Sequestration and Distribution Characteristics of Cd(II) by Microcystis aeruginosa and Its Role in Colony Formation.
Sequestration and Distribution Characteristics of Cd(II) by Microcystis aeruginosa and Its Role in Colony Formation.
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铜绿微囊藻对 Cd(II) 的封存和分布特征及其在菌落形成中的作用。
DOI：
10.1155/2016/9837598
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发表时间：
2016
影响因子：
--
通讯作者：
Liu Q
中科院分区：
文献类型：
--
作者：
Bi X;Yan R;Li F;Dai W;Jiao K;Zhou Q;Liu Q
为了研究铜绿微囊藻对Cd(II)的截留和分布特征及其在微囊藻集落形成中的作用，将铜绿微囊藻暴露于6种不同浓度的Cd(II)中10d。Cd(II)暴露对铜绿假单胞菌的生长有刺激作用。低浓度Cd(II)显著诱导微囊藻形成小菌落(P<；0.05)，显著增加铜绿微囊藻胞内多糖(IPS)和结合胞外多糖(BEPS)含量(P<；0.05)。在暴露前5min的快速吸附过程中，藻细胞对Cd(II)的截留量与培养物中Cd(II)的加入量呈线性关系。在10 d后，铜绿假单胞菌对加入Cd(II)的0.2 mg L−1的Cd(II)的截留率接近80%，而低Cd(II)添加浓度组的Cd(II)的截留率为93%。80%以上的Cd(II)被BEPS生物吸附。与铜绿假单胞菌菌落形成相关的外部和内部因素的Pearson相关系数表明，Cd(II)可通过增加Cd(II)的生物积累和生物吸附来刺激IPS和BEPS的产生。Cd(II)和BEPS之间的交联度增加刺激了藻细胞聚集，最终促进了微囊藻菌落的形成。
To investigate the sequestration and distribution characteristics of Cd(II) by Microcystis aeruginosa and its role in Microcystis colony formation, M. aeruginosa was exposed to six different Cd(II) concentrations for 10 days. Cd(II) exposure caused hormesis in the growth of M. aeruginosa. Low concentrations of Cd(II) significantly induced formation of small Microcystis colonies (P < 0.05) and increased the intracellular polysaccharide (IPS) and bound extracellular polysaccharide (bEPS) contents of M. aeruginosa significantly (P < 0.05). There was a linear relationship between the amount of Cd(II) sequestrated by algal cells and the amount added to cultures in the rapid adsorption process that occurred during the first 5 min of exposure. After 10 d, M. aeruginosa sequestrated nearly 80% of 0.2 mg L−1 added Cd(II), while >93% of Cd(II) was sequestrated in the groups with lower added concentrations of Cd(II). More than 80% of the sequestrated Cd(II) was bioadsorbed by bEPS. The Pearson correlation coefficients of exterior and interior factors related to colony formation of M. aeruginosa revealed that Cd(II) could stimulate the production of IPS and bEPS via increasing Cd(II) bioaccumulation and bioadsorption. Increased levels of cross-linking between Cd(II) and bEPS stimulated algal cell aggregation, which eventually promoted the formation of Microcystis colonies.
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