期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 311, 期 -, 页码 63-69出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2016.02.053
关键词
Lead soil pollution; Bidens pilosa; Tagetes minuta; Phytohormones; Root exudates
资金
- Secretaria de Ciencia y Tecnica de la Universidad Nacional de Cordoba (SECYT-UNC)
- Agencia Nacional de Promocion Cientifica y Tecnologica Fondo para la Investigacion Cientifica y Tecnologica FONCyT [PICT-2342]
- Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET)
The principal impediment for Pb uptake by plants is the Casparian strip in roots. It prevents metals reaching the xylem, thereby hampering translocation to the aerial organs. In the root apices, young root cells have thin cell walls and the Casparian strip is not completely developed, which could facilitate Pb uptake by roots at these vulnerable points. However, as the phytotoxic effects of Pb reduce root growth and enhance suberization, entry of Pb into the plant is avoided. We propose that the application of root growth promotors could be an important complement in the phytoextraction of Pb from polluted soils, due to their effects on produced biomass, Pb toxicity, and root exudate production. A greenhouse experiment was carried on to evaluate the auxin application effect on the Pb uptake of Bidens pilosa and Tagetes minuta. These species were sensitive to auxins, but the phytotoxic effect of Pb was not reversed by this treatment. Root exudates capable of extracting Pb were produced only when the species were grown in highly polluted soils, indicating a behavioral response to Pb exposure which is desirable for phytoremediation. (C) 2016 Elsevier B.V. All rights reserved.
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