大米草对有机汞的耐性、吸收及转化  

Organic Mercury Tolerance, Absorption and Transformation in Spartina Plants

作　　者：田吉林[1] 诸海焘[2] 杨玉爱[1] 何玉科[3] 

机构地区：[1]浙江大学环境与资源学院,杭州310029 [2]上海市农业科学院环境科学研究所 [3]中国科学院上海生命科学研究院植物生理生态研究所

出　　处：《植物生理与分子生物学学报》2004年第5期577-582,共6页Journal Of Plant Physiology and Molecular Biology

基　　金：国家自然科学基金(No.20277031)~~

摘　　要：大米草对营养液中氯化甲基汞(McHgCl)毒性的临界浓度为15 μmol/L,是烟草的3倍。氯化甲基汞处理后,植株体内有机汞总量在增加,而营养液中有机汞总量在减少,无机汞总量则明显增加。这些结果表明,大米草可以吸收有机汞,将有机汞部分地转化为无机汞,并且无机汞较多地积累在植株的地下部,同时有一部分通过扩散或分泌进入营养液中。大米草对汞的积累作用和把有机汞转化为无机汞的转化作用在环境污染的植物修复方面有重要的利用价值。Critical concentration of methylmercuric chloride (MeHgCl) in the nutrient solution to which Spartina plants are tolerant is 15 μmol/L, three times higher than that of tobacco plants. After being treated with methylmercuric chloride, total quantity of organic mercury within plants increased and that of nutrient solution decreased greatly so that total quantity of inorganic mercury rose (Table 1). It is inferred that Spartina plants absorb organic mercury and partially transform organic into inorganic mercury, and then more inorganic mercury is accumulated in underground parts of plants (Table 2). In addition, inorganic mercury derived from organic mercury moved to solution by diffusion and permeation. In this way,the features Spartina plants exhibit in mercury accumulation and transformation from organic to inorganic mercury are valuable for phytoremediation of environment pollution.

关 键 词：大米草 有机汞 形态转化 植物修复 

分 类 号：X173[环境科学与工程—环境科学]