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Root-knot nematodes (Meloidogyne spp.) are the most economically important group of plant parasitic nematodes on manycrops worldwide. Resistance-based management is considered as one of the most sound and effective strategies against these pathogens.Plant-mediated systemic resistance against the M. javanica in tomato cv. CALJN3 was triggered using salicylic acid (SA) andPseudomonas fluorescens CHAO as elicitors. The effect of each elicitor was assayed by (1) the calculation of nematode indices includingthe number of nematode galls, egg masses and eggs/egg mass; (2) the analysis of changes in the concentration of reactive oxygenspecies (ROS); and (3) monitoring the activities of their scavenging enzymes viz. superoxide dismutase (SOD), peroxidase (POX), andcatalase (CAT). The results indicated that SA/bacterial elicitors induced the removal of high concentrations of the toxic ROS via anincrease in the activity of their scavenging antioxidant enzymes, especially that of catalase. Moreover, pre- or post-treatment applicationof the elicitors significantly reduced the number of galls, egg masses or eggs of M. javanica in infected tomato plants as comparedto the control. The results of the present study support the involvement of the elicitor-induced ROS and related scavenging enzymesfor stimulating plant defense reactions in a moderately resistant tomato challenged with M. javanica

journal of plant protection research

Induction of systemic resistance and defense-related enzymes in tomato plants using Pseudomonas fluorescens CHAO and salicylic acid against root-knot nematode Meloidogyne javanica