It is obvious from our results (Figures 4 to 11) that the
treatments with T. harzianum caused smaller and
irregular lignification in vessel elements of the xylem in
the transverse sections of the leaves of maize plants as
compared to the control. This reduction in the amount of
liginin was much more pronounced by using 100 µl of the
culture supernatant of T. harzianum since the walls of
xylem vessel elements were thinner than those in the
control; this result confirm that such treatment caused the
highest morphological growth.