Stem aqueous extracts of accumulator Bidens tripartita L. strongly promoted Solanum nigrum L. Cd hyperaccumulation from soil
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The effects of aqueous extracts from bio-resources on Solanum nigrum L. Cd hyperaccumulation were determined with EDTA as control.
Soil pot culture experiment and Leaching experiment were arranged and conducted.
The results showed that stem extracts of Bidens tripartita L. (BT-S) significantly increased (by 61.0%) Cd shoot concentration in S. nigrum, which was higher compared (p < 0.05) to EDTA addition (32.4%), and the plants grew well. However, S. nigrum shoot biomass significantly decreased by 23.9% (p < 0.05) in the case of EDTA addition. The extraction rate of BT-S was 56.2% in the soil leaching experiment, and the extractable Cd concentration in soil in BT-S treatment was 69.7% higher compared to control. The concentrations of soluble polysaccharides, total organic acids and reducing sugars in the BT-S treatment were much higher than for other extracts, which may partly be the reason for it strong stimulation of S. nigrum Cd hyperaccumulation from the soil.
The aqueous extracts of B. tripartita stems (BT-S) significantly increased (p < 0.05) S. nigrum hyperaccumulating Cd. This new chelator that can replace EDTA is of great significance for phytoremediation.
KeywordsBidens tripartita L. Extracts Strengthen Hyperaccumulation
This work was supported by the Special Plan in the Major Research & Development of the 13rd Five-Year Plan of China (2018YFC1800501, 2016YFD0800802), the National Natural Science Foundation of China (31870488, 41571300, 31270540, 31070455), Projects of Shaanxi Province (2019JM-413, 15JK1121, 17JS023, 2018SZS-27-07), and the project of Foreign Experts Bureau of Shaanxi province (G20190241001, GDT20186100430B).
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