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    Drought stress imposed at different reproductive stages influences growth, yield and seed composition of soybean
    (University of the Philippines at Los Banos, 2008) Kirnak H.; Dogan E.; Alpaslan M.; Celik S.; Boydak E.; Copur O.
    Soybean (Glycine max L.) was grown in 2003 and 2004 to determine the effect of deficit irrigation given at five different reproductive stages on its growth, yield and seed composition. All soybean plots received full irrigation during the vegetative stage, while treatments were started during one of the reproductive stages (R1-2, beginning of flowering and full bloom; R3, beginning of pod; R4, full pod; R5, beginning of seed; R6, full seed and full irrigation) by completely stopping irrigation. In 2003 and 2004, the observed leaf area index ranged from 3.9 (R6) to 2.6 (control), and from 4.0 (R6) to 2.7 (control), respectively. Water stress resulted in reduced vegetative growth, leaf relative water content and leaf chlorophyll content. In 2003 and 2004 seed yields ranged from 1955 (R6) to 3684 kg ha1 (control), and from 1867 (R6)to 3952 kg ha-1 (control), respectively. Any water stress imposed on soybean plants in R3, R5 and R6 resulted in substantial yield reduction compared with the full irrigated control treatment. There were no significant effects of total chlorophyll and leaf relative water content on the oil and protein content of soybean seed. Water stress during the different reproductive stages (R 1-R6) significantly affected protein content, C18:0, C18:2 and C18:3 fatty acids. The lowest protein value was obtained in R 1-2, while the highest values were obtained from R4 in both years. Water stress effect imposed on any of the reproductive stages showed a significant effect on protein content but not seed oil. The highest protein content values were obtained from R4 treatment at 42.5% and 42.1 % in 2003 and 2004, respectively, while the lowest values were from R5 and R1-2 at 37.9% and 38.9% in 2003 and 2004, respectively. Average seed oil content in 2003 and 2004 were 14.61% and 16.12%, respectively.
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    Effect of varieties and years on seed composition of sesame (Sesamum indicum L.) grown in semi-arid area
    (Chemical Publishing Co., 2008) Boydak E.; Karabulut I.; Alpaslan M.; Hayta M.; Karaaslan D.
    The effect of variety and growing year on oil, protein and fatty acid composition of sesame seeds was studied. Five sesame cultivars, Muganli-57, Gölmarmara, Tan-99, Orhangazi-99, Kepsut-99 and pure lines 27224 and 27206 were investigated. The oil content of sesame samples varied from 38.65 to 51.79 %. The variety of Tan-99 grown in 2004 had the maximum oil value. Oil and protein content of sesame varieties grown in 2003 and 2004 years changed insignificantly (p > 0.05). The protein content of the variety of Orhangazi was the highest among other varieties. The correlation coefficient between protein and oil content was -0.372 averaged over 2003 and 2004. Oleic and linoleic acid contents were significantly affected by variety (p < 0.05). In 2003, all varieties had higher linoleic and lower oleic acid levels. The correlation coefficient V between oleic acid and linoleic acid content were -0.957 for sesame varieties grown in 2003 and 2004. In general, the variety appeared to have an influence on seed composition of sesame.