Growth inhibition of Microcystis aeruginosa and adsorption of microcystin toxin by the yeast Aureobasidium pullulans, with no effect on microalgae

Recent Advances in the Research on the Anticyanobacterial Effects and Biodegradation Mechanisms of Microcystis aeruginosa with Microorganisms

“…It has been reported that the fungus Trichaptum abietinum 1302BG can eliminate four cyanobacteria directly including M. aeruginosa FACH-918 and M. aeruginosa PCC 7806 in 48 h [106]. Some other fungi such as Trichoderma citrinoviride [6], Penicillium chrysogenum [97], Aureobasidium pullulans KKUY070 [98], Lopharia spadicea [99], Phanerochaete chrysosporium [100,101], Irpex lacteus T2b [102], Trametes versicolor F21a [107] and Bjerkandera adusta T1 [103] also show good inhibitory activities against M. aeruginosa. It has been stated that T. citrinoviride and A. pullulans have highly specific anticyanobacterial effects towards Microcystis spp.…”

“…It has been stated that T. citrinoviride and A. pullulans have highly specific anticyanobacterial effects towards Microcystis spp. while they have an insignificant effects on the green algae or diatoms [6,98]; furthermore, the biodegradation of M. aeruginosa cells may be due to the excretion of the lytic enzyme (N-β-acetylglucosaminidas) [98], which can degrade the peptidoglycan from the cyanobacterial cell wall. The extracellular enzymes of cellulase, β-glucosidase, protease, and laccase from T. versicolor F21a have also been proven to be responsible for the degradation of Microcystis spp.…”

“…Fungi have the natural ability to destroy Microcystis cells by secreting anticyanobacterial substances or through "cell to cell" contact. Apart from the growth inhibition and cell lysis of M. aeruginosa, some fungi are able to remove microcystins [6,98,106], and the removal mechanism is related to the adsorption/biodegradation of fungus or the inhibition expression of microcystins synthesis gene [15].…”

Bioremoval of Cylindrospermopsis raciborskii cells and cylindrospermopsin toxin in batch culture by the yeast Aureobasidium pullulans

“…KKUY0701 yeast strain used in experiments was isolated previously from Saudi eutrophic lake, identi ed as Aureobasidium pullulans based on 26S rDNA gene analysis, and assigned as KKUY0701 strain (accession number MK141707) (Mohamed et al 2020). The axenic strain was inoculated into a 250-ml sterile conical ask containing sterile nutrient yeast extract-malt extract agar medium (YMA; 100 mL).…”

“…This indicates that this fungus would be a promising candidate to control HCBs in water bodies. Recent study showed that the yeast A. pullulans sppresed the cell proliferation of M. aeruginosa and eliminated microcystin toxins via adsorption onto its cell walls (Mohamed et al 2020). As C. raciborskii frequently coexists in the same environment with M. aeruginosa, we hypothesized that A. pullulans yeast could have the same inhibitory effects on C. raciborskii.…”