A key biocontrol mechanism for most Trichoderma strains
is mycoparasitism mediated by production of chitinases
and other cell-wall-degrading enzymes (Chet, 1987; Lorito
et al., 1996). We assessed the transcription of some genes
encoding chitinolytic enzymes that have been associated
with mycoparasitism-related growth conditions at various
stages of plate confrontation assays with F. culmorum and
F. graminearum. Our results showed a clear upregulation of