Identification and Biodegradation Potential of a Novel Strain of Kosakonia oryzae Isolated from a Polyoxyethylene Tallow Amine Paddy Soil.

Polyoxyethylene tallow amine (POEA) is a nonionic surfactant added to insecticide and herbicide formulations. Experimental data have been shown the toxic effects of POEA on aquatic organisms and remain to be a serious concern. In this study, total of thirty-two potential bacteria that were isolated from herbicide-contaminated soil samples showed the ability to use POEA as the sole carbon and energy source. In which, a bacterial strain LA was further investigated based on the efficiency utilization of POEA and classified as Kosakonia oryzae by the 16S rRNA gene. Response surface methodology was successfully applied to understand the interaction of distinct factors on POEA degradation by LA strain. Degradation of POEA was confirmed with UV-Visible spectrophotometric analysis and HPLC analysis. The POEA utilization mechanism was explored by target gene detection and carbon source utilization. The results indicate that strain LA has the potential to serve as an in situ candidate for bioremediation polluted by POEA.