Succulent species differ substantially in their tolerance and phytoextraction potential when grown in the presence of Cd, Cr, Cu, Mn, Ni, Pb, and Zn
journal contributionposted on 06.01.2021, 01:03 by C Zhang, Peter SalePeter Sale, Gary ClarkGary Clark, W Liu, AI Doronila, SD Kolev, Caixian TangCaixian Tang
© 2015, Springer-Verlag Berlin Heidelberg. Plants for the phytoextraction of heavy metals should have the ability to accumulate high concentrations of such metals and exhibit multiple tolerance traits to cope with adverse conditions such as coexistence of multiple heavy metals, high salinity, and drought which are the characteristics of many contaminated soils. This study compared 14 succulent species for their phytoextraction potential of Cd, Cr, Cu, Mn, Ni, Pb, and Zn. There were species variations in metal tolerance and accumulation. Among the 14 succulent species, an Australian native halophyte Carpobrotus rossii exhibited the highest relative growth rate (20.6–26.6 mg plant−1 day−1) and highest tolerance index (78–93 %), whilst Sedum “Autumn Joy” had the lowest relative growth rate (8.3–13.6 mg plant−1 day−1), and Crassula multicava showed the lowest tolerance indices (<50 %). Carpobrotus rossii and Crassula helmsii showed higher potential for phytoextraction of these heavy metals than other species. These findings suggest that Carpobrotus rossii is a promising candidate for phytoextraction of multiple heavy metals, and the aquatic or semiterrestrial Crassula helmsii is suitable for phytoextraction of Cd and Zn from polluted waters or wetlands.
We thank the Royal Botanic Gardens Victoria for supplying Sedum species, Dr. Trevor Edwards for the identification of plant species, and Mr. Rob Evans for assistance in the experiment. We also thank two anonymous reviewers for constructive comments. This research was supported by the Australian Research Council Linkage Grant LP100100800.
JournalEnvironmental Science and Pollution Research
Pagination15p. (p. 18824-18838)
PublisherSpringer Verlag (Germany)
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Science & TechnologyLife Sciences & BiomedicineEnvironmental SciencesEnvironmental Sciences & EcologyHalophyteMultiple heavy metalsPhytoremediationSedumSpecies variationToleranceBRASSICA-JUNCEA L.HEAVY-METALSCADMIUM TOLERANCEINDIAN MUSTARDCO-TOLERANCEACCUMULATIONZINCSOILPHYTOREMEDIATIONPLANTSAizoaceaeMetals, HeavySoil PollutantsAustraliaWetlandsEnvironmental Restoration and Remediation