蜡状芽孢杆菌与李氏禾协同净化水体Cr(VI)的机制研究

Cr(VI) contamination in water is not an urgent environmental problem but also an eco-security problem which relate to public health. The Leersia hexandra Swartz-microorganism combined remediation technique was considered to be a cheap and effective technology for Cr(VI) removal from water. Our research shows that Bacillus cereus could promote the efficiency of Leersia hexandra Swartz in purifying Cr(VI)-polluted water, but we lack knowledge and research about the synergistic mechanism on combination of Bacillus cereus with Leersia hexandra Swartz for Cr(VI)-polluted water purification.It is critical for the combined system to their own full potential abilities for the Cr(VI)-polluted water purification. This research aims to examine the interactions among Bacillus cereus, Leersia hexandra Swartz and rhizosphere under Cr(VI); improve the system’s ability for Cr(VI) reduction based on the regulation of critical physiological and ecological factors; illuminate the synergy of Bacillus cereus and purification of Cr(Ⅵ)-polluted water by Leersia hexandra Swartz; ascertain the relationship between Bacillus cereus and the growth of Leersia hexandra Swartz; explore the effects of Bacillus cereus on the Cr endurance and the detoxification effect of Leersia hexandra Swartz. This research will provide scientific evidence for improving the efficiency of Leersia hexandra Swartz in purifying Cr(Ⅵ)-polluted water, which is of great significance academically as well as practically.

水体Cr(Ⅵ)污染是亟待解决的环境问题，也是关系到公众健康的社会安全问题。利用李氏禾与微生物联合修复技术有望成为解决水体Cr(Ⅵ)污染廉价有效的方法和手段。课题组前期研究表明，蜡状芽孢杆菌对李氏禾净化水体Cr(Ⅵ)具有促进作用，但蜡状芽孢杆菌与李氏禾净化水体Cr(Ⅵ)的协同作用机制缺乏相关研究和认知，其是充分发挥植物-微生物联合体系对Cr(Ⅵ)修复潜力的关键。本项目拟在前期研究的基础上深入研究Cr(Ⅵ)胁迫下蜡状芽孢杆菌与李氏禾以及根际环境之间的交互作用机制，分析基于关键生理和生态因子的调控作用提高体系还原Cr(Ⅵ)的能力；阐明蜡状芽孢杆菌与李氏禾净化Cr(Ⅵ)的协同效应；明确蜡状芽孢杆菌与李氏禾生长的关系；探讨蜡状芽孢杆菌对李氏禾Cr耐受能力和解毒作用的影响。研究结果将为提高李氏禾修复Cr(Ⅵ)污染水体的效率提供科学依据，既具有重要的学术意义，又具有极大的实际应用价值。

水体Cr(Ⅵ)污染是亟待解决的环境问题，也是关系到公众健康的社会安全问题。利用李氏禾与微生物联合修复技术是解决水体Cr(Ⅵ)污染廉价有效的方法和手段。本项目在前期研究的基础上深入研究Cr(Ⅵ)胁迫下蜡状芽孢杆菌与李氏禾以及根际环境之间的交互作用机制，分析了基于关键生理生态因子提高体系还原Cr(Ⅵ)的能力的作用机理；阐明了蜡状芽孢杆菌与李氏禾净化Cr(Ⅵ)的协同效应；明确蜡状芽孢杆菌具有促进李氏禾生长的作用，同时明确了蜡状芽孢杆菌有效提升了李氏禾Cr耐受能力和解毒作用。研究结果为提高李氏禾修复Cr(Ⅵ)污染水体的效率提供科学依据，既具有重要的学术意义，又具有极大的实际应用价值。