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Re-investigation of cadmium accumulation in Mirabilis jalapa L.: evidences from field and laboratory

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Abstract

Mirabilis jalapa L. was identified as a cadmium (Cd) hyperaccumulator, but data were mainly from laboratory conditions. The main aim of the present study was to confirm whether M. jalapa is a Cd hyperaccumulator by field survey and laboratory experiment. The field survey was conducted at 3 sites and 66 samples were collected, and the results showed that although M. jalapa did not exhibit any visible damage when growing on soil containing 139 mg Cd kg−1, a low concentration of Cd (11.85 ± 3.45 mg kg−1) in its leaves was observed. Although the translocation factor (TF) was up to 3.24 ± 0.42, the bioconcentration factor (BCF) was only 0.13 ± 0.07. The Cd accumulation in leaves of Lanping (LP, contaminated site) and Kunming (KM, clean site) populations reached 93.88 and 81.76 mg kg−1 when artificially spiked soil Cd was 175 mg kg−1, respectively. The BCFs of LP and KM populations were 0.55 and 0.48, and the TFs of the two populations were 3.98 and 4.15, respectively. Under hydroponic condition, the Cd concentration in young leaves of LP and KM populations was 78.5 ± 0.8 and 46.3 ± 1.2 mg kg−1 at 5 mg L−1 Cd treatment, respectively. Furthermore, a significantly positive correlation between tissue Cd concentration and total Cd, CaCl2-extractable Cd, and TCLP-Cd (toxicity characteristic leaching procedure) in soil was established. Therefore, M. jalapa had constitutional characteristics for Cd tolerance and accumulation, but it was not a Cd hyperaccumulator.

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Abbreviations

ANOVA:

Analysis of variance

BCF:

Bioconcentration factor

Cd:

Cadmium

HMs:

Heavy metals

IARC:

International Agency for Research on Cancer

PAHs:

Polycyclic aromatic hydrocarbons

TCLP:

Toxicity characteristic leaching procedure

TF:

Translocation factor

TI:

Tolerance index

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Funding

This work was supported by National Natural Science Foundation of China (31960264) and Analyze and Test Foundation of Kunming University of Science and Technology, China (2017P20161107010).

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Correspondence to Hongbin Wang.

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Responsible editor: Elena Maestri

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Li, Q., Wang, H., Wang, H. et al. Re-investigation of cadmium accumulation in Mirabilis jalapa L.: evidences from field and laboratory. Environ Sci Pollut Res 27, 12065–12079 (2020). https://doi.org/10.1007/s11356-020-07785-6

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  • DOI: https://doi.org/10.1007/s11356-020-07785-6

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