耐镉浮萍筛选、鉴定及其对镉的富集效果
Screening, identification and enrichment effects of cadmium-tolerant duckweeds
查看参考文献46篇
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文摘
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近年来,水体镉污染日益严峻,筛选超富集植物用于其治理具有重要意义。本研究以90个浮萍株系为实验材料,采用30 mg·L~(–1)的镉处理7 d,获得7个镉耐受优势株系。通过Blast比对和构建系统发育树鉴定该7个浮萍株系的种属,确定为Spirodela polyrhiza、Lemna japonica、Lemna minor和Landoltia punctata。通过低质量浓度(0.5 mg·L~(–1))和高质量浓度(10 mg·L~(–1))镉处理7 d,进一步比较和研究了7个优势株系对镉的富集效果。结果表明,低浓度镉处理后,5个株系的镉富集量超过100 mg·kg~(–1);高浓度镉处理后,7个浮萍株系的镉富集量超过1 200 mg·kg~(–1),生物富集系数大于120,对水体中镉的去除率高于70%。其中,4号株系(L. japonica)为本次筛选出的最佳株系,其镉富集量、生物富集系数和对水体中镉的去除率分别达到2 834.30 mg·kg~(–1)、283.43和82.50%。 |
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其他语种文摘
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In recent years, the cadmium pollution in water has become severe, and it is of great significance to screen hyperaccumulators for its treatment. In this study, 90 duckweed strains were taken as experimental materials and treated with 30 mg·L~(–1) cadmium for 7 days, then 7 cadmium-tolerant dominant strains were obtained. Through Blast comparison and construction of phylogenetic trees, the species of these 7 duckweed strains were identified as Spirodela polyrhiza, Lemna japonica, Lemna minor and Landoltia punctata. After treatment with low concentration (0.5 mg·L~(–1)) and high concentration (10 mg·L~(–1)) cadmium for 7 days, the enrichment effects of 7 dominant strains were further studied and compared. Under low concentration cadmium treatment, the cadmium concentration of 5 duckweed strains exceeded 100 mg·kg~(–1). Under high concentration cadmium treatment, the cadmium concentration of 7 duckweed strains exceeded 1 200 mg·kg~(–1). The bioconcentration factors were higher than 120, and the water cadmium removal rates were higher than 70%. Among them, 4 duckweed strain (L. japonica) was the best strain selected in this study, and its cadmium concentration, bioconcentration factor and water cadmium removal rate reached 2 834.30 mg·kg~(–1), 283.43 and 82.50, respectively. |
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来源
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环境工程学报
,2022,16(2):471-480 【核心库】
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DOI
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10.12030/j.cjee.202110072
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关键词
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浮萍
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重金属镉
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品种鉴定
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超富集植物
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水体污染
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地址
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贵州大学生命科学学院/农业生物工程研究院, 山地植物资源保护与种质创新教育部重点实验室;;贵州省农业生物工程重点实验室, 贵阳, 550025
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贵州大学动物科学学院, 贵阳, 550025
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中国科学院地球化学研究所, 环境地球化学国家重点实验室, 贵阳, 550025
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1673-9108 |
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学科
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行业污染、废物处理与综合利用 |
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基金
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国家自然科学基金青年项目
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国家自然科学基金
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贵州省科技支撑计划项目
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贵州大学人才引进项目
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文献收藏号
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CSCD:7173367
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