A significantly higher (p<0.01) level of peroxidase activity was observed in leaf sample of sesame treated withantagonistic T. harzianum and the pathogen Alternaria sesami compared with the control. Maximum induction of POXactivity was observed after T. harzianum treatment at 72h of pathogen inoculation (30.9±1.4 and 51.3±0.12 U/g freshweight in Thilarani and wild sesame). The enzyme activity was significantly increased upto 72h from the period ofinoculation and then it declined gradually whereas minimum peroxidase activity recorded in control treatments (Table3). Peroxidase convert H2O2 to water provides an efficient system to prevent oxidative damage. Induction andaccumulation of POX correlated with the onset of induced resistance suggest an active role for this enzyme in defenseagainst pathogenic fungi and retard fungal growth (Jung et.al., 2004).Bio formulation of T. virens sprayed on cucumberleaves and flowers increased the induction of peroxidase activity (Wei et.al., 1996).Nandakumar et.al. (2001) reported that two peroxidase isoforms have been induced in plant growth promoting rhizobacteria treated rice plants inoculated with sheath blight pathogen R. solani. Emeran et. al. (2006) reported a positivecorrelation between peroxidase enzyme and resistance developed in plants. Peroxidase activity also enhanceslignification in host plants which may indirectly restrict fungal penetration.
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