A Bacillus and Lysinibacillus sp. bio-augmented Festuca arundinacea phytoremediation system for the rapid decontamination of chromium influenced soil

被引：19

作者：

Peng, He ^{[1
]}

Liang, Ke ^{[1
]}

Luo, Huanyan ^{[1
]}

Huang, Huayan ^{[1
]}

Luo, Shihua ^{[1
]}

Zhang, AKang ^{[1
]}

Xu, Heng ^{[1
,2
,3
]}

Xu, Fei ^{[1
,2
,3
]}

机构：

[1] Sichuan Univ, Coll Life Sci, Minist Educ, Key Lab Bioresource & Ecoenvironm, Chengdu 610065, Sichuan, Peoples R China

[2] Sichuan Univ, Key Lab Environm Protect Soil Ecol Protect & Poll, Chengdu 610065, Sichuan, Peoples R China

[3] Dept Ecol & Environm Sichuan, Chengdu 610065, Sichuan, Peoples R China

来源：

CHEMOSPHERE | 2021年 / 283卷

关键词：

Hexavalent chromium; Combination remediation; Phytoremediation; Bacteria; Festuca arundinacea; METAL-CONTAMINATED SOIL; HEXAVALENT CHROMIUM; CR(VI) REDUCTION; HEAVY-METALS; CHROMATE; REMEDIATION; RESISTANT; RESPONSES; REMOVAL; STRESS;

D O I：

10.1016/j.chemosphere.2021.131186

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Phytoremediation as an efficient and eco-friendly soil detoxification method has received widespread attention. In this study, two newly screened Chromium (Cr) reducing strains (Bacillus sp. AK-1 and Lysinibacillus sp. AK-5) were used to remediate Cr contaminated soil in conjunction with the application of hyperaccumulator tall fescue (Festuca arundinacea), thus establishing a soil Cr decontamination system. In this system, soil urease and dehydrogenase activities were increased, the malondialdehyde (MDA) contents in leaves of tall fescue were significantly decreased, while glutathione (GSH) contents increased. In terms of Cr fractions, the proportion of acetic acid extractable Cr decreased by 12.82-20.00% in treatment groups, respectively, compared with CK, while residual Cr increased by 9.41-22.37%. Moreover, biomass, root length and shoot length of tall fescue in treatment groups increased by 80.77-139.74%, 60.85-68.04%, 7.06-27.10%, respectively. In addition, the root system of tall fescue accumulated 303.887-372.167 mg kg(-1) of Cr, and the aboveground part accumulated 16.289-19.289 mg kg(-1) of Cr. Therefore, the application of strains AK-1 and AK-5 reduced the toxicity of Cr to plants and greatly increased plant accumulation potential, which indicated that AK-1 and AK-5 could improve removal efficiency of phytoremediation in Cr contaminated soil by reducing its bio-toxicity and promoting growth of tall fescue growth.

引用

页数：10