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Abstract
This study was carried out to evaluate some biotic and abiotic agents as inducers for tomato resistance against the root-knot nematode, Meloidogyne incognita. These agents included rhizobacteria, chemical activators and also some growth regulators. Results showed that thirty five bacterial isolated processed the ability to kill nematode juveniles (J2) with various degrees. Serial screenings were done till selecting ten species defined as; Bacillus brevis, B. cereus, B. firmus, Klebsiella planticolla, Lactobacillus agilis, L. fermentum, Methylomonas methanica, Neisseria elongate, Obesumbacterium proteus and Pseudomonas aeruginosa, which achieved highly reduction% (R) in nematode build-up. The more effective four species were M. methanica, B. cereus, O. proteus and B.brevis while they recorded 93.20%, 89.25%, 87.66% and 87.74% (R) in total population. The ten species showed nematicidal activity against nematode (J2) and also inhibited egg hatch. These species were able to suppress nematode population and improving tomato plant growth. Split-root technique indicated that these species could suppress nematode via induction of systemic resistance (ISR), also elevation of peroxidase (POX) and polyphenol oxidase (PPO) activities as well as total phenolic content in tomato roots presented other indicators for occurring ISR. On such four vigorous species, the most effective bacterial form was crude suspension (cells&metabolites), also the ability of dead cell to suppress nematode population proved capability of these bacteria to ISR