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Calcium promotes formation of large colonies of the cyanobacterium Microcystis by enhancing cell-adhesion

机译：钙通过增强细胞粘附促进微囊藻蓝藻大菌落的形成

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摘要

Large Microcystis colonies can lead to the rapid formation of surface accumulations, which are a globally significant environmental issue. Laboratory studies have shown that Ca2+ can quickly promote non-classical Microcystis colony formation via cell-adhesion, but our knowledge of the changes in the morphology of these colonies during subsequent long-term culture with Ca2+ is limited. In this study, a 72-day cultivation experiment was conducted to determine the long-term effects of Ca2+ on Microcystis colony formation. Laboratory results indicate that Ca2+ causes Microcystis to rapidly aggregate and form a colony through cell adhesion, then colony formation by cell-adhesion lost dominance, owing to the decrease in Ca2+ concentrations caused by precipitation/complexation. Although the initial colony morphology by cell adhesion is sparse, the newly divided cells, without separating from the mother cells, constantly fill the gaps in the original colony at Ca2+ concentrations > 40 mg L-1 for a long time, which creates colonies on day 72 with a morphology similar to that of M. ichthyoblabe in Lake Taihu. If the Ca2+ levels in Lake Taihu continue to increase, Microcystis growth rate will decrease only slightly, while the colony proportion of total biovolume and biomass will increase. Moreover, higher Ca2+ concentrations do not affect microcystin content, but promote the content of bound extracellular polysaccharides (bEPS), enabling formation of larger colonies, which may promote Microcystis surface accumulation.
机译：大的微囊藻菌落会导致表面积累的迅速形成，这是全球性的重大环境问题。实验室研究表明，Ca2 +可以通过细胞粘附快速促进非经典微囊藻菌落的形成，但是我们对随后的Ca2 +长期培养过程中这些菌落形态变化的了解有限。在这项研究中，进行了72天的培养实验，以确定Ca2 +对微囊藻菌落形成的长期影响。实验室结果表明，Ca2 +使微囊藻迅速聚集并通过细胞粘附形成菌落，然后由于沉淀/复合作用导致Ca2 +浓度降低，细胞粘附引起的菌落形成失去了优势。尽管最初通过细胞粘附产生的菌落形态很稀疏，但新分裂的细胞没有与母细胞分离，而是长时间以Ca2 +浓度> 40 mg L-1不断填充原始菌落中的空隙，从而在一天中形成菌落。 72的形态与太湖中的ichichyoblabe相似。如果太湖中的Ca2 +水平继续增加，微囊藻的增长率将仅略有下降，而总生物量和生物量的菌落比例将增加。此外，较高的Ca2 +浓度不会影响微囊藻毒素的含量，但会提高结合的胞外多糖（bEPS）的含量，从而形成较大的菌落，从而可能促进微囊藻的表面积聚。

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  • 来源
    《Harmful Algae》 |2020年第2期|101768.1-101768.8|共8页
  • 作者

    Chen Huaimin; Lurling Miguel;

  • 作者单位

    Hohai Univ Coll Environm 1 Xikang Rd Nanjing 210098 Peoples R China|Wageningen Univ Dept Environm Sci Aquat Ecol & Water Qual Management Grp POB 47 NL-6700 AA Wageningen Netherlands;

    Wageningen Univ Dept Environm Sci Aquat Ecol & Water Qual Management Grp POB 47 NL-6700 AA Wageningen Netherlands;

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  • 正文语种 eng
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  • 关键词

    Microcystis; Colony formation; Ca-2(+); Cell adhesion; Colony morphology;

    机译：微囊藻;菌落形成;Ca-2（+）;细胞粘附;菌落形态;

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