The Influence Factors on Growth and Cadmium-Resistance of a P. aeruginosa Strain

Bioremediation of heavy metals pollution by microorganism has attracted more attention. The influence factors on growth and cadmium-resistance of P. aeruginosa E1 were investigated.The results showed that the multiplication of the strain was inhibited and the pigment could not be produced in cadmium medium.FTIR analysis implied that cadmium could bound to and inactive groups of the pigment synthesis enzyme.The appropriate culture conditions were at 25-35°C, initial pH 6-7, and 80-100 mL liquid in 250 mL flask.50 mg/L of other five heavy metals caused varied effect on the strain. Cultured in no-cadmium medium, Zn and Mn were helpful, Pb and Co present inhibition to the strain. Cultured in cadmium medium, Cu, Zn, and Mn had no inhibition, and the others would interfere the growth. The culture conditions of the strain were common, which would avail the mass produce for application in remediation.