الفهرس 
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Abstract
The aim objectives of the present work were to study:
(a)-Antagonistic effect of PGPR strains against R. solani and F. solani.
(b)-Effect of inoculation with PGPR as biofertilizer on some enzymes activity and certain plant growth parameters.
(c)-Effects of some natural plant extracts and certain antioxidants on incidence and defensive enzymes against root rot disease in tomato under greenhouse conditions.
CONCLUSION
In the present study it could be concluded that the inoculation by of tomato plants with PGPR improve the rate of respiration and total microbial activities (DHA), increase the availability phosphorus (Phosphatase) and accelerate N2 fixation (N2-ase). These bacteria are capable of stimulating physical, chemical and biological changes in plants, resulting both directly and indirectly in induced biotic and abiotic stress tolerance through a wide range of mechanisms. The use of PGPR as a key element of the agricultural system is a technology that has come to stay and the use of these techniques are already being embraced in many developed countries. In advanced countries, where the cost of artificial chemicals is relatively high, the utilization of PGPR holds a major role in the development of nonchemical agriculture systems.