الفهرس 
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Abstract
This study aimed to : A laboratory experiment was laid out at Giza Central Seed Testing Laboratory of Central Administration for Seed Certification (CASC), Ministry of Agriculture, Egypt, during the period of April to June 2014to study the response of some Soybean (Glycine max (L.) Merrill) cultivars to germination under salinity concentrations and to confirm the seedling growth performance to examine a range of genetic variability for salinity tolerance among Soybean cultivars. Treatments and Experimental Design : Treatments were arranged in factorial experiment in randomized complete block design with four replications.
The most important results obtained from the experiment can be summarized as follows : A. Cultivars performance : Results clearly showed a significant effect of studied Soybean cultivars on averages of final germination percentage (FGP), mean germination time (MGT), germination index (GI), seedling vigor index (SVI), Energy of Germination (EG), shoot and root length (cm), shoot and root fresh weight (mg), shoot and root dry weight (mg), relative dry weight (RDW %) and seedling height reduction (SHR %). B. Salinity concentrations effects 1 Results clearly showed that averages of final germination percentage (FGP), mean germination time (MGT), germination index (GI), seedling vigor index (SVI), energy of germination ( EG ), shoot and root length (cm), shoot and root fresh weight (g), shoot and root dry weight (g), seedling height reduction (%) and relative dry weight (%) significantly affected by salinity concentrations. C - Interaction effects : The interaction between cultivars and salinity levels significantly affected final germination percentage, mean germination time, energy of germination, root and shoot length, root and shoot fresh weight, shoot dry weight and relative dry weight. CONCLUSION : It could be concluded that for maximizing germination characters and seedling parameters under salinity stress it could be recommended sown Giza 22 and Giza 82 cultivars up to 6 dSm-1 NaCl. These cultivars were more tolerant to salinity and recommended to use in breeding program for enhancing soybean production in Egypt.