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Int. J. Environ. Res. Public Health 2018, 15(9), 1954; https://doi.org/10.3390/ijerph15091954

Relationship between Photosynthetic Capacity and Microcystin Production in Toxic Microcystis Aeruginosa under Different Iron Regimes

1,2
,
1,2,* , 1,2
,
1,2
,
1,2
and
1,2
1
Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing 210098, Jiangsu, China
2
College of Environment, Hohai University, Nanjing 210098, Jiangsu, China
*
Author to whom correspondence should be addressed.
Received: 23 July 2018 / Revised: 25 August 2018 / Accepted: 5 September 2018 / Published: 7 September 2018
(This article belongs to the Special Issue Water Quality Improvement and Ecological Restoration)
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Abstract

Blooms of harmful cyanobacteria have been observed in various water bodies across the world and some of them can produce intracellular toxins, such as microcystins (MCs), which negatively impact aquatic organisms and human health. Iron participates significantly in cyanobacterial photosynthesis and is proposed to be linked to MC production. Here, the cyanobacteria Microcystis aeruginosa was cultivated under different iron regimes to investigate the relationship between photosynthetic capacity and MC production. The results showed that iron addition increased cell density, cellular protein concentration and the Chl-a (chlorophyll-a) content. Similarly, it can also up–regulate photosynthetic capacity and promote MC–leucine–arginine (MC–LR) production, but not in a dose–dependent manner. Moreover, a significant positive correlation between photosynthetic capacity and MC production was observed, and electron transport parameters were the most important parameters contributing to the variation of intracellular MC–LR concentration revealed by Generalized Additive Model analysis. As the electron transport chain was affected by iron variation, adenosine triphosphate production was inhibited, leading to the alteration of MC synthetase gene expression. Therefore, it is demonstrated that MC production greatly relies on redox status and energy metabolism of photosynthesis in M. aeruginosa. In consequence, more attention should be paid to the involvement of photosynthesis in the regulation of MC production by iron variation in the future. View Full-Text
Keywords: cyanobacterial growth; iron; microcystin production; Microcystis aeruginosa; photosynthetic capacity cyanobacterial growth; iron; microcystin production; Microcystis aeruginosa; photosynthetic capacity
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Wang, X.; Wang, P.; Wang, C.; Qian, J.; Feng, T.; Yang, Y. Relationship between Photosynthetic Capacity and Microcystin Production in Toxic Microcystis Aeruginosa under Different Iron Regimes. Int. J. Environ. Res. Public Health 2018, 15, 1954.

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