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微囊藻毒素在沉水植物苦草中的积累 被引量:14

UPTAKE OF THE CYANOBACTERIAL HEPATOTOXIN MICROCYSTIN-RR BY SUBMERGENT MACROPHYTE VALLISNERIA NATANS(LOUR.)HARA.
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摘要 研究了微囊藻毒素RR在大型沉水植物苦草根、叶组织中的积累作用 ,通过ELISA方法检测发现 ,苦草可以吸收MC RR ,其吸收具有时间和剂量效应 ,根的吸收作用强于叶。第 7d叶对MC RR的吸收已经达到平衡 ,而根对MC RR的吸收在处理第 16d时还在上升。苦草根和叶对MC RR的最大吸收量分别可达到 14 83± 0 12 μg/g FW和0 32± 0 0 2 6 μg/g FW。在 0 0 0 0 1mg/L的低浓度下 ,苦草根和叶对MC RR的吸收量分别为 0 5 9± 0 0 83pg/g FW和0 2 8± 0 0 16pg/g FW ,生物浓缩系数分别为 5 85± 0 83和 2 85± 0 16。这个结果表明 ,MC Recently, heavy blooms frequently occured in Dianchi Lake and Microcystis is the main algae involved in blooms. Microcystis produces a family of related cyclic hepatopeptides(microcystins,MC). These toxins are severely hepatotoxic. Most investigations about the toxicity of the microcystins are focused on animals and terrestrial plants. To our knowledge,only a few studies have been made on the possible accumulation of microcystins on aquatic plants. This Paper evaluated the accumulation of MC-RR in Vallisneria natans,which is commonly used as food for fish or crab in some aquaculture places,using ELISA to quantify the amount of the heptotoxin accumulated. The results indicated that the roots and leaves of V. natans seedlings can absorb MC-RR. the amount of toxin accumulated in the roots and leaves of the seedlings is time and dose dependent, and the roots absorbed more toxins than leaves given the same condition. The absorption peaked after 7d's exposure to the toxin and maintained this value in leaves, while the toxin in roots still accumulating after 16d's exposure. The maximum amount of toxin accumulated in the roots and leaves is 14.83±0.12μg/g. FW and 0.32±0.026μg/g. FW respectively when exposed to the 10mg/L toxin solutions,and the numbers reduced to 0.59±0.083pg/g. FW and 0.28±0.016pg/g. FW when the toxin is at the concentration of 0.0001 mg/L. In contrast,the BCF value of the root and shoot increased from 0.13±0.013 and 0.035±0.0048 to 5.85±0.83 and 2.85±0.16 respectively. The results indicate that Microcystin-RR can accumulate in Vallisneria natans plant and raise the possibility that Microcystins could be thereby transferred into aquatic food web.
出处 《水生生物学报》 CAS CSCD 北大核心 2004年第2期151-154,共4页 Acta Hydrobiologica Sinica
基金 中国科学院知识创新工程重大项目 (KZCX1 SW 12 ) 国家重大环境课题"滇池蓝藻水华污染控制技术研究"(K99 0 5 3 5 0 1) 973项目 (2 0 0 2CB412 3 0 0 ) 中国科学院方向性创新课题 (2 2 0 3 16)资助
关键词 苦草 微囊藻毒素 积累 富营养化 蓝藻水华 Vallisneria natans(Lour.)Hara MC-RR uptake
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