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Trophic Abilities of Trametes Gibbosa (Polyporales, Basidiomycota) With Respect to The Wood of Fagus Sylvatica

Piętka Jacek, Szczepkowski Andrzej, Ronikier Michał, Saługa Marta

Drewno : prace naukowe, doniesienia, komunikaty

2023

Vol. 66, nr 211

Art. no. 1644-3985.413.08

Trametes gibbosa is a widespread polypore fungus occurring throughout Europe and Asia. It is considered a saprotroph occasionally exhibiting parasitic activity. The aims of the present experimental work were to: (1) determine the ability of T. gibbosa pure culture to decompose beech wood under laboratory conditions, (2) test the trophic abilities of T. gibbosa by comparative analysis of the development of its mycelium inoculated into the stems of living beech trees and into beech rollers (stem segments - dead substrate). The laboratory wood decay experiment revealed considerable weight loss of the beech wood samples exposed to T. gibbosa (32.7% after 120 days). Identification of the mycelium used for inoculation in natural forest conditions was done by morphological analysis of the cultures and molecular barcoding. Attempts to recover T. gibbosa mycelium were made after two and eight years for the living trees, and after two years for the rollers. While T. gibbosa could not be reisolated from the inoculated beech trees, basidiomata were observed on the beech rollers, and genetically verified T. gibbosa mycelium was extracted from them. We conclude that T. gibbosa exhibits strong saprotrophic inclinations.

Microscopic investigations concerning in situ oxalate formation by the brown-rot fungus Poria placenta

Lenz C., Melcher E., Möller R., Lautner S.

Drewno : prace naukowe, doniesienia, komunikaty

2017

vol. 60, nr 199

5--19

Basidiomycete fungi are important organisms for the biodegradation of wood. A main distinguishing feature of many brown-rot fungi is their ability to produce large quantities of oxalic acid. It is well known that the reaction between copper and oxalic acid can result in a detoxification of copper containing wood preservatives, due to the formation of insoluble copper oxalate. However, little information is available regarding the mechanism on a cellular level. The aim of this investigation was to determine in situ copper oxalate formation in order to localise the exact place of precipitation by means of light microscopy and scanning electron microscopy analysis. Additionally, the growth dynamics and minimal inhibitory concentrations on malt extract agar were investigated. Further, energy-dispersive X-ray analysis was used to obtain information about element distribution. Hereby a relative ion concentration not only of copper, but also calcium was measured in the hypha and the surrounding wood tissue. These results are helpful for a better understanding of metabolic strategies in the detoxification of copper in wood impregnated with protective agents.