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Wyszukujesz frazę "Dahm, H." wg kryterium: Autor

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    Wyświetlanie 1-8 z 8
    Tytuł:
    Bakterie towarzyszące mikoryzom i ich rola w funkcjonowaniu symbiozy
    Bacteria associated with mycorrhizae and their role in the functioning of symbiosis
    Autorzy:
    Dahm, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1011991.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    bakterie towarzyszace
    grzyby mikoryzowe
    bakterie wspomagajace mikoryzy
    mikoryza
    ektomikoryza
    lesnictwo
    mikrobiologia
    ectomycorrhiza
    mycorrrhization helper bacteria
    Opis:
    This paper presents influence of rhizosphere bacteria on the physiological relations between roots of trees and mycorrhizal fungi, considering mainly positive role of bacteria (mycorrhization helper bacteria).
    Źródło:
    Sylwan; 2009, 153, 02; 134-139
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wplyw grzybow ektendomikoryzowych i bakterii dwuazotroficznych na siewki sosny [Pinus sylvestris L.] - in vitro
    Autorzy:
    Redlak, K.
    Dahm, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/817741.pdf
    Data publikacji:
    2001
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    ektendomikoryza
    grzyby mikoryzowe
    bakterie dwuazotroficzne
    mikoryza
    sosna zwyczajna
    lesnictwo
    siewki
    badania in vitro
    Pinus sylvestris
    drzewa lesne
    Źródło:
    Sylwan; 2001, 145, 03; 81-91
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Enzymatic activity of actinomycetes from the genus Streptomyces isolated from the bulk soil and rhizosphere of the Pinus sylvestris
    Autorzy:
    Golinska, P.
    Dahm, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/41609.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    enzyme activity
    Actinomycetes
    Streptomyces
    isolation
    bulk soil
    forest soil
    rhizosphere
    Pinus sylvestris
    chitinase
    protease
    pectinase
    cellulase
    Opis:
    The enzymatic activity (chitinolytic, proteolytic, pectolytic andcellulolytic) of twenty strains of Streptomyces isolated from soil and rhizosphere of Scots pine was analyzed. Most strains produced chitinases, catalyzing the degradation of chitin, the main component of fungal cell walls including fungi pathogenic for plants. This activity was about 4 times higher in the presence of Fusariumoxysporum than Rhizoctonia solani mycelium or chitin flakes. The number of the proteolytic strains was also significant. In general, rhizosphere and soil organisms synthesizedcomparable amounts of these enzymes. Over half of the analyzed Streptomyces strains produced pectolytic enzymes (polygalacturonase, pectin lyase and pectate lyase). This property was more common among rhizosphere than among soil strains. The Streptomyces strains also showedcellulolytic activity (endocellulases, exocellulases) – enzymes decomposing basic components of cell walls of plant and lower fungi (cellulose). The cellulolytic activity was differentiated and depended on the Streptomyces strain. Conclusion of our studies is that Streptomyces are the microorganisms more chitinolytic andproteolytic than pectolytic and cellulolytic.
    Źródło:
    Dendrobiology; 2011, 65
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Occurrence of actinomycetes in forest soil
    Autorzy:
    Golinska, P.
    Dahm, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/41633.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Opis:
    Actinomycetes from the genus Streptomyces are Gram-positive bacteria commonly and in large numbers isolated from the soil, which is their natural habitat. Due to their metabolic activity and high adaptative capabilities they are an important link in the circulation of matter and energy. They play an important role in the formation of bioactive metabolites, mainly antibiotic compounds. In contrast to numerous elaborations concerning actinomycetes of cultivated soils, little is known about their occurrence in forest soils. The main factor limiting actinomycete development in forest soils is believed to be the low pH, as the development of most actinomycetes is facilitated by a neutral or alkaline soil reaction. However, these microorganisms have also been isolated from strongly acidic soils, which was confirmed in our studies. The pH value of analysed soils was in the range 4.0–4.3 (4.0 for bulk soil of alder; 4.1 for bulk soil of Scots pine; 4.3 for bulk soil of birch). Root soil of the analyzed trees contained more microorganisms than soil outside the range of the roots. This also concerned actinomycetes, eubacteria as well as saprophytic fungi. In our investigations the greatest number of eubacteria were connected with the alder (bulk soil, rhizosphere and rhizoplane), and the smallest number with the pine, whereas actinomycetes were the most numerous in the birch rhizosphere. The analyzed actinomycete strains were identified to 18 taxa, with a dominant species Streptomyces exfoliatus.
    Źródło:
    Dendrobiology; 2011, 66
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Antagonistic properties of Streptomyces isolated from forest soils against fungal pathogens of pine seedlings
    Autorzy:
    Golinska, P.
    Dahm, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/41547.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Opis:
    Biological control of plant diseases has received worldwide attention in recent years mainly as a response to use of hazardous chemicals in the environment. Soil actinomycetes particularly Streptomyces spp. enhance soil fertility and have antagonistic activity against wide range of soil-borne plant pathogens. In study of antifungal activity of streptomycetes against plant fungal-pathogens Fusarium oxysporum (Schlecht.), F. culmorum (Wm. G. Sm.) Sacc. and Rhizoctonia solani (Kühn) causing damping-off of pine seedlings, in vitro and in vivo tests were carried out. Two types of in vitro tests in mixed cultures of actinomycetes and fungi were performed. In majority of the cases, an inhibitory effect of actinomycetes on fungi was noticed. Three isolates (SG9, SR2, SR4) were highly active against pathogenic fungi and were chosen for exopolysaccharides extraction and in vivo tests. The sensitivity to exopolysaccharide action was noted in fungi from the genus Fusarium. Fusarium oxysporum showed a higher sensitivity to the analyzed exopolysaccharides than F. culmorum. Biocontrol interactions both in sterile and non-sterile soil were found for the actinomycete Streptomyces cyaneus (strain SG9) isolated from root free soil of the pine. The latest experiment confirmed the strong pathogenicity of the fungus Rhizoctonia solani. Antifungal properties of Streptomyces cyaneus (strain SG9) need further comprehensive studies.
    Źródło:
    Dendrobiology; 2013, 69
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Myxobacteria as a potential biocontrol agent effective against pathogenic fungi of economically important forest trees
    Autorzy:
    Dahm, M.
    Brzezinska, A.J.
    Wrotniak-Drzewiecka, W.
    Golinska, P.
    Rozycki, H.
    Rai, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/41479.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Opis:
    The broad biocontrol properties of myxobacteria (mainly members of the genera Corallococcus and Myxococcus) isolated from forest soils against main fungal pathogens of pine seedlings were estimated. Among the myxobacterial strains studied (in vivo tests), the strongest antagonism towards fungi was noticed for the strains of the species Myxococcus virescens Thaxter and Corallococcus exiguus Reichenbach. They inhibited the fungal growth within the range 38–63%. The strongest inhibitory reaction towards Cylindrocarpon destructans (Zinssm.) Scholten was observed. A predominating part of myxobacteria (22 from among 30) inhibited the growth of Rhizoctonia solani Kühn. Myxobacteria suppressed any pathogenic action of Rhizoctonia solani (strain 411) towards Scots pine seedlings (in vitro tests). They produced extracellular (but not intracellular) acidic and neutral proteinases. None of the myxobacterial strain under examination produced chitinases. The 57% of the myxobacterial strains studied produced siderophores. The numbers of myxobacterial strains, obtained from under forest trees were in the following order: Betula pendula Roth. > Pinus sylvestris L. > Alnus glutinosa Gaertn. = Quercus robur L. The results gained in present work have proved potential use of myxobacteria as biocontrol agents against Rhizoctonia solani, common fungal pathogen of pine seedlings.
    Źródło:
    Dendrobiology; 2015, 74
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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