to identify the suitable beneficial bacterium. The antioxidants capacity and antimicrobial activity of bacterial isolate (APL3) treated plants were analyzed. The bacterial isolate, APL3 showed a significantly higher growth of A. polygonoides L. than other isolates. It was identified as Paenibacillus dendritiformis strain APL3 by 16S rRNA gene sequencing and phylogenetic analysis. The endophyte (APL3) treated A. polygonoides L. sprouts had higher antioxidants potentials and significantly inhibited the growth of Escherichia coli, Salmonella sp., Staphylococcus sp. and Pseudomonas sp. The results of the present study suggest that utilization of P. dendritiformis strain APL3 triggers the growth of A. polygonoides L. and induces metabolic changes in plants to improve their antimicrobial properties to prevent foodborne pathogens.
Highlights
The food contains a lot of nutrients and microorganisms, and those microorganisms are friends or foes to humans and other organisms [1]
The results of the present study suggest that utilization of P. dendritiformis strain APL3 triggers the growth of A. polygonoides L. and induces metabolic changes in plants to improve their antimicrobial properties to prevent foodborne pathogens
Plant growth-promoting bacteria alter the physiological changes in plants to enhance plant growth [19]
Summary
The food contains a lot of nutrients and microorganisms, and those microorganisms are friends or foes to humans and other organisms [1]. The anthropogenic activities including sewage disposal to water bodies and improper maintenance of water tanks are the sources of water-borne diseases [2]. Food-borne diseases are a major health issue worldwide and reduce national economies [3]. The microbial contaminated food and drinking water cause several diseases including diarrhea, typhoid, cholera, salmonellosis and hepatitis A. Escherichia coli, Salmonella spp., Staphylococcus spp. and Pseudomonas are common food-borne pathogens that infect the human populations. The physicians are suggesting antibiotic drugs to cure the disease. The misuse or overuse of those drugs will not be effective to control the pathogen growth due to antibiotic resistance [4]. The antimicrobial potential of plant extracts would be an alternative to synthetic drugs to prevent diseases and defeat antibiotic resistance [5]
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