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Do Pathogenic Fungi Have the Potential to Inhibit Biocontrol Fungi?
Author(s) -
Lewis J. A.,
Lumsden R. D.
Publication year - 1995
Publication title -
journal of phytopathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 60
eISSN - 1439-0434
pISSN - 0931-1785
DOI - 10.1111/j.1439-0434.1995.tb00205.x
Subject(s) - biology , potato dextrose agar , mycelium , conidium , agar , pythium ultimum , rhizoctonia solani , botrytis cinerea , microbiology and biotechnology , germination , food science , botany , bacteria , genetics
Metabolites produced by the soilborne plant pathogen Rhizoctonia solani (R‐23) and Pythium ultimum (PuZ3) grown on cellophane disks placed on potato‐dextrose agar (PDA), molasses brewer's yeast agar (MYA) and wheat bran extract agar (BEA) did not significantly affect the rate of growth of isolates of the antagonists Trichoderma viride (TS‐I‐R3. Tv‐101), T. harzianum (Th‐57, Th‐87), T. hamatum (Tm‐23, TRI‐4), or Gliocladiun virens (GI‐3, GI‐21) when these antagonists were grown on the three agars containing pathogen metabolites. However. in some instances. density of antagonist mycelium growing on the agar media as well as the observable production of antagonist conidia on the agar media were reduced. Using four antagonists in liquid cultures of potato‐dextrose broth (PDB) containing metabolites of the pathogens grown on bran extract broth, metabolites from R‐23 significantly reduced mycelial dry weight of Th‐87 and GI‐21 but not that of TRI‐4 and GI‐3. On the contrary. metabolites of PuZ3 increased the mycelial dry weight of all four antagonists, Metabolites of R‐23 reduced production of conidia of only TRI‐4; metabolites of PuZ3 significantly reduced production of conidia of all four antagonists. Pathogen metabolites did not affect germination of conidia in the system used.