الفهرس 
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Abstract
This work aimed to investigate the expressions of resistance to ear rot disease (Fusarium moniliforme) among maize hybrids and screening them at field and tissue culture experiments. Two model systems were involved in this study for creating the novel disease resistant plants. The first model system was the traditional breeding program, where seven divergent inbred lines of white maize provided by the Maize Research Section, Field Crops Research Institute, ARC, Egypt, were crossed in diallel fashion without reciprocals and more selfed seeds were obtained by selfing each inbred line during 2007 and 2008 seasons.The parental lines and their diallel crosses along with the check cultivar T.W.C. 310 were evaluated under artificial infection with a spore suspension of Fusarium moniliforme for ear rot resistance. Earliness, physiological and biochemical traits as well as, yield and its attributes in 2009 season were also evaluated. The second model system was tissue culture technique which used as modern unconventional technique. The success of tissue culture for selecting the novel disease resistant plants hybrids, where callus of immature embryos of the maize lines and crosses were used to study the phytotoxic concentrations of Fusaric Acid. A series of FA concentration was used, with MS medium as follows: 0, 150, 300, 600 and 1200 μM/l FA in 2010 and 2011 seasons.The results indicated that the inbred lines P2 (L51), P1 (L122) and P5 (L84) expressed resistance to ear rot disease (Fusarium moniliforme) and their crosses, while other lines like P3 (L76) and P7 (L101) transmit the susceptibility in the first model system. It is interest to mention that, the inbred line P2 (L51) expressed tolerance to FA accumulation and may have the capacity to transmit tolerance to her crosses, while other lines like P3 (L76) and P7 (L101) transmit the susceptibility in the second model system.