水蓼对汞积累与分布的水培实验

通过水培实验,研究不同浓度的汞(0、0.5、1、10、20和50μg·L-1)对水蓼生长的影响及水蓼的耐受性表现。结果表明:在所处理的浓度范围内,水蓼生长与生理表现未受影响。水蓼根部具有最强的汞富集能力,富集系数高达531.5%。培养液中的汞浓度与水蓼茎、叶和根中汞的富集量呈显著正相关。在同一浓度时,随着培养时间的增长,水蓼体内汞含量不断增加。水蓼茎、叶和根亚细胞中的汞分布规律表现为:细胞壁>细胞器>细胞液,细胞壁对进入植物体内的汞有很强的束缚作用,限制其进入细胞质内部。

Mercury accumulation and distribution in Polygonum hydropiper: A hydroponic experiment

A hydroponic experiment was conducted to study the growth and tolerance performance of Polygonum hydropiper exposed to different concentration mercury (0, 0.5, 1, 10, 20, and 50 μg·L-1). In all treatments, the growth and physiological performances of P. hydropiper were not affected. The root tissue of P. hydropiper had the greatest accumulation of mercury, with the enrichment coefficient being 531.5%. The mercury accumulation in P. hydropiper stem, leaf, and root was significantly positively correlated with the mercury concentration in culture solution. Under a given mercury concentration, the mercury level in P. hydropiper plants increased with culture time. The subcellular mercury concentration in the stem, leaf, and root was in the order of cytoderm > cytoplasmic organelles > cytolymph. Due to the strong mercury-binding effect of cytoderm, the mercury translocation from cytoderm to cytoplasmic organelles and cytolymph was limited.