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Inoculation of soil with cadmium-resistant bacterium Delftia sp. B9 reduces cadmium accumulation in rice (Oryza sativa L.) grains.
Ecotoxicol Environ Saf. 2018 Nov 15; 163:223-229.EE

Abstract

Bioremediation of heavy metal polluted soil using metal-resistant bacteria has received increasing attentions. In the present study, we isolated a heavy metal-resistant bacterial strain from a Cd-contaminated soil, and conducted pot experiments to evaluate the effect of bacterial inoculation in soil on soil Cd speciation, rice grain biomass and Cd accumulation. We find that the isolated bacterial strain is a Gram-negative bacterium, and named as Delftia sp. B9 based on the 16S rDNA gene sequence analysis. TEM-EDS manifests that Cd can be bioaccumulated inside cell, resulting in intracellular dissolution. The Cd contents of rice grain in the two rice cultivars (early and late rice) are all below the standard limit for Food Safety of People's Republic of China (0.2 mg/kg) after the treatment of both living and non-living cells. Non-living cells are more applicable than the use of living cells for the short time bioremediation. The average content of soil exchangeable fraction of Cd decreases whereas the residual fraction increases with bacterial inoculation. All our results suggest Delftia sp. B9 is able to the stabilization of Cd in soil and reduce Cd accumulation in rice grain, therefore, this strain is potentially suitable for the bioremediation of Cd-contaminated paddy soils.

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Authors+Show Affiliations

Liu Y
College of Resources and Environment, Hunan Agricultural University, Changsha 410128, People's Republic of China; Hunan Engineering & Technology Research Center for Irrigation Water Purification, Changsha 410128, People's Republic of China; Hunan Engineering Research Center for Safe and High-Efficient Utilization of Heavy Metal Pollution Farmland, Changsha 410128, People's Republic of China.
Tie B
College of Resources and Environment, Hunan Agricultural University, Changsha 410128, People's Republic of China; Hunan Engineering & Technology Research Center for Irrigation Water Purification, Changsha 410128, People's Republic of China; Hunan Engineering Research Center for Safe and High-Efficient Utilization of Heavy Metal Pollution Farmland, Changsha 410128, People's Republic of China. Electronic address: tiebq@qq.com.
Li Y
College of Resources and Environment, Hunan Agricultural University, Changsha 410128, People's Republic of China; Hunan Engineering & Technology Research Center for Irrigation Water Purification, Changsha 410128, People's Republic of China; Hunan Engineering Research Center for Safe and High-Efficient Utilization of Heavy Metal Pollution Farmland, Changsha 410128, People's Republic of China.
Lei M
College of Resources and Environment, Hunan Agricultural University, Changsha 410128, People's Republic of China; Hunan Engineering & Technology Research Center for Irrigation Water Purification, Changsha 410128, People's Republic of China; Hunan Engineering Research Center for Safe and High-Efficient Utilization of Heavy Metal Pollution Farmland, Changsha 410128, People's Republic of China.
Wei X
College of Resources and Environment, Hunan Agricultural University, Changsha 410128, People's Republic of China; Hunan Engineering & Technology Research Center for Irrigation Water Purification, Changsha 410128, People's Republic of China; Hunan Engineering Research Center for Safe and High-Efficient Utilization of Heavy Metal Pollution Farmland, Changsha 410128, People's Republic of China.
Liu X
College of Resources and Environment, Hunan Agricultural University, Changsha 410128, People's Republic of China; Hunan Engineering & Technology Research Center for Irrigation Water Purification, Changsha 410128, People's Republic of China; Hunan Engineering Research Center for Safe and High-Efficient Utilization of Heavy Metal Pollution Farmland, Changsha 410128, People's Republic of China.
Du H
College of Resources and Environment, Hunan Agricultural University, Changsha 410128, People's Republic of China; Hunan Engineering & Technology Research Center for Irrigation Water Purification, Changsha 410128, People's Republic of China; Hunan Engineering Research Center for Safe and High-Efficient Utilization of Heavy Metal Pollution Farmland, Changsha 410128, People's Republic of China. Electronic address: duhuihui@hunau.edu.cn.

MeSH

Biodegradation, EnvironmentalBiomassCadmiumChinaDelftiaEdible GrainMetals, HeavyOryzaSoilSoil Pollutants

Pub Type(s)

Journal Article

Language

eng

PubMed ID

30055387

Citation

Liu, Yuling, et al. "Inoculation of Soil With Cadmium-resistant Bacterium Delftia Sp. B9 Reduces Cadmium Accumulation in Rice (Oryza Sativa L.) Grains." Ecotoxicology and Environmental Safety, vol. 163, 2018, pp. 223-229.
Liu Y, Tie B, Li Y, et al. Inoculation of soil with cadmium-resistant bacterium Delftia sp. B9 reduces cadmium accumulation in rice (Oryza sativa L.) grains. Ecotoxicol Environ Saf. 2018;163:223-229.
Liu, Y., Tie, B., Li, Y., Lei, M., Wei, X., Liu, X., & Du, H. (2018). Inoculation of soil with cadmium-resistant bacterium Delftia sp. B9 reduces cadmium accumulation in rice (Oryza sativa L.) grains. Ecotoxicology and Environmental Safety, 163, 223-229. https://doi.org/10.1016/j.ecoenv.2018.07.081
Liu Y, et al. Inoculation of Soil With Cadmium-resistant Bacterium Delftia Sp. B9 Reduces Cadmium Accumulation in Rice (Oryza Sativa L.) Grains. Ecotoxicol Environ Saf. 2018 Nov 15;163:223-229. PubMed PMID: 30055387.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Inoculation of soil with cadmium-resistant bacterium Delftia sp. B9 reduces cadmium accumulation in rice (Oryza sativa L.) grains. AU - Liu,Yuling, AU - Tie,Boqing, AU - Li,Yuanxinglu, AU - Lei,Ming, AU - Wei,Xiangdong, AU - Liu,Xiaoli, AU - Du,Huihui, Y1 - 2018/07/25/ PY - 2018/05/29/received PY - 2018/07/18/revised PY - 2018/07/20/accepted PY - 2018/7/29/pubmed PY - 2018/10/26/medline PY - 2018/7/29/entrez KW - Bioremediation KW - Cadmium KW - Delftia sp. KW - Paddy soil KW - Resistant bacteria SP - 223 EP - 229 JF - Ecotoxicology and environmental safety JO - Ecotoxicol Environ Saf VL - 163 N2 - Bioremediation of heavy metal polluted soil using metal-resistant bacteria has received increasing attentions. In the present study, we isolated a heavy metal-resistant bacterial strain from a Cd-contaminated soil, and conducted pot experiments to evaluate the effect of bacterial inoculation in soil on soil Cd speciation, rice grain biomass and Cd accumulation. We find that the isolated bacterial strain is a Gram-negative bacterium, and named as Delftia sp. B9 based on the 16S rDNA gene sequence analysis. TEM-EDS manifests that Cd can be bioaccumulated inside cell, resulting in intracellular dissolution. The Cd contents of rice grain in the two rice cultivars (early and late rice) are all below the standard limit for Food Safety of People's Republic of China (0.2 mg/kg) after the treatment of both living and non-living cells. Non-living cells are more applicable than the use of living cells for the short time bioremediation. The average content of soil exchangeable fraction of Cd decreases whereas the residual fraction increases with bacterial inoculation. All our results suggest Delftia sp. B9 is able to the stabilization of Cd in soil and reduce Cd accumulation in rice grain, therefore, this strain is potentially suitable for the bioremediation of Cd-contaminated paddy soils. SN - 1090-2414 UR - https://www.unboundmedicine.com/medline/citation/30055387/Inoculation_of_soil_with_cadmium_resistant_bacterium_Delftia_sp__B9_reduces_cadmium_accumulation_in_rice__Oryza_sativa_L___grains_ DB - PRIME DP - Unbound Medicine ER -