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Enzyme profile in samples of bacterial cellulose film treated with Trametes versicolor and Coniophora puteana

Betlej Izabela

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

2021

No. 116

141--147

Profile of enzymes in samples of bacterial cellulose film treated with Trametes versicolor and Coniophora puteana. The paper presents the results of research showing the profile of hydrolytic enzymes synthesized by fungi that cause decomposition of wood during growth on film samples made of bacterial cellulose. The performed analyzes allowed for the conclusion that the presence of cellulose in the culture medium stimulates the fungal cells to synthesize full groups of enzymes that are not produced on the agar-maltose medium. Among the synthesized enzymes, both species of fungi produced two enzymes: β - glucosidase and N-acetyl-β - glucuronidase with the highest observed activity.

Profil enzymów w próbkach folii celulozy bakteryjnej, poddanych działaniu grzybów Trametes versicolor oraz Coniophora puteana. W pracy przedstawiono wyniki badań obrazujące profil enzymów hydrolitycznych, syntetyzowanych przez grzyby powodujące rozkład drewna w trakcie wzrostu na próbkach folii wytworzonych z celulozy bakteryjnej. Wykonane analizy pozwoliły na stwierdzenie, że obecność celulozy w podłożu hodowlanym stymuluje komórki grzybów do syntezy pewnych grup enzymów, które nie są wytwarzane na podłożu agarowo-maltozowym. Spośród syntetyzowanych enzymów obydwa gatunki grzybów wytwarzały enzymy: β – glukozydazę i N-acetylo- β – glukuronidazę o najwyższej, stwierdzonej aktywności.

Colonization by fungi of wood chips stored in industrial conditions

Kropacz A., Fojutowski A.

Drewno : prace naukowe, doniesienia, komunikaty

2014

vol. 57, nr 193

69--80

The long-term storage of chips in the form of piles visibly decreases the quality of this material. The aim of the research was to identify the colonization by fungi of forest chips intended for energy purposes and the growth of fungi, as well as the changes they can cause in wood during the storage of chips. The first sample for biological tests was taken when a test pile was being raised on the premises of a power plant (the initial state) and successive samples were taken from the inside of the pile after 30, 60 and 120 days of storage. The surfaces of the samples were observed using a stereoscopic microscope. Wood inocula, taken from the inside of the samples, were placed on a sterile culture medium, incubated for 10 days, and then observed under a microscope. Numerous filamentous fungi, responsible for the soft rot of wood, were isolated from the samples taken when the pile was raised and after 30 and 60 days of storage; however, no traces of decay in these chips were observed under the microscope. For the first time, fungi belonging to the Basidiomycetes class were observed on chips taken from the pile after 120 days. Hence, it is only after 120 days that some of the changes in chip quality, signalised by a decrease in mass, may be connected with the growth of Basidiomycetes.