137Cs sensitivity test of endophytic bacterium ELP04 associated with Echeveria laui

Nuclear power station accidents or nuclear weapons explosions release radioactive material into the environment. Remediation process, especially microorganism-mediated, could be an eco-friendly alternative. The present work delineates 137Cs sensitivity test employing an endophytic bacterium by monitoring colony-forming units counts. Gamma-radiation experiments was performed using gamma rays emitted from 137Cs source (50mCi activity) a distance of 0,07 m during 24h and 48h, with final doses 0,72 Gy and 1,45 Gy, respectively. It was observed no significant difference gamma-radiation process during 24h with bacterial cells entered in a growth restricted state (2,06 Log CFU.mL-1). Nevertheless, cell divisions increased for the period of 48h gamma-radiation exposure (6,05 Log CFU.mL-1). Based on colony-forming, our findings indicate 137Cs resistance during the gamma-process by ELP04, when compared to the control without exposure. Studying bacterial gamma radiation exposure, could contribute for a better understanding its ability to remediation radionuclides in contaminated sites.