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Open AccessArticle

Effects of Light Intensity and Exposure Period on the Growth and Stress Responses of Two Cyanobacteria Species: Pseudanabaena galeata and Microcystis aeruginosa

1
Graduate School of Science and Engineering, Saitama University, 255 Shimo-okubo, Sakura-ku, Saitama 338-8570, Japan
2
Institute for studies of the Global Environment, 7-1 Sophia University, Kioicho, Chiyoda, Tokyo 102-0094, Japan
3
Institute Hydro Technology Institute, 4-3-1 Shiroyama Trust Tower, Tranomon, Minato, Tokyo 105-0001, Japan
4
Research and Development Center, Nippon Koei, 2304 Inarihara, Tsukuba, Ibaraki 300-1259, Japan
5
Provincial Government, Ministry of Physical Infrastructure Development, Gandaki Province, Pokhara 33700, Nepal
6
Department of Agronomy, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh
*
Author to whom correspondence should be addressed.
Water 2020, 12(2), 407; https://doi.org/10.3390/w12020407
Received: 29 November 2019 / Revised: 28 January 2020 / Accepted: 31 January 2020 / Published: 3 February 2020
(This article belongs to the Special Issue Advancing Knowledge on Cyanobacterial Blooms in Freshwaters)
Light is an important factor that affects cyanobacterial growth and changes in light can influence their growth and physiology. However, an information gap exists regarding light-induced oxidative stress and the species-specific behavior of cyanobacteria under various light levels. This study was conducted to evaluate the comparative effects of different light intensities on the growth and stress responses of two cyanobacteria species, Pseudanabaena galeata (strain NIES 512) and Microcystis aeruginosa (strain NIES 111), after periods of two and eight days. The cyanobacterial cultures were grown under the following different light intensities: 0, 10, 30, 50, 100, 300, and 600 μmol m−2 s−1. The optical density (OD730), chlorophyll a (Chl-a) content, protein content, H2O2 content, and the antioxidative enzyme activities of catalase (CAT) and peroxidase (POD) were measured separately in each cyanobacteria species. P. galeata was negatively affected by light intensities lower than 30 μmol m−2 s−1 and higher than 50 μmol m−2 s−1. A range of 30 to 50 μmol m−2 s−1 light was favorable for the growth of P. galeata, whereas M. aeruginosa had a higher tolerance for extreme light conditions. The favorable range for M. aeruginosa was 10 to 100 μmol m−2 s−1. View Full-Text
Keywords: cyanobacterial growth; stress responses; Pseudanabaena galeata; Microcystis aeruginosa; oxidative stress; antioxidative enzymes cyanobacterial growth; stress responses; Pseudanabaena galeata; Microcystis aeruginosa; oxidative stress; antioxidative enzymes
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Muhetaer, G.; Asaeda, T.; Jayasanka, S.M.D.H.; Baniya, M.B.; Abeynayaka, H.D.L.; Rashid, M.H.; Yan, H. Effects of Light Intensity and Exposure Period on the Growth and Stress Responses of Two Cyanobacteria Species: Pseudanabaena galeata and Microcystis aeruginosa. Water 2020, 12, 407.

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