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Screening of antimicrobial activities in Trichoderma isolates representing three Trichoderma sections

Published online by Cambridge University Press:  10 November 2005

Juan A. VIZCAÍNO ,
Luis SANZ ,
Angela BASILIO ,
Francisca VICENTE ,
Santiago GUTIÉRREZ ,
M. Rosa HERMOSA  and
Enrique MONTE
Juan A. VIZCAÍNO
Affiliation:
Spanish-Portuguese Center of Agricultural Research (CIALE), Department of Microbiology and Genetics, University of Salamanca, Edificio Departamental lab 208, Plaza Doctores de la Reina s/n, ES-37007 Salamanca, Spain. E-mail: emv@usal.es
Luis SANZ
Affiliation:
Spanish-Portuguese Center of Agricultural Research (CIALE), Department of Microbiology and Genetics, University of Salamanca, Edificio Departamental lab 208, Plaza Doctores de la Reina s/n, ES-37007 Salamanca, Spain. E-mail: emv@usal.es
Angela BASILIO
Affiliation:
Center for Basic Research, Merck, Sharp & Dohme de España S. A., Calle Josefa Valcárcel 38, ES-28027 Madrid, Spain.
Francisca VICENTE
Affiliation:
Center for Basic Research, Merck, Sharp & Dohme de España S. A., Calle Josefa Valcárcel 38, ES-28027 Madrid, Spain.
Santiago GUTIÉRREZ
Affiliation:
University of León, Campus of Ponferrada, Superior and Technical Universitary School of Agricultural Engineers, Area of Microbiology, Avda. Astorga s/n, ES 24400 Ponferrada, Spain.
M. Rosa HERMOSA
Affiliation:
Spanish-Portuguese Center of Agricultural Research (CIALE), Department of Microbiology and Genetics, University of Salamanca, Edificio Departamental lab 208, Plaza Doctores de la Reina s/n, ES-37007 Salamanca, Spain. E-mail: emv@usal.es
Enrique MONTE
Affiliation:
Spanish-Portuguese Center of Agricultural Research (CIALE), Department of Microbiology and Genetics, University of Salamanca, Edificio Departamental lab 208, Plaza Doctores de la Reina s/n, ES-37007 Salamanca, Spain. E-mail: emv@usal.es
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Abstract

Methanol extracts from 24 Trichoderma isolates, selected as biocontrol agents and representating different species and genotypes from three of the four taxonomic sections of this genus (T. sect. Trichoderma, T. sect. Pachybasium and T. sect. Longibrachiatum) were screened for antibacterial, anti-yeast and antifungal activities against a panel of seven bacteria, seven yeasts and six filamentous fungi previously used in similar studies. Two different growth media were tested (potato dextrose broth and CYS80), and all isolates included in the antimicrobial tests showed at least one inhibitory activity against one of the target microorganisms in one of the two culture media. No statistically significant differences were detected in the number of active strains between the two culture media, but the highest number of inhibitory strains against bacteria and fungi were found in strains from Trichoderma sect. Pachybasium, whereas strains from T. sect. Longibrachiatum showed the highest anti-yeast values. In all cases, a correlation was found between the strains that were active against yeasts and fungi. However, some degree of variability was detected for strains within the same taxonomic section. In general terms, strains from T. asperellum (mainly in CYS80 medium), and T. longibrachiatum gave the best non-enzymatic antimicrobial profiles.

Type
Research Article
Information
Mycological Research , Volume 109 , Issue 12 , December 2005 , pp. 1397 - 1406
Copyright
The British Mycological Society 2005

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