Sunflower is one of the most widely cultivated oil crops. It produces seeds which have abundant health benefits. The
objective
of this research was to determine the effects of two growing years and five planting dates on agronomic traits and chemical compositions in sunflower accessions. In this study, genotype by year interaction was significant for days to flowering, weight of seeds per plant, oil, palmitic acid, stearic acid, oleic acid, linoleic acid, all tocopherol and phytosterol components. The major source of variation in most agronomic traits and chemical compositions in sunflower was attributed by variation among genotypes. Days to flowering, head length, and weight of seeds per plant decreased when planting date was delayed. Oil content, stearic acid, oleic acid, α-tocopherol, total tocopherol, β-sitosterol, and total sterol contents decreased but linoleic acid increased when planting date was delayed. From this study, valuable information will be provided for sunflower breeders and growers in developing and producing functional food resources and products.
Citations
Rapeseeds have many health benefits because its oil is rich in polyunsaturated and monounsaturated fatty acids, tocopherols and phytosterols. The
objective
of this research was to examine a possible genetic variation of oil, fatty acids, tocopherols and phytosterols in eight rapeseed varieties and the effect of locations on expression of those chemical compounds. In this study, effects of variety x location interaction for palmitic, stearic, oleic, linoleic, linolenic, eicogenic and erucic contents were found to be significant while that of oil content was not. For oil content, variation between the two locations was much higher than all other factors. Variation among varieties was the major source of variation in most fatty acids. Variation between two locations was much less for tocopherols and phytosterols than that for oil and fatty acids. Instead, variation in residual effect was much higher in tocopherols and phytosterols demanding more number of replication to achieve same level of statistical precision as oil and fatty acids. Correlation analyses confirmed that some of the chemical compounds can be a target for indirect selection.
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