Growth inhibition of Microcystis aeruginosa and adsorption of microcystin toxin by the yeast Aureobasidium pullulans , w
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RESEARCH ARTICLE
Growth inhibition of Microcystis aeruginosa and adsorption of microcystin toxin by the yeast Aureobasidium pullulans, with no effect on microalgae Zakaria A. Mohamed 1
&
Saad Alamri 2,3 & Mohamed Hashem 2,4 & Yasser Mostafa 2
Received: 15 January 2020 / Accepted: 26 June 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract This study evaluates the inhibitory effect of a yeast strain, Aureobasidium pullulans KKUY0701, isolated from decayed cyanobacterial bloom against harmful cyanobacterium Microcystis aeruginosa and determines the ability of this strain to remove microcystin (MC) toxin from the water. The antialgal activity of this yeast strain was assayed by co-cultivation with M. aeruginosa, diatom, and green algal species. The MC adsorption experiment was conducted in the presence of living and heat-inactivated yeast cells. Both yeast cells and filtrates caused a rapid reduction in the growth of M. aeruginosa, with complete death and cell lysis occurring after 3 days. The yeast strain did not exhibit any inhibitory effect on either green algae or diatoms. Both living and heat-inactivated yeast cells were capable of adsorption of MC on their surfaces. Inactivated yeast exhibited higher adsorption capacity and lower intensity than living yeast for the adsorption of MC toxin. The results of this study suggest that this yeast strain could be employed to selectively reduce cyanobacterial blooms in freshwaters. Moreover, the application of heatinactivated yeast’s biomass for toxin adsorption gives new possibilities in drinking water treatment plants. Keywords Adsorption . Biological control . Lysis . Microcystis . Microcystin . Yeast
Introduction Cyanobacterial blooms are a common phenomenon in freshwater environments worldwide. Due to progressive eutrophication of aquatic ecosystems and climate change, cyanobacterial blooms are expected to increase in the future (Paerl and Otten 2013). Cyanobacterial blooms are frequently constituted by toxin-producing species which exert negative impacts on aquatic food webs (Codd et al. 2005) and Responsible Editor: Vitor Manuel Oliveira Vasconcelos * Zakaria A. Mohamed [email protected] 1
Department of Botany and Microbiology, Faculty of Science, Sohag University, Sohag 82524, Egypt
2
College of Science, Department of Biology, King Khalid University, P.O. Box 9004, Abha 61413, Saudi Arabia
3
Research Center for Advanced Materials Science (RCAMS), King Khalid University, P.O. Box 9004, Abha 61413, Saudi Arabia
4
Faculty of Science, Botany and Microbiology Department, Assiut University, Assiut 71516, Egypt
deteriorate the water quality for human use (Mohamed et al. 2015). Among blooming cyanobacteria, Microcystis aeruginosa is one of the most common and widespread species found in freshwater environments (Tanabe et al. 2018). In general, cyanobacterial blooms contain a diverse microbial community including viruses, bacteria, fungi, and some resistant zooplankters (Van Wichelen et al. 2016; Mohamed et al. 2018). Some of these m
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