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Source and sink affect phytosterol concentration and composition of sunflower oil

AutorGonzález Belo, R.; Velasco Varo, Leonardo ; Nolasco, M. S.; Izquierdo, Natalia G.
Fecha de publicaciónjun-2016
Citación19th International Sunflower Conference (2016)
ResumenPhytosterols are oil compounds that help to reduce serum cholesterol. It is unknown if variations in source or sink during grain filling affect these compounds as in other quality traits (tocopherol concentration, fatty acid composition, etc.). The aim of this study was to evaluate the effect of variations in source or sink on phytosterols concentration and composition of the oil in sunflower genotypes with different fatty acid composition. Two field experiments were performed using a traditional, a high oleic (HO) and a high stearic-high oleic (HSHO) hybrid. At the beginning of grain filling treatments were applied to modify the source or sink: 75-80% leaf removal, 50% of grains removal and control. Oil phytosterols concentration and its composition were determined by GLC. In all hybrids, defoliation treatments increased phytosterols concentration in the oil, but reduced the content per grain, compared to the control. Removing grains increased the content of phytosterols per grain but it did not affect its oil concentration because oil per grain was also increased. The most abundant phytosterol was ß-sitosterol, followed by ?7-stigmastenol, campesterol, stigmasterol and ?7-avenasterol. Variations in source or sink only in few cases modified phytosterol composition. In both experiments, the HSHO hybrid had a higher proportion of campesterol and stigmasterol and lower of ß-sitosterol than traditional and HO. These results confirm that crop management is important not only for maximizing yield but also for obtaining a good oil quality.
DescripciónTrabajo presentado en la 19th International Sunflower Conference (ISC 2016), celebrada en Edirne (Turquía) del 29 de mayo al 3 de junio de 2016.
URIhttp://hdl.handle.net/10261/164902
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