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Relationship between in vitro cellulase production of uv-induced mutants of Trichoderma harzianum and their bean rhizosphere competence

Published online by Cambridge University Press:  01 November 1997

I. S. MELO ,
J. L. FAULL  and
K. A. GRAEME-COOK
I. S. MELO
Affiliation:
CNPMA/EMBRAPA, Cx Postal 69, 13820-000, Jaguarina, Sao Paulo, Brazil
J. L. FAULL
Affiliation:
Biology Department, Birkbeck College, University of London, Malet Street, London WC1E 7HX, U.K.
K. A. GRAEME-COOK
Affiliation:
Biology Department, Birkbeck College, University of London, Malet Street, London WC1E 7HX, U.K.
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Abstract

Strains of Trichoderma harzianum with either elevated or reduced production of cellulase-complex enzymes β-glucosidase and endoglucanase were constructed using uv-light mutagenesis. In tests for rhizosphere competence two of the cellulase minus strains were found to have significantly enhanced rhizosphere competence, whilst two cellulase overproducers were found not to colonize either the rhizosphere or rhizoplane of bean plants. These results indicate that rhizosphere competence of Trichoderma strains is not always associated with extracellular enzyme production.

Type
Research Article
Information
Mycological Research , Volume 101 , Issue 11 , November 1997 , pp. 1389 - 1392
Copyright
The British Mycological Society 1997

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