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Chemosphere. 2014 Jun;104:15-24. doi: 10.1016/j.chemosphere.2013.09.079. Epub 2013 Nov 21.

Accumulation of heavy metals using Sorghum sp.

Author information

1
Laboratory of Plant Biotechnologies, Institute of Experimental Botany AS CR, v.v.i., Rozvojová 263, 165 02 Prague 6 - Lysolaje, Czech Republic.
2
Laboratory of Hormonal Regulations in Plants, Institute of Experimental Botany AS CR, v.v.i., Rozvojová 263, 165 02 Prague 6 - Lysolaje, Czech Republic.
3
Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, No. 71 East Beijing Road, 210008 Nanjing, China.
4
Laboratory of Plant Biotechnologies, Institute of Experimental Botany AS CR, v.v.i., Rozvojová 263, 165 02 Prague 6 - Lysolaje, Czech Republic. Electronic address: vanek@ueb.cas.cz.

Abstract

The essential requirement for the effective phytoremediation is selection of a plant species which should be metal tolerant, with high biomass production and known agronomic techniques. The above mentioned criteria are met by crop plant sorghum (Sorghum bicolor). The response of hydroponically grown S. bicolor plants to cadmium and zinc stress was followed. The impact of metal application on physiological parameters, including changes in chlorophylls contents and antioxidative enzymes activities, was followed during the stress progression. Cadmium and zinc were accumulated primarily in the roots of sorghum plants. However, elevation of metal concentrations in the media promoted their transfer to the shoots. Toxic effects of metals applied at lower concentrations were less serious in the shoots in comparison with their influence to the roots. When applied at higher concentrations, transfer of the metals into the leaves increased, causing growth reduction and leading to Chl loss and metal-induced chlorosis. Moreover, higher metal levels in the roots overcame the quenching capacity of peroxidase and glutathione transferase, which was associated with reduction of their activities. Fortification of antioxidant system by addition of glutathione significantly increased the accumulation of cadmium in the roots as well as in the shoots at the highest cadmium concentration applied.

KEYWORDS:

Accumulation; Cadmium; Oxidative stress; Sorghum; Zinc

[Indexed for MEDLINE]

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