Bacillus sp.Z2对稀土钇的固定及阻控水稻吸收效应  

Bacillus sp.Z2 immobilized rare earth yttrium and reduced the absorption of Y in rice.

作　　者：王伟英 徐成龙 陈盈盈 朱笃[1,2] WANG Wei-ying;XU Cheng-long;CHEN Ying-ying;ZHU Du(Key Laboratory of Protection and Utilization of Subtropical Plant Resources of Jiangxi Province,College of Life Sciences,Jiangxi Normal University,Nanchang 330022,China;Key Laboratory of Bioprocess Engineering of Jiangxi Province,College of Life Science and Technology Normal University,Nanchang 330013,China)

机构地区：[1]江西师范大学生命科学学院,江西省亚热带植物资源保护与利用重点实验室,江西南昌330022 [2]江西科技师范大学生命科学学院,江西南昌330013

出　　处：《中国环境科学》2023年第2期927-934,共8页China Environmental Science

基　　金：江西省自然科学基金资助项目(20192BAB214002);江西省亚热带植物资源保护与利用重点实验室开放基金项目(YRD201907)。

摘　　要：本文从赣南稀土矿区分离获得一株耐钇(Y)的根际植物促生细菌Z2,初步鉴定为芽孢杆菌属细菌,摇瓶发酵条件下能够有效减少Y3+生物有效性,其作用机理可能是菌体吸附、pH值升高以及活性代谢产物与Y3+结合的共同作用.水稻砂培过程中添加Z2菌能够显著减少水稻根部Y的积累:0.08mmol/L处理条件下减少49%(P<0.05),0.35mmol/L处理条件下减少43%(P<0.01).植物螯合肽响应水稻根部积累的稀土钇,金属硫蛋白和谷胱甘肽转硫酶无明显变化.研究结果表明Z2菌可作为潜在的菌种资源,在细菌修复稀土污染农田和保障水稻安全生产中应用.A rhizosphere growth-promoting bacterium Z2 resistant to yttrium(Y)was isolated from the rare earth mining area in southern Jiangxi Province.It was identified as Bacillus sp.,which could effectively reduce the bioavailability of Y3+under shake-flask fermentation.The mechanism may be the combined effect of bacterial adsorption,pH increasing and active metabolite which can bind with Y3+.In pot experiment,Z2 could significantly reduce the accumulation of Y in rice root by 49%(P<0.05)and 43%(P<0.01)under 0.08 and 0.35mmol/L Y3+treatment conditions,respectively.Phytochelatin was responsive to the increase of yttrium content in rice roots,metallothionein and glutathione s-transferase did not change significantly.The results indicated that Z2 could be used as a potential strain resource in the remediation of rare-earth contaminated farmland and in the safe production of rice.

关 键 词：稀土钇 根际植物促生菌 钝化修复 水稻 

分 类 号：X171[环境科学与工程—环境科学] X172