الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
In vitro experiments were performed to determine responses of wheat calli to ascorbic acid (AsA) concentrations (0, 250, 500, 1000 and 2000 ppm) under different levels of sea water (0, 15, 30 and 45%) and to determine suitable concentrations of AsA for exogenous treatments to enhance wheat tolerance to salinity. Results of this study indicated that AsA of (500, 1000 and 2000 ppm) concentrations improved tolerance of wheat calli to salinity. Two pot experiments were conducted during the two successive seasons 2004-2005 and 2005-2006 to determine the effect of exogenous AsA of 0, 500, 1000 and 2000 ppm concentrations at 45 and 75 days after sowing on growth, chemical composition and yield of wheat plants cv. Giza 168 (salt sensitive) irrigated with different levels of sea water (0, 15, 30 and 45%) in comparison with plants of cv. Sids 1 (partially salt-tolerant). The obtained results in this study clearly revealed that exogenous AsA enhanced plant growth, chemical composition and consequently the productivity of wheat plants under salinity stress conditions. These effects may be attributed to the protective role of AsA in plant cells from the oxidative stress induced by salinity. It could be concluded that exogenous AsA of 1000 ppm concentration at 45 and 75 days after sowing is the most effective treatment to increase wheat tolerance to salinity.
Key words: Wheat, salinity, ascorbic acid, in vitro, calli.Conducted laboratory experiments to determine the response Cales wheat Giza 168 (salt-sensitive variety) to add a different concentrations of acid Alascorbak (0, 250, 500, 1000 and 2000 ppm) for the environment nutrients under different levels of salinity.
The obtained results proved the role of acid Alascorbak increase carrying wheat plants to salt stress.
where the results showed a significant increase in dry weight, yield and chemical analysis results confirmed that acid treatment Alascorbak may have improved the chemical composition of plants, treatment plants Mquaonp Control Unit, under the same salinity levels.