الفهرس 
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Abstract
This study was carried out at the Agronomy Department, Faculty of Agriculture, Kafr El-Sheikh University and the Rice Research and Training Center (RRTC), Sakha, Kafr EL-Sheikh during 2013, 2014 and 2015 seasons. The study included two main experiments at two locations, i.e., the first (normal and water shortage stress) experiment was conducted at Sakha Agricultural Research Station, Kafr EL-Sheikh Governorate and the second (heat stress) experiment was conducted at New Valley Agricultural Research Station, New Valley Governorate, Egypt. The six populations; P1, P2, F1, F2, BC1 and BC2 of each of the three studied crosses were evaluated under normal, drought and heat stress conditions using randomized complete block design with three replications. The results indicated the presence of non-allelic interaction for all studied traits in all crosses. In addition, several types of gene action were significant in all crosses for all studied traits but the additive gene action played the major role for some studied traits. While, dominant gene action played the major role for the inheritance for some studied traits. Due to the importance of additive and non-additive gene action in the genetic expression of the studied traits, it could be suggested that the recurrent selection breeding program is the proper way to improve these traits under drought and heat stress conditions. Finally, it is possible to select for drought and heat stress improve new cultivars appropriate for cultivation in such stress environments.