Plate confrontation assay of T.
harzianum and B. cinerea, and SDS/PAGE of
cell-free extracts of mycelia collected during different stages of
mycoparasitism. (A) Schematic description of the plate assay
used to prepare cell-free extracts from different stages of
mycoparasitism. Small circles represent T. harzianum (T)
or B. cinerea (B) colonies growing on agar medium in a
Petri plate (large circles). The mycelium was collected from the
pattern-filled zones before the contact (a1), and 12 h (a2),
24 h (a3), and 72 h (a4) after the contact. Samples were also
collected from other conditions (see Materials and
Methods). (B) SDS/PAGE of T.
harzianum cell-free extracts from different conditions. Lanes:
1, extract from a T. harzianum–T. harzianum interaction
12–24 h after the contact; 2, T. harzianum extract from
mycelium in stage a1; and 3–5, T. harzianum extracts of
mycelia from stages a2, a3, and a4, respectively. Twenty micrograms of
protein was applied per slot.