摘要
[Objective] The Cu-tolerance and Cu enrichment capacity of TLSB2-K were investigated. [Method] The previously isolated TLSB2-K strain was identified though morphological observation, gram staining and 16S rDNA sequence alignment. In ad- dition, the effects of temperature, pH and osmotic pressure on the growth of strain were also investigated by using shaking culture. The Cu-tolerance and Cu enrich- ment capacity of TLSB2-K strain under Cu stress were also studied. [Result] The results showed TLSB2-K belongs to Bacillus spp., and its optimum growth conditions were as follows: temperature, 27 ~C; pH, 7.0; osmotic pressure, 1.1% NaCI. When the Cu concentration ranged from 100 mg/L to 500 mg/L, the strain grew well; when the Cu concentration ranged from 100 mg/L to 400 mg/L, the Cu content in bacteria was increased with the increase of Cu concentration; when the Cu con- centration was 400 mg/L and the incubation time was 30 h, the Cu content in bac- teria reached the peak (2 250 mg/kg); the highest tolerant concentration was 700 mg/L. [Conclusion] TLSB2-K strain had relatively high Cu tolerance and Cu enrich- ment capacity. They had important theoretical research and engineering application values.
[目的]研究菌株TLSB2-K的铜耐性以及其铜富集能力的特性。[方法]通过形态观察、革兰氏染色和16S r DNA序列比对,对前期分离的菌株TLSB2-K进行了鉴定,并采用振荡培养法,探讨了温度、p H值和渗透压对菌株生长的影响,以及铜胁迫下菌株对铜的耐性及富集能力。[结果]TLSB2-K属于蜡样芽孢杆菌(Bacillus cereus),最适生长条件为:温度为27℃、p H值为7、渗透压为1.1%Na Cl。铜浓度100~500 mg/L范围内,菌体生长良好,铜浓度在100~400 mg/L范围内,菌体铜含量随着铜浓度的升高而增加,当铜浓度400 mg/L胁迫培养30 h,菌体铜含量达到最大值2 250mg/kg;菌株的最高铜耐受浓度为700 mg/L。[结论]菌株TLSB2-K具有较强的铜耐性和较高的铜富集能力,具有重要的理论研究和工程应用价值。
基金
Supported by Hubei Provincial Department of Education Youth Found(Q2014402)
Key Project of Natural Science Foundation of Hubei Province(2011CDA037)
Special Fund for Agro-scientific Research in the Public Interest of Hubei Province(2012DCA23)
Hubei Provincial Key Laboratory of Mining Environmental Pollution Control and Remediation Open Foundation(2012106)
Project of Outstanding Yong and Middleaged Scientific and Technological Innovation Team of Colleges and Universities in Hubei Province(T201223)~~