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Showing papers on "Trichoderma longibrachiatum published in 1990"


Journal ArticleDOI
TL;DR: Xylose oligomers rapidly induced xylanase activity of Trichoderma longibrachiatum, whereas induction was delayed in the presence of glucose, and mixtures of xylobiose with cellobiose or cellopentaose rapidly induced cellulase activity.
Abstract: Xylose oligomers rapidly induced xylanase activity of Trichoderma longibrachiatum, whereas induction was delayed in the presence of glucose. Cellobiose, cellopentaose, and xylobiose did not induce detectable levels of cellulase activity. However, mixtures of xylobiose with cellobiose or cellopentaose rapidly induced cellulase activity. In addition, mixtures of xylobiose with cellopentaose or cellobiose induced xylanase activity more effectively than xylobiose alone. Both xylanase and cellulase activity were detected after a lag period in the presence of lactose.

65 citations


Patent
05 Oct 1990
TL;DR: The feed additive for poultry comprises a cellulase or a xylanase producible by means of selected strains of Humicola insolens and Trichoderma longibrachiatum as mentioned in this paper.
Abstract: The feed additive for poultry comprises a cellulase or a xylanase producible by means of selected strains of Humicola insolens and Trichoderma longibrachiatum. By means of this additive the malabsorption syndrome is effectively alleviated.

45 citations


Journal ArticleDOI
TL;DR: Three isolates of Gliocladium virens and two of Trichoderma longibrachiatum were screened against isolate of three soilborne plant pathogens namely Rhizoctonia solani, Sclerotium rolfsii and Pythium aphanidermatum and G. virens exhibited stronger hyperparasitism and wider biological spectrum than T. longibraciatum.
Abstract: Three isolates of Gliocladium virens (G1, G2 and G3) and two of Trichoderma longibrachiatum (T1 and T2) were screened against isolates of three soilborne plant pathogens namely Rhizoctonia solani, Sclerotium rolfsii and Pythium aphanidermatum. G. virens exhibited stronger hyperparasitism and wider biological spectrum than T. longibrachiatum. Further, similarities as well as variation was observed in the ability of the various isolates to invade the test pathogens in dual culture. For the hyperparasites, acidic pH range (5.0 to 5.5) favoured both growth and spore germination. The hyperparasites made direct contact with the pathogens followed by varied modes of attack invariably leading to cell disruption. Antagonists, G1 and G3 revealed strong antibiosis while T2 showed moderate effect. All the isolates produced enhanced levels of lytic enzymes adaptively and there were marked differences among them. However, no correlation was observed between these attributes and the hyperparasitic potential of the various isolates in dual culture. The relevance and the role of enzymes and toxic metabolite(s) in the antagonism of G. virens and T. longibrachiatum to these pathogens are discussed.

19 citations



Patent
31 Aug 1990
TL;DR: A compound expressed by the formula (X is Cl or Br) can be used as an anti-fungus agent or anti-tumor agent as discussed by the authors, which can be expressed as:
Abstract: NEW MATERIAL:A compound expressed by the formula (X is Cl or Br). USE:Anti-fungus agent or anti-tumor agent. PREPARATION:Microorganism [e.g. Trichoderma longibrachiatum) KAC-13125 (FERM BP-1824)] belonging to genus Trichodermae and having producibility of a compound containing Cl as the group X in the formula is cultured in a medium by preferably submerged stirring culturing method at 22-30 deg.C and pH5-7 of medium for 1-7 day.

3 citations


Journal ArticleDOI
TL;DR: Observations showed that the properties of the investigated fungus are those which characterize other Trichoderma species as well.
Abstract: Physiological properties of the fungus Trichoderma longibrachiatum Rifai and its pathogenicity for maize seedling and young maize plants In the 1977–1980 period Trichoderma longibrachiatum was found to make 1.7 % of the maize seed mycoflora in Slovenia/Yugoslavia. Its mycelium growth was investigated on complex as well as on defined substrates with regard to spore formation, light induction (which is indispensable for spore formation), temperature requirements, relative humidity and different C- and N-sources. These observations showed that the properties of the investigated fungus are those which characterize other Trichoderma species as well.

2 citations


Book ChapterDOI
01 Jan 1990
TL;DR: It is demonstrated that a number of microorganisms appearing to be suitable for such purpose can convert either xylose, an enzymatic oligomeric digest of xylan, a mineral acid hemicellulose hydrolysate, or a five monosaccharide mixture simulating sulfite process liquors, to EPS.
Abstract: A program concerning the conversion of hemicellulosic residues to extracellular polysaccharides (EPS) with favorable application properties has been initiated. A number of microorganisms including Cryptococcus laurentii, Klebsiella pneumoniae, Arthrobacter viscosus, a Pseudomonas sp., and an as-yet-unidentified phylloplane isolate (DS-1) appear to be suitable for such purpose. We have demonstrated that these isolates can convert either xylose, an enzymatic oligomeric digest (Trichoderma longibrachiatum) of xylan, a mineral acid hemicellulose hydrolysate, or a five monosaccharide mixture simulating sulfite process liquors, to EPS. Several physiological parameters relating to maximizing acidic (hexadecyltrimethylammonium-precipitable) EPS are detailed. Under optimum conditions, up to ca. 14 gm/1 of EPS has been obtained. Following additional purification steps, the molecular weight distributions (600–4500 Kd) of the EPS so formed were estimated by size exclusion chromatography. The compositions of these several pentosan-derived EPS were determined on their hydrolysates; and some preliminary data on their intrinsic viscosities was assembled. The relationships among EPS composition, substrate utilized, microbial growth phase, and molecular properties are exemplified.

2 citations


Patent
05 Oct 1990
TL;DR: In this paper, the poultry for feed additive includes a cellulase and a xylanase produced by means of selected strains of Humicola insolens and Trichoderma longibrachiatum.
Abstract: L'additif d'alimentation pour volailles comprend une cellulase ou une xylanase pouvant etre produites au moyen de souches selectionnees de Humicola insolens et de Trichoderma longibrachiatum. The poultry for feed additive includes a cellulase and a xylanase producible by means of selected strains of Humicola insolens and Trichoderma longibrachiatum. Grâce a cet additif, on peut soulager efficacement le syndrome de la mauvaise absorption. With this additive, it can effectively alleviate the malabsorption syndrome.

1 citations