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Phylogenetic Analysis and Detection on the Major Ligninolytic Enzymes System of Grifola frondosa

  • ITS sequence of Grifola frondosa strain qx2 was amplified and sequenced (GenBank accession number:GU584099), a phylogenetic analysis was performed on G. frondosa qx2 and its related white-rot fungi. The results showed that G. frondosa and G. sordulenta had the closest genetic relationship, and G. frondosa was closer to other several white-rot fungi. The strain was stilly cultured at 25 ℃ under 4 different kinds of LNAS (Low Nitrogen Asparagine Succinic acid) culture solution, the extracellular enzyme solutions were sampled at different interval, OD values of the solutions, representing manganese peroxidase (MnP), Laccase and lignin peroxidase (LiP) activities, were measured spectrophotometrically by monitoring the oxidation of 2,6-DMP at 470 nm, ABTS at 420 nm and veratryl alcohol(VA) at 310 nm, the lignin-degrading enzymes of the fungus and the relationships between enzyme activities and medium composition and substrates were gained. Results indicated that G. frondosa could produce MnP and Laccase simultaneously, but no Lip. Substrates wood sawdust could slightly enhanced MnP and Laccase activities. The biggest MnP and Laccase activity were 2.96 U·L-1 and 4.49 U·L-1 when no substrates were added, and 8.06 U·L-1 and 9.85 U·L-1 when substrates added.
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Phylogenetic Analysis and Detection on the Major Ligninolytic Enzymes System of Grifola frondosa

  • 1. School of Forestry , Northeast Forestry University , Harbin 150040, Heilongjiang, China

Abstract: ITS sequence of Grifola frondosa strain qx2 was amplified and sequenced (GenBank accession number:GU584099), a phylogenetic analysis was performed on G. frondosa qx2 and its related white-rot fungi. The results showed that G. frondosa and G. sordulenta had the closest genetic relationship, and G. frondosa was closer to other several white-rot fungi. The strain was stilly cultured at 25 ℃ under 4 different kinds of LNAS (Low Nitrogen Asparagine Succinic acid) culture solution, the extracellular enzyme solutions were sampled at different interval, OD values of the solutions, representing manganese peroxidase (MnP), Laccase and lignin peroxidase (LiP) activities, were measured spectrophotometrically by monitoring the oxidation of 2,6-DMP at 470 nm, ABTS at 420 nm and veratryl alcohol(VA) at 310 nm, the lignin-degrading enzymes of the fungus and the relationships between enzyme activities and medium composition and substrates were gained. Results indicated that G. frondosa could produce MnP and Laccase simultaneously, but no Lip. Substrates wood sawdust could slightly enhanced MnP and Laccase activities. The biggest MnP and Laccase activity were 2.96 U·L-1 and 4.49 U·L-1 when no substrates were added, and 8.06 U·L-1 and 9.85 U·L-1 when substrates added.

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