TY - JOUR
T1 - Biological control of Sclerotium rolfsii and Verticillium dahliae by Talaromyces flavus is mediated by different mechanisms
AU - Madi, Lea
AU - Katan, Talma
AU - Katan, Jaacov
AU - Henis, Yigal
PY - 1997/10
Y1 - 1997/10
N2 - Ten wild-type strains and two benomyl-resistant mutants of Talaromyces flavus were examined for theft ability to secrete the cell wall-degrading enzymes chitinase, β-1,3-glucanase, and cellulase, to parasitize sclerotia of Sclerotium rolfsii, to reduce bean stem rot caused by S. rolfsii, and to secrete antifungal substance(s) active against Verticillium dahliae. The benomyl-resistant mutant Ben(R)TFI-R6 overproduced extracellular enzymes and exhibited enhanced antagonistic activity against S. rolfsii and V. dahliae compared to the wild-type strains and other mutants. Correlation analyses between the extracellular enzymatic activities of different isolates of T. flavus and their ability to antagonize S. rolfsii indicated that mycoparasitism by T. flavus and biological control of S. rolfsii were related to the chitinase activity of T flavus. On the other hand, production of antifungal compounds and glucose-oxidase activity may play a role in antagonism of V. dahliae by retardation of germination and hyphal growth and melanization of newly formed microsclerotia.
AB - Ten wild-type strains and two benomyl-resistant mutants of Talaromyces flavus were examined for theft ability to secrete the cell wall-degrading enzymes chitinase, β-1,3-glucanase, and cellulase, to parasitize sclerotia of Sclerotium rolfsii, to reduce bean stem rot caused by S. rolfsii, and to secrete antifungal substance(s) active against Verticillium dahliae. The benomyl-resistant mutant Ben(R)TFI-R6 overproduced extracellular enzymes and exhibited enhanced antagonistic activity against S. rolfsii and V. dahliae compared to the wild-type strains and other mutants. Correlation analyses between the extracellular enzymatic activities of different isolates of T. flavus and their ability to antagonize S. rolfsii indicated that mycoparasitism by T. flavus and biological control of S. rolfsii were related to the chitinase activity of T flavus. On the other hand, production of antifungal compounds and glucose-oxidase activity may play a role in antagonism of V. dahliae by retardation of germination and hyphal growth and melanization of newly formed microsclerotia.
KW - Antibiosis
UR - http://www.scopus.com/inward/record.url?scp=0030772021&partnerID=8YFLogxK
U2 - 10.1094/PHYTO.1997.87.10.1054
DO - 10.1094/PHYTO.1997.87.10.1054
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AN - SCOPUS:0030772021
SN - 0031-949X
VL - 87
SP - 1054
EP - 1060
JO - Phytopathology
JF - Phytopathology
IS - 10
ER -
