تلخیص
Toxic level of cadmium (Cd) has been built up in soil profile due to over fertilization, industrial
activities and irrigation with city wastewater. One of the remediation strategies of such contaminated
soil is phytoextraction by using hyper-accumulator plants. Metal stress hinders plant growth in
contaminated soils even hyper-accumulator plant cannot attain sufficient biomass for effective
phytoremediation. Plant growth promoting bacteria and auxin help plants to cope with metal stress. A
pot experiment was conducted where the efficacy of four different Cd tolerant bacterial isolates alone
and in combination with auxin (10-3 M) was evaluated to promote spinach growth in Cd contaminated
soil. Results revealed that Cd contamination severely decreased the spinach growth. However,
bacterial inoculation and auxin application improved the spinach growth and Cd uptake compared to
control. But combined application of bacterial isolates and auxin was more pronounced for enhancing
fresh and dry mass, and phytoextraction of Cd. Bacterial inoculation along with auxin increased the
fresh and dry weight up to 261 and 45%, respectively, over control. Moreover, combined use of
bacteria and auxin also enhanced the uptake of Cd by spinach up to 5.36 folds compared to control.
Thus, synergistic use of bacteria and auxin could be a novel approach for improving plant growth
under metals stress as well as for meaningful phytoremediation of metals contaminated soils.
Tariq Ali, Sajid Mahmood, Muhammad Yahya Khan, Ana Aslam, Muhammad Baqir Hussain, Hafiz Naeem Asghar, Muhammad Javed Akhtar. (2013) PHYTOREMEDIATION OF CADMIUM CONTAMINATED SOIL BY AUXIN ASSISTED BACTERIAL INOCULATION, Asian Journal of Agriculture and Biology, Volume 1, Issue 2.
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