Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 13

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych:  wood decay fungi
help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
Dominant fungi, especially primary decayers, probably influence other fungi growing together with them. Fomitopsis pinicola is one of the important primary decayers, and it has been shown that several other species regularly co-occur together with it. We asked whether the presence of common species (especially F. pinicola) affects the species richness and composition of other fungi. This study was conducted in an old-growth mountain spruce forest in the Bohemian Forest, Czech Republic. We surveyed logs on the ground for sporocarps of fungi in three successive years. Characteristics of logs such as dimensions, stage of decay and the cause of tree death (wind, competition, butt rot, bark beetles and unascertained) were recorded. F. pinicola was abundant mostly on logs that originated from trees infested by bark beetles. Analysis of covariance with the volume of logs and decay stage as covariables showed significant effect of these covariables and of F. pinicola presence on species numbers – logs in middle decay stages with the sporocarps of F. pinicola had more species than other logs. Based on Canonical Correspondence Analysis with volume, decay stage and the cause of tree death as covariables, the species composition on logs was also influenced by F. pinicola. We found such statistical effects in several other species. Redlisted species Antrodiella citrinella and Camarops tubulina co-occurred with F. pinicola.
Quinine fungus (Laricifomes officinalis) is a typical monophagic species decaying in Central Europe nearly exclusively hardwood of trees from Larix genus. The main reason of these narrow trophic preferences is probably the specific chemical composition of Larch wood and, especially, the lack of some phenolic compounds that might play an important role as natural inhibitors of Quinine fungus growth. To improve this theory five different phenolic compounds selected basing on results of previous investigation and quantity analysis of phenolic compounds in wood of 25 different tree species were tested in laboratory conditions. They were as follows: 3’,5’-dimethoxyacethophenone, furanone, 2,6-dimethoxy-4(propenyl)phenol, syringe aldehyde and 1,4-buthanodiamine-2,3-dime­thoxy N,N,N’,N’tetramethyl. Wood samples saturated by solutions of this substances were exposed on the mycelium of L. officinalis. Results of this experiment compared with the range of control sample’s decay showed that all the tested phenolic compounds caused the decrease of the range of wood decomposition by L. officinalis. It means that they work as natural growth inhibitors of this fungus and probably are one of the reasons of its specific trophic preferences.
From research on the use of chiral ionic liquids with a natural origin substituenl for wood proteclion. Antifungal activities of chiral ionic liquids - menthoxymethylimidazolium derivates against brown-rot decay fungus (Coniophora puteana), white-rot decay fungus (Trametes versicolor) and blue-stain fungus (Sclerophoma pithyophila) were determined using screening agar-plate and agar-block methods. Results from antifungal tests revealed that 1-hexyl-3-[(1R,2S,5R)-(-)menthoxymethyl]imidazolium chloride exhibited the strongest antifungal activity against wood decay fungi (basidiomycetes) compared with the commercial didecyldimethylammonium chloride. Whereas compound with twelve carbons alkyl substituent has a weak antifungal activity. The infrared spectral analysis (FTIR ATR) confirmed that chiral imidazolium ionic liquids were built into the structure of the treated wood.
Fungi may cause internal decay, cankers, loosening of tissue and cell walls result into weak forks in the trunk and large branches. Tree rot may be associated with root decay, damage to foliage and fruits. Wood decay fungi isolated from Tamarindus indica were Daldinia concentrica, Schizophyllum commune, Flavodon flavus, Irpex hydnoides, and Phellinus fastuosus, in which D. concentrica causing canker rot is reported for the first time from India and F. flavus and I. hydnoides P. fastuosus are recorded for the first time on T. indica wood causing white rot. During canker rot, formation of bark canker and extensive internal decay of wood was observed; as a result the tree growing in the M.S. University campus became structurally unstable and broken off at the canker face. Early detection and removal of such hazardous branches of trees is advocated to avoid loss of life and property.
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.