Mohammad Hadi Tardasti; Mehdi Madandoust
Abstract
Objective: In order to investigate the feasibility of plant remediation of cadmium nitrate-contaminated plantings with weeds, a factorial research was conducted in the form of a completely randomized design in 2021-22.
Methods: The experimental factors included weeds (Portulaca oleracea, Chenopodium ...
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Objective: In order to investigate the feasibility of plant remediation of cadmium nitrate-contaminated plantings with weeds, a factorial research was conducted in the form of a completely randomized design in 2021-22.
Methods: The experimental factors included weeds (Portulaca oleracea, Chenopodium album and Amaranthus retroflexus) and the planting substrate factor with cadmium nitrate included zero (control), 25, 50 and 75 mg per soil.
Results: The results showed that with increasing consumption of cadmium nitrate, the amount of cadmium in shoots and roots and biological factor showed an increasing trend. The amount of root cadmium was higher in P.oleracea, but the presence of shoot cadmium in Ch.album and A.retroflexus showed a significant increase compared to P.oleracea. Therefore, in purslane, the transfer of cadmium from the roots to the shoots was probably less than that of Ch.album and A.retroflexus. With the increase of cadmium nitrate, ion leakage showed a growth trend and a relative decrease in leaf water and chlorophyll. On the other hand, the enzyme catalase and ascorbate peroxidase of leaves showed an increasing trend with increasing consumption of cadmium nitrate. Also, the highest activity of antioxidant enzymes was observed in A.retroflexus weeds.
Conclusion: Generally, with the mentioned characteristics, it is possible to consider P.oleracea plant more than the accumulator and Ch.album and A.retroflexus among the accumulators for cadmium metal.