文章摘要
刘玉玲,铁柏清,李园星露,魏祥东,彭鸥,叶长城,刘孝利,孙健.耐镉细菌的分离及其对土壤中镉的形态影响[J].农业环境科学学报,2018,37(2):250-258.
耐镉细菌的分离及其对土壤中镉的形态影响
Isolation of a Cd-resistant bacterium and its effect on the speciation of Cd in soil
投稿时间:2017-07-10  修订日期:2017-11-06
DOI:10.11654/jaes.2017-0966
中文关键词: 食酸戴尔福特菌    吸附率  形态
英文关键词: Delftia acidovorans  Cd  adsorption rate  speciation
基金项目:国家科技支撑计划课题(2015BAD05B02-07);国家自然科学基金项目(41201511)
作者单位E-mail
刘玉玲 湖南农业大学资源环境学院, 长沙 410128
湖南省重金属污染耕地安全高效利用工程研究中心, 长沙 410013 
 
铁柏清 湖南农业大学资源环境学院, 长沙 410128
湖南省重金属污染耕地安全高效利用工程研究中心, 长沙 410013 
tiebq@qq.com 
李园星露 湖南农业大学资源环境学院, 长沙 410128
湖南省重金属污染耕地安全高效利用工程研究中心, 长沙 410013 
 
魏祥东 湖南农业大学资源环境学院, 长沙 410128
湖南省重金属污染耕地安全高效利用工程研究中心, 长沙 410013 
 
彭鸥 湖南农业大学资源环境学院, 长沙 410128
湖南省重金属污染耕地安全高效利用工程研究中心, 长沙 410013 
 
叶长城 湖南农业大学资源环境学院, 长沙 410128
湖南省重金属污染耕地安全高效利用工程研究中心, 长沙 410013 
 
刘孝利 湖南农业大学资源环境学院, 长沙 410128
湖南省重金属污染耕地安全高效利用工程研究中心, 长沙 410013 
 
孙健 广东工业大学环境科学与工程学院, 广州 510006  
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中文摘要:
      通过传统的分离方法和室内培养实验,从Cd污染土壤中筛选和分离出一株对Cd2+吸附率高的菌株B9,并分析B9对土壤Cd形态的影响,探究其在Cd污染土壤修复中应用的可行性。16S rRNA序列分析结果表明,B9与食酸代尔福特菌(Delftia acidovorans,登录号NC010002)的16S rRNA序列具有99%的同源性,结合形态和生理生化指标,将其鉴定为代尔福特菌。研究结果表明,B9在pH=8、温度为35℃、培养时间为48 h时,对Cd2+的吸附效果最好,且Cd2+浓度低于10 mg·L-1时,吸附率均在60%以上。接种B9可促进污染土壤中的Cd从弱酸可溶态向可还原态和残渣态转化。添加3 mL(接种量为1.44×1011 cfus)和10 mL(接种量为4.8×1011 cfus)B9菌悬液处理能使弱酸可溶态Cd含量分别减少22.17%和25.06%,可还原态Cd含量分别增加9.66%和12.17%,对可氧化态Cd含量无明显影响,残渣态Cd2+含量分别增加13.55%和13.61%。研究结果可为Cd污染土壤微生物修复方法及菌株B9的实际应用提供数据参考与理论支持。
英文摘要:
      Contamination of heavy metals has been increasing in recent years due to industrial activity. Consequently, microbial remediation of heavy metal-polluted soils has received increasing interest. A bacterial strain, B9, with high cadmium adsorption capacity was isolated from cadmium-polluted soils through a conventional method of bacterial isolation and cultivation, and the effects of the strain on soil Cd speciation were investigated by a pot experiment to evaluate the feasibility of using B9 in Cd bioremediation. The results of 16S rRNA gene sequence analysis showed that B9 was 99% homologous to Delftia acidovorans, and was identified as Delftia sp. by morphological and biochemical analysis. It was found that the highest adsorption efficiency for Cd2+ was achieved at pH 8, 35℃, and 48 h of incubation time. In these conditions, more than 60% of the Cd2+ could be adsorbed from a concentration below 10 mg·L-1. B9 could facilitate Cd transformation from weak acid-soluble to reducible and residual phases in soil. The addition of 3 mL and 10 mL bacterial suspensions into the soil resulted in 22.17% and 25.06% decreases in the content of weak acid-soluble Cd, 9.66% and 12.17% increases in the content of reduced Cd, and 13.55% and 13.61% increases in the content of residual Cd, respectively, whereas the content of oxidized Cd did not significantly change. The results provide convincing evidence for the potential application of the B9 strain for bioremediation of Cd-contaminated soil.
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