Document Type : Research Paper
Lead is one of the most important environmental pollutants which disturbed nutrient uptake by plant. Present study was conducted with the aim of evaluation of some biotic factors potential in lead (Pb) phytoremediation and nutrient uptake by eucalyptus in Pb-contaminated soil. Treatments include three levels of bacteria (B0, Ba105 and Ps36), two levels of mycorrhiza (M0 and M1) and three levels of Pb (0, 50 and 100 mg/kg). Bacterial isolates were pseudomonas and bacillus and fungi was glomus moseae. Results showed that increasing in soil Pb concentration improved Pb uptake by plants. Inoculation with Ba105 caused significant increase in shoot Pb uptake and this treatment caused in 55 and 19.5% increase in Pb uptake compared to control (without inoculation) and inoculation with pseudomonas Ps36. Also, mycorrhizal inoculation resulted in 23.7 and 44% increase in shoot and root Pb uptake compared to control. The greatest phosphorous uptake occurred in 0 mg/kg Pb. As Pb concentration in soil is increased, shoot and root phosphorous uptake by eucalyptus significantly. Inoculations with Ps36 and Ba105 along with mycorrhiza caused increase in shoot and root phosphorus and potassium uptake. Association of soil beneficial microorganisms (bacteria and fungi) with fast-growing and high biomass producer tree species like eucalyptus could cause improvement in phytoremediation efficiency under heavy metal stress.