茭白对铬的吸收积累及其亚细胞分布  

Cr Accumulation and Sub-cellular Distribution in Zizania latifolia

作　　者：朱四喜[1] 王凤友[1] 刘文 史云勋 杨秀琴[1] 吴云杰[1] 

机构地区：[1]贵州民族大学化学与环境科学学院,贵州贵阳550025 [2]草海国家级自然保护区管理局,贵州毕节553100

出　　处：《贵州农业科学》2014年第5期52-56,共5页Guizhou Agricultural Sciences

基　　金：教育部新世纪人才支持计划项目"湿地生态学"(NCET-12-0659);贵州省优秀科技教育人才省长资金项目"西南喀斯特地区人工湿地植物形态与生理的响应机制研究"[黔省专合字(2012)71];贵阳市低碳科技计划项目"复合垂直流人工湿地处理医药工业废水的关键技术研究"[筑科合同(2012205)]

摘　　要：为茭白在水体铬污染修复的运用提供科学依据,在模拟小型湿地试验系统中,用不同浓度（0,5mg/L,10mg/L,20mg/L,40mg/L,60mg/L）的含铬（Ⅵ）废水进行污染胁迫,研究在不同Cr（Ⅵ）浓度处理下,茭白的生长状况、各器官中铬的含量与积累量及其亚细胞的分布特征。结果表明,不同铬浓度处理下,茭白各器官生物量表现为根〉叶〉茎,且在铬胁迫浓度为20mg/L时,株高、根长、生物量均较大;相同Cr浓度胁迫下,不同器官中铬含量不同,总趋势为茎〉根〉叶;茭白对铬的耐性指数与转运系数均较高,且在20mg/L时最高;茭白各器官亚细胞中铬分布总趋势为胞液〉细胞壁〉细胞器。结论：茭白对低浓度（0～20mg/L）水体铬污染具有较强的积累力、转运力和耐受力,在水体铬污染植物修复中具有一定的应用价值。Z.latifolia plants were cultivated in waste water with different Cr concentrations to study their growth status,Cr accumulation in different organs and sub-cellular distribution characteristics under different Cr stress and to provide the scientific basis for phytoremediation of;Z.latifolia in Cr pollution of water.The biomass of different organs was root leaf stem under different Cr concentrations and Z. latifolia had higher height,root length and biomass when Cr concentration was 20mg/L.The general trend of Cr content and Cr accumulation in different organs was stem root leaf and root stem leaf under the same Cr concentration.Z.latifolia had higher Cr tolerance index and transfer coefficient and the Cr tolerance index and transfer coefficient was up to the highest when Cr concentration was 20mg/L.Cr was distributed in cell wall and cytosol mainly and the general trend of Cr distribution in sub-cellular level was cytosol cell wall organelle.In conclusion,Z.latifolia with the strong accumulation ability,transfer ability and tolerance to Cr with 0-20 mg/L concentration can be applied in phytoremediation of Cr pollution water.

关 键 词：Cr(Ⅵ) 茭白 铬胁迫 植物修复 亚细胞分布 

分 类 号：S645.2[农业科学—蔬菜学]