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Colony growth, in vitro antagonism and secretion of extracellular enzymes in cold-tolerant strains of Trichoderma species

Published online by Cambridge University Press:  01 May 2000

Zs. ANTAL ,
L. MANCZINGER ,
Gy. SZAKACS ,
R. P. TENGERDY  and
L. FERENCZY
Zs. ANTAL
Affiliation:
Research Group for Microbiology, Hungarian Academy of Sciences and Attila József University, Szeged, Hungary.
L. MANCZINGER
Affiliation:
Department of Microbiology, Attila József University, Szeged, Hungary.
Gy. SZAKACS
Affiliation:
Department of Agricultural Chemical Technology, Technical University of Budapest, Hungary.
R. P. TENGERDY
Affiliation:
Department of Microbiology, Colorado State University, Fort Collins, CO, USA.
L. FERENCZY
Affiliation:
Research Group for Microbiology, Hungarian Academy of Sciences and Attila József University, Szeged, Hungary. Department of Microbiology, Attila József University, Szeged, Hungary.
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Abstract

Of three hundred and sixty Trichoderma strains investigated, fourteen, identified as T. aureoviride, T. harzianum and T. viride, grew well at 5 °C on both minimal and yeast extract agar media. In dual culture tests at 10°, most strains antagonized the phytopathogens Rhizoctonia solani and Fusarium oxysporum f. sp. dianthi. T. aureoviride and T. viride were more effective against Pythium debaryanum than T. harzianum. The activities of extracellular chitinases (EC 3.2.1.30), β-glucosidases (EC 3.2.1.21) and proteases (EC 3.4.21.1; EC 3.4.21.4), which are thought to be involved in the mycoparasitic process, were also examined and results showed that these enzymes were highly active at 5° in the cold-tolerant strains.

Type
Research Article
Information
Mycological Research , Volume 104 , Issue 5 , May 2000 , pp. 545 - 549
Copyright
© The British Mycological Society 2000

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