Growth inhibition of Microcystis aeruginosa by white-rot fungus Lopharia spadicea

摘要

Harmful cyanobacterial blooms cause water deterioration and threaten human health. It isnnecessary to remove harmful cyanobacteria with useful methods. A bio-treatment may be one ofnthe best ways to do this. A strain of specific white-rot fungus, Lopharia spadicea, with algicidalnability was isolated. Its algicidal ability on algae under various conditions was determined usingnthree main influence factors: initial chlorophyll-a content, initial pH, and algal cell mixture.nThe result showed that the chlorophyll-a content of Microcystis aeruginosa FACHB-912,nOocystis borgei FACHB-1108, and Microcystis flos-aquae FACHB-1028 decreased from 798 ^ 13,n756 ^ 40, and 773 ^ 24mg/L to 0 within 39 h. L. spadicea could also remove more than 95%nchlorophyll-a when initial chlorophyll-a content increased from 397 ^ 13 to 2,132 ^ 4mg/L.nMoreover, the strain has great removal ability under a broad initial pH range of 5.5 to 9.5. Thenchlorophyll-a content of the three algal strain mixtures decreased from about 672 ^ 23mg/L ton0 within 45 h. After superoxide dismutase (SOD) and malondialdehyde (MAD) were assessed in anco-culture of L. spadicea, it was observed that an increase in MAD content was correlated withnthe decrease in chlorophyll-a content of M. aeruginosa FACHB-912. This result suggested that thenalgae was not only greatly inhibited but also severely damaged by the fungus.