Effects of nano-silicon and common silicon on lead uptake and translocation in two rice cultivars

doi:10.1007/s11783-015-0786-x

Front. Environ. Sci. Eng.

2015, Vol. 9

Issue (5) : 905-911 https://doi.org/10.1007/s11783-015-0786-x

RESEARCH ARTICLE

Effects of nano-silicon and common silicon on lead uptake and translocation in two rice cultivars

Jianguo LIU(

),Hui CAI,Congcong MEI,Mingxin WANG

School of Environmental and Safety Engineering, Changzhou University, Changzhou 213164, China

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Abstract

The current study investigated the effects of nano-silicon (Si) and common Si on lead (Pb) toxicity, uptake, translocation, and accumulation in the rice cultivars Yangdao 6 and Yu 44 grown in soil containing two different Pb levels (500 mg·kg⁻¹ and 1000 mg·kg⁻¹). The results showed that Si application alleviated the toxic effects of Pb on rice growth. Under soil Pb treatments of 500 and 1000 mg·kg⁻¹, the biomasses of plants supplied with common Si and nano-Si were 1.8%–5.2% and 3.3%–11.8% higher, respectively, than those of plants with no Si supply (control). Compared to the control, Pb concentrations in rice shoots supplied with common Si and nano-Si were reduced by 14.3%–31.4% and 27.6%–54.0%, respectively. Pb concentrations in rice grains treated with common Si and nano-Si decreased by 21.3%–40.9% and 38.6%–64.8%, respectively. Pb translocation factors (TFs) from roots to shoots decreased by 15.0%–29.3% and 25.6%–50.8%, respectively. The TFs from shoots to grains reduced by 8.3%–13.7% and 15.3%–21.1%, respectively, after Si application. The magnitudes of the effects observed on plants decreased in the following order: nano-Si treatment>common Si treatment and high-grain-Pb-accumulating cultivar (Yangdao 6)>low-grain-Pb-accumulating cultivar (Yu 44) and heavy Pb stress (1000 mg·kg⁻¹)>moderate Pb stress (500 mg·kg⁻¹)>no Pb treatment. The results of the study indicate that nano-Si is more efficient than common Si in ameliorating the toxic effects of Pb on rice growth, preventing Pb transfer from rice roots to aboveground parts, and blocking Pb accumulation in rice grains, especially in high-Pb-accumulating rice cultivars and in heavily Pb-polluted soils.

Keywords silicon (Si) lead (Pb) rice (Oryza sativa L.) toxicity accumulation

Corresponding Author(s): Jianguo LIU

Just Accepted Date: 08 April 2015 Online First Date: 24 April 2015 Issue Date: 08 October 2015

Cite this article:

Hui CAI,Congcong MEI,Mingxin WANG, et al. Effects of nano-silicon and common silicon on lead uptake and translocation in two rice cultivars[J]. Front. Environ. Sci. Eng., 2015, 9(5): 905-911.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-015-0786-x
https://academic.hep.com.cn/fese/EN/Y2015/V9/I5/905

Tab.1 Selected properties of the soil used in this experiment

Fig.1 Effects of silicon on biomasses of rice plants. (a) The rice cultivar Yangdao 6, (b) the rice cultivar Yu 44. NPbT: no Pb treatment, the soil Pb concentration is 32.7 mg·kg⁻¹. Different letters above the columns of a Pb treatment indicate significant difference between Si treatments at P<0.05 within the Pb treatment

Fig.2 Effects of silicon on Pb concentrations in rice roots. (a) Yangdao 6, (b) Yu 44. Different letters above the columns of a Pb treatment indicate significant difference between Si treatments at P<0.05 within the Pb treatment

Fig.3 Effects of silicon on Pb concentrations in rice shoots. (a) Yangdao 6, (b) Yu 44. Different letters above the columns of a Pb treatment indicate significant difference between Si treatments at P<0.05 within the Pb treatment

Fig.4 Effects of silicon on Pb concentrations in rice grains. (a) Yangdao 6, (b) Yu 44. Different letters above the columns of a Pb treatment indicate significant difference between Si treatments at P<0.05 within the Pb treatment

Fig.5 Effects of silicon on translocation factors (TFs) of Pb from roots to shoots (Pb concentration ratio of shoot to root). (a) Yangdao 6, (b) Yu 44. Different letters above the columns of a Pb treatment indicate significant difference between Si treatments at P<0.05 within the Pb treatment

Fig.6 Effects of silicon on translocation factors (TFs) of Pb from shoots to grains (Pb concentration ratio of grain to shoot). (a) Yangdao 6, (b) Yu 44. Different letters above the columns of a Pb treatment indicate significant difference between Si treatments at P<0.05 within the Pb treatment

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