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Trichoderma harzianum
About: Trichoderma harzianum is a research topic. Over the lifetime, 4731 publications have been published within this topic receiving 96796 citations.
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TL;DR: Two strains with known biocontrol capabilities were found to relate to the genotypic group containing Th1 and Th2 forms and, based on variation within this group, to belong to a homogeneous group of form Th1 strains.
61 citations
TL;DR: Trichorzins HA and MA, original 18-residue peptides, were isolated from two strains of the widespread soil fungus Trichoderma harzianum which have been shown to exhibit antibiotic activity against phytopathogenic fungi and structure-activity relationships were deduced from the antibiotic and membrane-modifying properties.
Abstract: Trichorzins HA and MA, original 18-residue peptides, were isolated from two strains of the widespread soil fungus Trichoderma harzianum which have been shown to exhibit antibiotic activity against phytopathogenic fungi. These linear peptides belonging to the peptaibol class are biosynthesized as a complex of closely related analogues. Nine major pure peptides, six trichorzins HA and three trichorzins MA, were isolated by reversed-phase HPLC. The isolated peptides exhibited antibacterial activity against S. aureus and increased the membrane permeability of egg phosphatidylcholine/cholesterol (7/3) liposomes, as measured by monitoring leakage kinetics of a fluorescent probe. Structure-activity relationships were deduced from the antibiotic and membrane-modifying properties.
61 citations
TL;DR: The data suggest that the plasma membrane may be the primary target of chitosan action, and that the two fungi differ in the extent to which they are affected.
61 citations
TL;DR: Two isolates significantly reduced the Foxy incidence and enhanced seed germination, though less effective than the fungicide mixture (carboxin + thiram) and a principal component analysis indicated the importance of volatile metabolites in reducingFoxy incidence on common bean seeds.
Abstract: Biological control of seed-borne pathogens has shown to enhance germination and physiological quality of seeds. The objectives of this study were to evaluate the in vitro antagonistic effect of five Trichoderma harzianum isolates (CEN287, CEN288, CEN289, CEN290, and CEN316) against Fusarium oxysporum f. sp. phaseoli (Foxy) and test its potential use in seed treatment. Initially, pathogen and antagonists were grown in paired cultures at 25oC, from which samples were assessed using scanning electron microscopy (SEM). Then, clean or Foxy-infected seeds were treated with conidial suspension of the antagonists. Percent of Foxy-infected seeds and normal seedlings were evaluated at seven and nine days of incubation, respectively. All but one Trichoderma isolate (CEN290) inhibited Foxy mycelial growth. SEM analysis revealed that only one Trichoderma isolate (CEN287) showed parasitic interaction with Foxy. Two isolates (CEN287 and CEN316) significantly reduced the Foxy incidence and enhanced seed germination, though less effective than the fungicide mixture (carboxin + thiram). A principal component analysis indicated the importance of volatile metabolites in reducing Foxy incidence on common bean seeds. CEN287 Trichoderma harzianum isolate formed a single group due to its increase in germination rate of Foxyinfected seeds.
61 citations
01 Jan 2008
TL;DR: A study to control Colletotrichum dematium causing anthracnose of soybean with fungicides, plant extracts and Trichoderma harzianum found that garlic extract at 20% concentration was appeared to be best in inhibiting the radial growth and mycelial dry weight of the test pathogen followed by onion, ginger and neem extracts.
Abstract: Shovan L.R., Bhuiyan M. K. A., Begum J. A. and Pervez Z. 2008. In vitro Control of Colletotrichum dematium Causing Anthracnose of Soybean by Fungicides, Plant Extracts and Trichoderma harzianum. Int. J. Sustain. Crop Prod. 3(3):10-17 A study was conducted in the Microbiology Laboratory of Plant Pathology Department, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, during 2005 to 2006 to control Colletotrichum dematium causing anthracnose of soybean with fungicides, plant extracts and Trichoderma harzianum. Five fungicides namely Tilt-250 EC, Vitavax-200, Rovral 50 WP, Dithane M-45 and Cupravit were evaluated at 100, 200 and 400 ppm for their efficacy against the radial colony growth and mycelial dry weight of C. dematium. The complete inhibition was obtained with Tilt-250 EC at all the selected concentrations. The highest concentration of Vitavax-200 inhibits 77.41% and 83.45% radial growth and mycelial dry weight, respectively and significantly superior to Rovral 50 WP at the highest concentration. Dithane M-45 and Cupravit were found to be significantly inferior against the test pathogen. Plant extracts of garlic, ginger, onion and neem at three different concentrations (5%, 10% and 20%) were evaluated against the radial growth and mycelial dry weight of C. dematium. Among the four plant extracts, garlic extract at 20% concentration was appeared to be best in inhibiting the radial growth and mycelial dry weight of the test pathogen followed by onion, ginger and neem extracts and each extracts were significantly different from each other. A total of 20 T. harzianum isolates collected from rhizosphere and rhizoplane of different crops were screened against C. dematium following dual plate culture technique. The screened isolates of Trichoderma showed significantly variable antagonism ranging from 50.93 to 89.44% reduction of the radial growth of C. dematium. Among the promising antagonists, the isolate T3 of T. harzinum showed the highest 89.44 % inhibition of radial growth of C. dematium.
61 citations