Australian native plant species Carpobrotus rossii (Haw.) Schwantes shows the potential of cadmium phytoremediation
journal contributionposted on 2021-01-06, 01:02 authored by C Zhang, Peter SalePeter Sale, AI Doronila, Gary ClarkGary Clark, C Livesay, Caixian TangCaixian Tang
Many polluted sites are typically characterized by contamination with multiple heavy metals, drought, salinity, and nutrient deficiencies. Here, an Australian native succulent halophytic plant species, Carpobrotus rossii (Haw.) Schwantes (Aizoaceae) was investigated to assess its tolerance and phytoextraction potential of Cd, Zn, and the combination of Cd and Zn, when plants were grown in soils spiked with various concentrations of Cd (20-320 mg kg-1 Cd), Zn (150-2,400 mg kg-1 Zn) or Cd + Zn (20 + 150, 40 + 300, 80 + 600 mg kg-1). The concentration of Cd in plant parts followed the order of roots > stems > leaves, resulting in Cd translocation factor (TF, concentration ratio of shoots to roots) less than one. In contrast, the concentration of Zn was in order of leaves > stems > roots, with a Zn TF greater than one. However, the amount of Cd and Zn were distributed more in leaves than in stems or roots, which was attributed to higher biomass of leaves than stems or roots. The critical value that causes 10 % shoot biomass reduction was 115 μg g-1 for Cd and 1,300 μg g-1 for Zn. The shoot Cd uptake per plant increased with increasing Cd addition while shoot Zn uptake peaked at 600 mg kg-1 Zn addition. The combined addition of Cd and Zn reduced biomass production more than Cd or Zn alone and significantly increased Cd concentration, but did not affect Zn concentration in plant parts. The results suggest that C. rossii is able to hyperaccumulate Cd and can be a promising candidate for phytoextraction of Cd from polluted soils. © 2014 Springer-Verlag Berlin Heidelberg.
We thank Dr. Trevor Edwards for the identification of Carpobrotus rossii and Mr. Rob Evans for assistance in the experiment. We are grateful to an anonymous reviewer for constructive and detailed comments on the manuscript. This research was supported by an Australian Research Council Linkage Project (LP100100800).
JournalEnvironmental Science and Pollution Research
Pagination9p. (p. 9843-9851)
PublisherSpringer Verlag (Germany)
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Science & TechnologyLife Sciences & BiomedicineEnvironmental SciencesEnvironmental Sciences & EcologyCadmium(Cd)HyperaccumualtorMetal contaminationSucculentToleranceZinc (Zn)HYPERACCUMULATOR ARABIDOPSIS-HALLERIHEAVY-METAL ACCUMULATIONTHLASPI-CAERULESCENSZINCTOLERANCECDSOILZNTRANSLOCATIONPOPULATIONSAizoaceaeCadmiumAustraliaBiodegradation, Environmental