Potential of extracellular enzymes from Trametes versicolor F21 a in Microcystis spp. degradation

Studies have shown that microorganisms may be used to eliminate cyanobacteria in aquatic environments. The present study showed that the white-rot fungus Trametes versicolor F21a could degrade Microcystis aeruginosa. After T. versicolor F21a and Microcystis spp. were co-incubated for 60 h, >96% of Micro cystis spp. cells were degraded by T. versicolor F21a. The activities of extracellular enzymes showed that cellulase, beta-glucosidase, protease, and laccase were vital to Microcystis spp. degradation in the early stage (Oh to 24 h), while beta-glucosidase, protease, laccase, and manganese peroxidase in the late stage (24 h to 60 h). The positive and significant correlation of the degradation rate with these enzyme activities indicated that these enzymes were involved in the degradation rate of Microcystis spp. cells at different phases. It suggested that the extracellular enzymes released by T. versicolor F21a might be vital to Microcystis spp. degradation. The results of this study may be used to develop alternative microbial control agents for cyanobacterial control. (C) 2014 Elsevier B.V. All rights reserved.