الفهرس 
AcknowledgementOnly 14 pages are availabe for public view
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Abstract
The present study aimed to evaluate the genetic diversity among some genotypes that belong to different rice types, using different tools of genetic diversity assessment. Subsequently, to determine the suitable breeding programme for improvement the important studied traits. For this purposes, 72 rice genotypes belong to species (Oryza sativa L.) were investigated. These genotypes represent three different types of rice, which were collected from the Genetic Stock of Rice Research and Training Center (RRTC), Sakha, Kafr El-Sheikh, Egypt. These types were including Temperate Japonica, Indica and Tropical Japonica. Each one of these types contained 24 rice genotypes. Two kinds of evaluation were used; the first one was field experiment in order to evaluate some quantitative & qualitative agronomic traits at the Research Farm of Rice Research and Training Center (RRTC) during the two successive growing seasons 2014 and 2015.While, the second was molecular assessment at Laboratories of Genetics Department, Faculty of Agriculture, Kafr El-Sheikh University. Finally in conclusion, from all the previous results it could be concluded that, the presence of genetic difference between the studied genotypes with respect all studied traits and these genotypes are stable in their behaviour with different environmental conditions with respect to most of studied traits. In addition, high heritability coupled with high genetic advance was observed for most of studied traits, suggesting the effectiveness of selection in early generation to improve these traits. Furthermore, due to most of morphological traits are strongly associated with molecular markers (ISJ), it could be use the simple morphological traits as marker for selection in the early generation during the applied breeding programme. In addition, molecular markers have the potential to detect genetic diversity and to aid the management of plant genetic resources.