It was also found that the unboiled cell free supernatant of B.
cenocepacia VBC7 and P. poae VBK1 are able to inhibit pathogenic
growth (Fig. 6D) whereas the boiled supernatants were not able to
produce any zones of inhibition which indicated the presence of
inhibitory principle in the supernatant but is heat labile. The antifungal
properties of these two bacteria against a number of plant
pathogenic fungi have already been studied in our laboratory
(Mukhopadhyay, 2010; Ghosh et al., 2011). These two strains are
also good phosphate solubilizer and can produce little amount of
indole acetic acid (Mukhopadhyay, 2010). Both the strains did
not produce any antagonism against the well known biopesticide
strain Trichoderma viride MTCC 793 and nitrogen fixing Rhizobium
leguminosarum MTCC 2379 (Mukhopadhyay, 2010). On the other
hand both boiled as well as unboiled cell free supernatants of lactic
acid bacteria were able to inhibit the fungal pathogen which indicated
the thermostable nature of their antifungal principles.