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Water 2017, 9(11), 859; doi:10.3390/w9110859

Effects of Climate Change on 2-Methylisoborneol Production in Two Cyanobacterial Species

Beijing Climate Change Response Research and Education Center, Beijing University of Civil Engineering and Architecture, Beijing 100044, China
Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100019, China
Authors to whom correspondence should be addressed.
Received: 24 September 2017 / Revised: 30 October 2017 / Accepted: 2 November 2017 / Published: 22 November 2017
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2-Methylisoborneol (2-MIB) is a common off-flavor metabolite, and it has a very low odor threshold value. 2-MIB is produced by a variety of cyanobacteria and heterotrophic bacteria. In this study, Dolichospermum spiroides (Anabaena spiroides, FACHB 498) and Planktothrix sp. (FACHB 1371) were investigated. The influence of high temperature (27, 35, and 40 °C) and dissolved inorganic carbon (DIC, 18.4, 27.5, and 36.7 mg/L) on the two 2-MIB-producing cyanobacteria were simulated to study the effect of climate change on 2-MIB production. DIC had an effect on 2-MIB production by Planktothrix sp. The results showed that the highest DIC concentration (36.7 mg/L) led to the fastest algal growth, which increased 2-MIB production by Planktothrix sp. However, 40 °C killed all the cyanobacteria. The higher temperature (35 °C) shortened the lifecycle of the two cyanobacteria because it moved forward their logarithmic phase compared to 27 °C. The 2-MIB-producing potential of Dolichospermum spiroides may increase at 35 °C. The Dolichospermum spiroides results showed that the fluorescence intensity and the concentration of extracellular 2-MIB were highly correlated (r2 ≥ 0.90). At 35 °C, there was a stronger correlation between extracellular dissolved organic matters’ (DOMs, fulvic acid (P3 (r2 = 0.90)), humic acid (P4 (r2 = 0.92)) and the soluble microbial metabolites’ (P5 (r2 = 0.71)) fluorescence peak intensities and 2-MIB concentration. The Dolichospermum sproides 2-MIB-producing potential was affected by extracellular humus. The Planktothrix sp. 2-MIB-producing potential declined in general over the growth period. In addition, temperature had no significant effect on the Planktothrix sp. 2-MIB-producing potential and the extracellular 2-MIB component. View Full-Text
Keywords: 2-methylisoborneol; dissolved inorganic carbon; Dolichospermum spiroides; Planktothrix sp.; climate change 2-methylisoborneol; dissolved inorganic carbon; Dolichospermum spiroides; Planktothrix sp.; climate change

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Zhang, J.; Li, L.; Qiu, L.; Wang, X.; Meng, X.; You, Y.; Yu, J.; Ma, W. Effects of Climate Change on 2-Methylisoborneol Production in Two Cyanobacterial Species. Water 2017, 9, 859.

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