الفهرس 
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Abstract
The experimental work of this investigation was carried out at Sakha, Mallawy and Nubaria Agricultural Research Stations, Agricultural Research Center, Egypt during the two successive seasons 2011 and 2012. The materials used in this study were nine white inbred lines of diverse genetic geographic origin. All possible cross combination, without reciprocals were made among nine inbred lines producing 36 single crosses at Sakha Research station in 2011.
Two types of experiments were done in this study. The first(yield experiments) was to study yield and its attributes and the second(disease experiment) was to study resistance to leaf blight. The data was taken on grain yield (kg/plot) adjusted to (ard/ fed.)., silking date, plant and ear height (cm), ear length (cm), ear diameter (cm), number of rows/ear, number of kernels/row and 100_kernel weight (g). The same 36 F1 crosses and nine parental inbred lines were evaluated under artificial infection by leaf blight disease at two locations; Sakha and Nubaria stations in 2012 season. The randomized complete block design with four replications was used. The available data of parents and F1 crosses were analyzed according to Griffing (1956) method 2, model 1. The obtained results could be summarized as follow:-
All studied traits were affected significantly by locations except for ear diameter and number of rows/ear. Variance of genotypes for all studied traits was significant. Also, the interaction between genotypes and their partitions with locations was significant in most traits. The results cleared that the variance of general combining ability (GCA) was significant for all studied traits while the variance of (SCA) was significant for days to 50% silking, ear length, number of kernels/row and 100-kernel weight.
The interaction between GCA and SCA with location was significant for most traits. The additive gene action was more important than non-additive gene action in the all studied traits except for number of kernels/row. Also, the results showed that the additive gene action was more interacted with locations than non-additive gene action in the all traits except for ear diameter while non-additive gene action was interacted with locations for plant height and ear height.