Abstract:
Water potential and pM arc probably the most important environmental
parameters affecting the activities of mycoparasitic T. asperellum TNJ63. Therefore it is
impoilant to collect information on the effects of these factors on mycelial growth of
T. asperellum TNJ63 with biocontrol potential. The highest mycelial growth was
observed at pH 5,0 in both cellulose and chitinase media. The lowest mycelial growth
was observed at pH 8.5 in both cellulose and chitinase media Nearly linear correlation
was found between water potential and colony growth diameter with higher growth
diameter and higher potential water. Optimal water potential values are suggested to be at
-1 MPa for both media. The lowest mycelial growth was observed at -11 MPa in both
media The mycelial growth depended on the water potential value and not on the quality
of salt (NaCl or KCl) used as osmoticum. These results suggest the possibility of using
this sn-ain for biocontrol purposes in soil with lower pH and lower water potential.
