Abstract
Tocopherols are a family of fat soluble antioxidants of great value for both nutritional and technological properties of seed oils. The four naturally occurring tocopherols (alpha-, beta-, gamma- and delta-tocopherol) widely differ for their relative in vivo (vitamin E) and in vitro antioxidant properties. Sunflower (Helianthus annuus L.) seeds mainly contain alpha-tocopherol (95% of the total tocopherols), which has a great vitamin E value but a low in vitro activity. Conversely, beta-tocopherol shows more balanced in vitro and in vivo antioxidant properties, which is desired for specific uses of the oil. The sunflower line T589 is characterised by an increased beta-tocopherol content in the seeds ( >30%), which is determined by the single gene Tph1. The objectives of this study were to map the Tph1 gene by molecular markers (SSRs) and to develop a linkage map of the Tph1-encompassing region. High performance liquid chromatography (HPLC) was used to phenotype 103 F2 and 67 F3 progeny from the mapping population CAS-12 × T589, which segregates for Tph1. Bulk segregant analysis identified two SSR markers on linkage group (LG) 1 linked to Tph1. A large linkage group was constructed by genotyping additional SSRs and INDEL markers. Tph1 mapped to the upper end of LG 1 and cosegregated with the SSR markers ORS1093, ORS222, and ORS598. The availability of tightly linked PCR-based markers and the location of the Tph1 gene on the sunflower genetic map will be useful for marker-assisted selection in sunflower and provides a basis for the physical mapping and positional cloning of this gene.
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Vera-Ruiz, E.M., Velasco, L., Leon, A.J. et al. Genetic Mapping of the Tph1 Gene Controlling Beta-tocopherol Accumulation in Sunflower Seeds. Mol Breeding 17, 291–296 (2006). https://doi.org/10.1007/s11032-005-5678-5
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DOI: https://doi.org/10.1007/s11032-005-5678-5