الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
Cucumber (Cucumis sativus) one of the important summer crops of the Cucurbitaceae family, and it is believed that the Mediterranean basin is its original home. It is grown in order to obtain its fruits that are eaten Natural or for the purpose of pickling or salads of good nutritional value to contain a group of vitamins, namely (A, B and C). In addition to some nutrients, including Mn, S, Fe, P and Ca, which have an alkaline taste, cooled, cleansing blood, dissolving urinary acids and diuretic salts, and are used to treat freckles and melasma. Salinity is one of the most important abiotic environmental stress that negatively affect the growth and metabolism of plants due to its direct negative effects (toxicity and osmosis) on plants as well as the imbalance of nutrients and indirect effects on the chemical and physical properties of the soil. As the accumulation of salts in agricultural lands reduces the percentage of germination, plant growth and its inability to complete its life cycle, due to the negative role of the salts affecting various physiological processes in plants. There are some practices to mitigate the negative effects of salt stress, various mechanisms to protect the cells against the oxidative damage on cucumber plants. Foliar applications of salicylic acid, proline, or glycine betaine enhanced plant growth parameters under saline conditions and mitigated the adverse effects of NaCl salt on these parameters. Salicylic acid was the most effective in alleviating the negative effects of the salt stress followed by proline and by glycine betaine. These stimulating effects of salicylic acid could be related to its effects on the accumulation of total phenolic contents which concurred with the increase in plant growth promoters (auxins, gibberellins and cytokinins) which reflected in stimulating the plant growth that, which thus leads to an increase in plant growth and productivity under these conditions.