Abstract
Enterobacter sp. DMKU-RP206 was isolated from rice leaves in Thailand and identified by the 16S rRNA gene and multilocus sequence (gyrB, rpoB, atpD, and infB genes) analysis. The bacterium was assessed on plant growth-promoting traits including indole-3-acetic acid (IAA) production. Phosphate solubilization, ammonia production, and antagonism to fungal plant pathogens, as well as siderophore production, were shown by this bacterium. However, only IAA production was focused on. The production of IAA by Enterobacter sp. DMKU-RP206 was optimized by statistical methods. A Box–Behnken design was used for the investigation of interactions among the basic influencing factors and for the optimization of IAA production. The results showed that l-tryptophan had a significant importance in terms of IAA production. Enterobacter sp. DMKU-RP206 produced a higher amount of IAA than previously reported for the genus Enterobacter. 0.85% of lactose as a carbon source, 1.3% of yeast extract as a nitrogen source, 1.1% of l-tryptophan as a precursor, 0.4% of NaCl, an initial pH of 5.8, an incubation temperature at 30 °C, and a shaking speed of 200 rpm were found to be the optimum conditions for IAA production. In addition, IAA production was performed to scale up IAA production, and the highest amount, 5561.7 mg l−1, was obtained. This study reported a 13.4-fold improvement in IAA production by Enterobacter sp. DMKU-RP206.
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This work was supported by the Higher Education Research Promotion and National Research University Project of Thailand, Office of the Higher Education Commission.
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Nutaratat, P., Monprasit, A. & Srisuk, N. High-yield production of indole-3-acetic acid by Enterobacter sp. DMKU-RP206, a rice phyllosphere bacterium that possesses plant growth-promoting traits. 3 Biotech 7, 305 (2017). https://doi.org/10.1007/s13205-017-0937-9
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DOI: https://doi.org/10.1007/s13205-017-0937-9