Abstract
Disease in agricultural field is a big problem that causes a massive loss in production. In this present investigation, we have reported a soil-borne bacterium Bacillus cereus IB311 which is antagonistic to plant pathogens (Pseudomonas syringae and Agrobacterium tumefaciens), and could make a substantial contribution to the prevention of plant diseases. To prove the practical application, the strain was directly applied in agricultural field. The results demonstrated that B. cereus IB311 has increased the production (20% and 26% in term of average pod number per plant, average seed number per pod, and seed yield per experimental plot) in ground nut (Arachis hypogaea var. Koushal, G201) and sesame (Sesamum indicum var. Kanak), respectively. To reduce the production cost, the biomass production was optimized through response surface methodology (RSM). Interactions of three variables (glucose, beef extract and inoculum) were studied using Central Composite Design. According to our analysis, optimum production of Bacillus cereus IB311 (5.383 µg/ mL) may be obtained at glucose 1.985%, beef extract 1.615% and inoculums size 0.757%. Therefore, we strongly believe that the application of this strain in agricultural field as bio-controlling agent will definitely enhance the production yield and will reduce the disease risk.
Highlights
Plants harbor a wide range of bacteria, which may be beneficial or pathogenic
Many plant bacterial phytopathogens have been identified such as Agrobacterium tumefaciens, Dickeya, Erwinia amylovora, Pectobacterium carotovorum, Pseudomonas syringae, Ralstonia solanacearum, Xanthomonas oryzae, Xanthomonas campestris, Xanthomonas axonopodis and Xylella fastidiosa
The highest zone of inhibition was recorded against P. syringae
Summary
Plants harbor a wide range of bacteria, which may be beneficial or pathogenic. The types of interactions include mutualism, proto-cooperation, commensalism, neutralism, competition, amensalism, parasitism and predation (Bull and Koike 2015). Plant disease is an impairment of the normal state of a plant that interrupts or modifies its vital functions. Many plant bacterial phytopathogens have been identified such as Agrobacterium tumefaciens, Dickeya (dadantii and solani), Erwinia amylovora, Pectobacterium carotovorum, Pseudomonas syringae, Ralstonia solanacearum, Xanthomonas oryzae, Xanthomonas campestris, Xanthomonas axonopodis and Xylella fastidiosa. All species of plants are subject to bacterial disease. The occurrence and prevalence of bacterial plant diseases vary time to time, depending on the presence of the
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