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Effects of Ca addition on the uptake, translocation, and distribution of Cd in Arabidopsis thaliana
- Source :
- Ecotoxicology and Environmental Safety; 139, pp 228-237 (2017)
- Publication Year :
- 2017
- Publisher :
- Elsevier, 2017.
-
Abstract
- Cadmium (Cd) pollution poses a risk to human health for its accumulation in soil and crops, but this can be alleviated by calcium (Ca) addition. However, its mechanism remains unclear yet. In this study, Arabidopsis thaliana was used to explore the alleviating effects of Ca on Cd toxicity and its specific function during uptake, upward-translocation, and distribution of Cd. Supplementing plants with 5 mM CaCl2 alleviated the intoxication symptoms caused by 50 μM CdCl2, such as smaller leaves, early bolting and root browning. Ca addition decreased uptake of Cd, possibly by reducing the physical adsorption of Cd since the root cell membrane was well maintained and lignin deposition was decreased as well, and by decreasing symplastic Cd transport. Expression of the genes involved (AtZIP2 and AtZIP4) was also decreased. In addition, Ca accumulated in the plant shoot to help facilitating the upward-translocation of Cd, with evidence of higher translocation factor and expression of genes that were involved in Ca transport (AtPCR1) and Cd xylem loading (AtHMA2 and AtHMA4). Dithizone-staining of Cd in leaves showed that in Cd+Ca-treated plants, Ca addition initially protected the leaf stomata by preventing Cd from entering guard cells, but with prolonged Cd treatment facilitated the Cd accumulation around trichomes and maybe its excretion. We conclude that Ca promotes the upward-translocation of Cd and changes its distribution in leaves. The results may have relevance for bioremediation.
- Subjects :
- 0106 biological sciences
Alleviating effect
Health, Toxicology and Mutagenesis
Arabidopsis
Environmental Health and Occupational Health
chemistry.chemical_element
Gene Expression
Chromosomal translocation
010501 environmental sciences
Biology
Calcium
Cd toxicity
01 natural sciences
Plant Roots
Exogenous Ca
Xylem
Guard cell
Botany
Arabidopsis thaliana
Cation Transport Proteins
0105 earth and related environmental sciences
Adenosine Triphosphatases
Cadmium
Cd uptake and translocation
Arabidopsis Proteins
fungi
Public Health, Environmental and Occupational Health
food and beverages
Biological Transport
General Medicine
biology.organism_classification
Pollution
Trichome
Cell biology
Plant Leaves
Cd distribution
chemistry
Shoot
Environmental Sciences
010606 plant biology & botany
Subjects
Details
- Language :
- English
- ISSN :
- 01476513
- Database :
- OpenAIRE
- Journal :
- Ecotoxicology and Environmental Safety; 139, pp 228-237 (2017)
- Accession number :
- edsair.doi.dedup.....38285cf6d5a5cc8f703be09b283d55e5