Thesis (Ph.D.) - Cairo University - Faculty of Agriculture - Department of Nematology

This study was carried out to compare the changes in chemical contents, enzymatic and non enzymatic oxidants and antioxidants involved in defense mechanisms in different plants in response with M. incognita, R. reniformis or T. semipenetrans; as well as to enhance the acquired resistance of plants using different materials. Data showed that eggplant and papaya were more susceptible to M. incognita; however cowpea and jasmine were more favorable to R. reniformis. In all cases there were significant variations in nematode counts and growth criteria between the two inoculum levels (2000, 4000). Results of screening for nematode resistance induction by some organic and inorganic fertilizers, commercial products and plant growth regulators indicated that organic were better than inorganic fertilizers in reducing all the root-knot nematode counts on eggplant with superiority to compost followed by neem dry leaves. Hyper K ® and union zinc® were the best inorganic fertilizers. Indole acetic acid and indole butyric acid preceded all the tested matrials in enhancing the resistance of eggplant against the root-knot nematode followed by ascorbic acid, amino zinc and citric acid. Only indole acetic acid, compost and indole butyric acid, in that order, brought the levels of MDA in infected roots to be near to that of the healthy plants without significant differences. Almost similar results were obtained with the reniform and the citrus nematodes infecting cowpea and sour orange, respectively

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