(Fig. 3A), followed by vh6 and vh22 in comparison to control (Fig. 3B).
HPLC analysis of tomato leaves following treatment of plantswith the
six biocontrol agents and challenging with R. solani revealed differential
expression of phenolic compounds. Of these, six peaks of
phenolic acids could be identified as gallic (Rt. 2.56 min), gentisic
(3.47), chlorogenic (3.56), ferulic (4.07), salicylic (6.68) and cinnamic
(9.81) acids. The highest accumulation of gallic acid (29.02 mg g1
fresh leaf wt)was detectedin treatment with vh8 at 48 h as compared
to non-treated control (2.21 mg g1 fresh wt)(Table 1). The pattern
was observed to be consistent in all treatments up to 8 days after
treatment with gradual decrease in quantity.