الفهرس 
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Abstract
These experiments were conducted at the experimental farm of the Rice Research and Training Center (RRTC), Sakha, Kafr EL-Sheikh, Egypt and molecular biology Lab Gifu University, Japan. Gene expression was analyzed by Real-time Quantitative RT-PCR Analysis (qRT-PCR) . The tolerant cultivar Morebreken had higher dry weight, RWC, Fv/Fm, APX activity, sugars and proline content than drought sensitive cultivar Giza 177 under drought stress at the seedling stage, suggesting that Morebreken cultivars resisted the damage caused by the induced drought stress more effectively. The drought tolerant cultivar have a greater capacity to modulate higher gene expression in comparison to the drought sensitive cultivar.