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1.
Bull Environ Contam Toxicol ; 108(4): 762-767, 2022 Apr.
Article in English | MEDLINE | ID: mdl-34997262

ABSTRACT

This study aimed to investigate the effects of drought stress on cadmium (Cd) and zinc (Zn) accumulation in Chromolaena odorata grown in an artificially contaminated nutrient solution for 15 days. Polyethylene glycol (5% PEG) was used as a drought stressor. The presence of PEG did not affect the chlorophyll content and photochemical efficiency, while drought stress induced by PEG caused a decrease in water content in the plant tissues. The bioaccumulation factor (BAF) of Cd were higher than the BAF of Zn and accumulated mainly in the roots of C. odorata. The highest concentrations (4273.7 mg/kg Cd, 2135.4 mg/kg Zn) were found in the 20 mg/L treatment. The results suggested that Cd and Zn accumulation in C. odorata was not affected by PEG, while a translocation factor (TF) value < 1 was caused by either PEG or contaminants. Based on the hydroponic BAF criterion, the study confirmed that C. odorata was useful for phytoremediation of Cd with low drought stress.


Subject(s)
Chromolaena , Metals, Heavy , Soil Pollutants , Biodegradation, Environmental , Cadmium/analysis , Cadmium/toxicity , Droughts , Hydroponics , Metals, Heavy/analysis , Metals, Heavy/toxicity , Plant Roots/chemistry , Soil Pollutants/analysis , Soil Pollutants/toxicity
2.
Int J Phytoremediation ; 23(10): 1061-1066, 2021.
Article in English | MEDLINE | ID: mdl-33501846

ABSTRACT

To assess the cadmium (Cd) phytoremediation of three native plant species from Padeang zinc (Zn) mine area (Chromolaena odorata, Impatiens patula, and Gynura pseudochina), a hydroponic experiment was performed in nutrient solutions containing various concentrations of Cd (0, 5, 10, 20, and 50 mg L-1) for 15 days. In the hydroponic experiment, C. odorata showed significantly higher total Cd content than those grown in 50 mg L-1 Cd solutions. Only C. odorata and I. patula were chosen for the pot experiment. The plants were grown in spiked Cd-contaminated soils for 90 days, with different concentrations of Cd (0, 20, 40, 60, and 80 mg kg-1). The results from the pot experiment revealed that both species accumulated more Cd in their root parts, with translocation factor values < 1. C. odorata exhibited the highest biomass production, relative growth rate, and Cd uptake or removal. The findings of the study clearly demonstrate the best uptake of C. odorata in Cd phytoremediation. Novelty statementEven though Chromolaena odorata, Impatiens patula, and Gynura pseudochina have been reported as a Cd accumulator but the assessment of these species by nutrient medium and the soil was not undertaken so far. The discovery of new Cd-accumulator plants has been hindered by the lack of efficient assessing. To assess the suitability of specific species of tropical plants that are able to uptake high amounts of Cd without risk of toxicity under conditions similar to the actual field study, is a novelty.


Subject(s)
Asteraceae , Chromolaena , Impatiens , Soil Pollutants , Biodegradation, Environmental , Cadmium , Soil
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