Speciation and accumulation pattern of heavy metals from soil to rice at different growth stages in farmland of southwestern China

Spring wheat var. Vánek was cultivated in pots in a soil naturally contaminated with heavy metals. Experimental plants were treated with three different types of brassinosteroids (BRs; 24-epibrassinolide, 24-epicastasterone and 4154) during two different growth stages 29–31 DC (off shooting) and 59–60 DC (beginning of anthesis). Content of heavy metals (Cu, Cd, Pb and Zn) was determined using AAS method in the plant growth stages 47–49 DC (visible awns), 73–75 DC (30–50% of final grain size) and 90–92 DC (full ripeness). At the stages 47–49 DC and 73–75 DC, the content of the heavy metals was determined in the biomass of whole plants, while at the stage 90–92 DC it was determined separately in straw and grains. After the treatment of plants with BRs a decrease in heavy metals content was observed in the growth stage 73–75 DC (i.e. during the period when the plants are harvested for ensilage purposes. Likewise, a decrease of lead content in the grains by 70–74% in the plants treated at both stages 29–31 DC and 59–60 DC and by 48–70% in the plants of the third group (plants treated at stage 59–60 DC) was determined as compared with the untreated plants.

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Study on the Accumulation of Heavy Metals in Alpinia Oxyphylla Miq. at Different Growth Stages

Proceedings of the 2015 International Symposium on Energy Science and Chemical Engineering ◽

10.2991/isesce-15.2015.16 ◽

2015 ◽

Author(s):

Dan Zhou ◽

Yurong Fu ◽

Weiyong Lai ◽

Junqing Zhang

Keyword(s):

Heavy Metals ◽

Growth Stages ◽

Alpinia Oxyphylla ◽

Different Growth Stages

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Rumex acetosa L. Application on the Bioremediation of Soil Polluted by Combined Heavy Metals of Cd, Cu and Pb

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.518-523.3069 ◽

2012 ◽

Vol 518-523 ◽

pp. 3069-3073

Author(s):

Yi Yang Zhao ◽

Jia Li Shen Tu ◽

Kun Bai Chen

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Metal Pollution ◽

Test Area ◽

Growth Stages ◽

Rumex Acetosa ◽

Transfer Capability ◽

Different Growth Stages ◽

Combined Heavy Metals

Enrichment capacity and transfer capability of R. acetosa were studied in situ at the different growth stages, and the soil was polluted by the two levels (T1: Cd 0.70 mg/kg+Cu 114.37 mg/kg+Pb 138.94 mg/kg; T2: Cd 1.34 mg/kg+Cu 164.90 mg/kg+Pb 176.19 mg/kg) of combined heavy metals. The results showed that the content of Cd, Cu and Pb in roots increased first, then decreased and increased again as R. acetosa growing in each test area. And the content of Cd, Cu and Pb in shoots showed the same trend as roots. The enrichment capacity of R. acetosa to Cu and Pb was improved as the level of heavy metal pollution increased at the different growth stages, while the Cd was in inverse proportion to the concentration. But its enrichment capacity and transfer capability of Cd to be significantly higher than Cu and Pb. R. acetosa application on the bioremediation of soil polluted by combined heavy metals of Cd, Cu and Pb showed great potential.

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Enrichment Characteristics of Cadmium and Lead in Wheat at Different Growth Stages

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.664.55 ◽

2013 ◽

Vol 664 ◽

pp. 55-58

Author(s):

Su Chen ◽

Lei Chao ◽

Li Na Sun ◽

Tie Heng Sun

Keyword(s):

Heavy Metals ◽

Growth Period ◽

Wheat Plant ◽

Mature Stage ◽

Test Plant ◽

Growth Stages ◽

Rice Husks ◽

Wheat Roots ◽

Different Growth Stages ◽

Enrichment Characteristics

In this paper, the soil simulation pot experiment was carried out. The self-made cadmium (Cd) and lead (Pb) compound contaminated soil was taken as the test soil, and wheat was taken as the test plant. The Cd and Pb concentrations in different parts of wheat under jointing stage, booting stage, flowering stage, and mature period were measured, and enrichment characteristics of wheat to Cd and Pb under different growth stages were analyzed. The results showed that Cd and Pb contents in wheat roots were the greatest, while the contents in nutritive organ seeds were the least. Sequence of Cd and Pb contents in various parts of wheat was: roots> stems & leaves> rice husks> seeds. Cd and Pb contents in various parts of wheat plant gradually grew in the entire growth period, which reached the maximum at mature stage. According to the transfer coefficient and enrichment factor analysis, ability of wheat roots to enrich heavy metals Cd and Pb was stronger than that of stems & leaves, rice husks and seeds. In the transfer process of heavy metals Cd and Pb from soil to root, the transfer ability sequence was Cd > Pb.

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