In this work the effect of white-rot fungi, A. biennis, C. unicolor, T. versicolor and G. odoratum, and 2,5-dimethylaniline induced extracellular laccase on the transformation of chlorinated pollutants, pentachlorophenol (PCP) and 2-chlorophenol (2CP), was examined. SummaryThe effects of pentachlorophenol (PCP) and 2-chlorophenol (2CP) on white rot fungi, Abortiporus biennis, Cerrena unicolor, Gloeophyllum odoratum, and Trametes versicolor were investigated. With the exception of C. unicolor and A. biennis, concentrations of PCP higher than 50 ppm inhibited fungal growth completely. However, extreme concentrations of PCP (500 ppm) caused a 61 % increase in growth of C. unicolor compared to the control culture within 14 days. When initial PCP concentrations were 50 ppm A. biennis and C. unicolor achieved, respectively, 87 % and 78 % of chlorophenol transformation within 3 days. However, when 2,5-dimethylaniline (0.2mM) was added to the C. unicolor culture, 98 % of PCP transformation was achieved after one hour. Under the same conditions, A. biennis transformed 44 % of PCP. Both chlorophenols are completely removed, when laccase activity reaches its maximum. In conclusion, among the four fungi investigated, C. unicolor and A. Biennis were very effective in transforming PCP and 2-CP. This biotransformation was greatly intensified by 2,5-dimethylaniline and accompanied by an increase in laccase activity. KeywordsLaccase 2,5-Dimethylaniline Abortiporus biennis Cerrena unicolor Gloeophyllum odoratum Trametes versicolor White-rot fungi Pentachlorophenol 2-Chlorophenol Brought to you by | HEC Bibliotheque Maryriam ET J.

. (2015). Ophiostomatoid fungi and their roles in Quercus robur die-back in Tellermann forest, Russia. Silva Fennica vol. 49 no. 5 article id 1328. 16 p. Highlights• Dominant ophiostomatoid fungi associated with Q. robur in the post-outbreak region of oak die-back were investigated.• Ophiostoma quercus was the most commonly encountered fungus.• This is the first report of O. grandicarpum from Russia.• The results of preliminary pathogenicity experiments demonstrate that fungi investigated in this study are unlikely to play causal role in oak die-back Pathogenicity of these fungi was tested using artificial inoculations on Q. robur trees. The fungi were shown to be non-pathogenic and unlikely to play any role in oak die-back. These fungi are most likely only components in a complex of abiotic, biotic and anthropogenic factors that have contributed to a die-back of Quercus spp. in Russia.