الفهرس 
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Abstract
The present study was carried out at the Rice Research and Training Center experimental Farm, Sakha, Kafr EL-Sheikh, Egypt during 2011 and 2012 rice growing seasons. Forty one rice (Oryza sativa L.),genotypes including Egyptian commercial varieties, promising lines and introduced varieties were used for evaluation under normal as well as drought conditions( irrigation every 12 days) during 2011 and 2012 rice growing seasons Molecular diversity among the 41 genotypes under study was carried out using 15 SSR markers. The best genotypes under water stress conditions were GZ 8450-19-6-5-3, GZ 8452-7-6-5-3, GZ 5121-5-2, Morobrekan, IET1444 and GZ 1368. These genotypes could be used as a donor parents in rice breeding program for improving drought tolerance traits to overcome the problem of water scarcity. The results of molecular diversity reflected the existence of considerable amounts of molecular diversity among the tested genotypes and hence demonstrate the feasibility of genetic improvement of drought tolerance using those genotypes in the breeding program.