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.
出处
《植物生理与分子生物学学报》
CAS
CSCD
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)~~
关键词
大米草
有机汞
形态转化
植物修复
Spartina
organic mercury
transformation
phytoremediation
