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  In order to investigate the Fatty Acids Composition and some chemical Characteristics in four sunflower hybrids, under three irrigation regimes (irrigation after 50, 100 and 150 mm cumulative evaporation from class A evaporation pan, respectively) an experiment design As a split plot design based on a randomized complete block was conducted at the research field of university of Tehran, college of Abouraihan in Pakdasht, Iran. The results showed that increasing of water deficit stress causes considerable reduced in the amount of oil seed and increased in seed protein, so the highest seed oil and seed protein content obtain in optimum and mild stress conditions respectively. Also the most of seed oil and seed protein contain was obtained by Azargol and Hayes 25 respectively. Investigation on fatty acids compositions in sunflower hybrids seeds indicated that highest fatty acid, palmitic (6.16%) and stearic (4.16%) were obtained in intense water deficit stress and oleic (40.25%) and linoleic (51%) were obtained in mild water deficit stress, respectively. Comparison between sunflower hybrids showed that maximum palmitik, stearic, oleic and linoleic were obtained by Allstar (7%), Hysun 33 (4.20%), Hayes 33 (42.77%) and Allstar (52.66%) respectively. Also in terms of optimum irrigation, mild water deficit stress and intense water deficit stress conditions Hysun 33 was successful to produced maximum Oleic acid. Generally based on the results of this study in optimum and mild water deficit stress conditions Allstar hybrids and in intense water deficit condition Hayes 25 hybrids had met the highest linoleic acid.

Keywords: Sunflower seed, Fatty acid compositions, Chemical characteristics, water deficit stress

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