ReviewTAG. Theoretical and applied genetics. Theoretische und angewandte Genetik2025
Survey of tocopherol and the associated genetic loci in wheat grain.
Review in TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
key messageSurvey of tocopherol and identification of genetic loci in wheat grain: toward a better understanding for breeding tocopherol cultivars. Tocopherol is essential in maintaining human sex hormone as well as antioxidation and immune functions. In this study, the contents of α-, γ- and δ-tocopherol in a Chinese wheat mini-core collection were measured with high-performance liquid chromatography. The effects of various factors such as accession types, winter/spring types and grain colors on tocopherol content were analyzed, and the genetic loci for tocopherol were identified with genome-wide association analysis and linkage analysis. There was no significant difference in total tocopherol in grain of wheat grown in three environments. Seven high-tocopherol (≥ 110 μg/g) germplasms were selected. The genotypic and environmental effects on total tocopherol and its three components ranked G > G × E > E and the tocopherol content were not correlated with accession types, spring/winter variety, red/white grain and release years. Among the eleven agronomic and four grain traits, α-tocopherol was positively correlated with grain thickness, γ-tocopherol was positively correlated with heading date, maturity date and flag leaf length, and γ-, δ- and total tocopherol were negatively correlated with the number of kernels in the middle of the spike. The total tocopherol showed positive correlation with lycopene and lutein. A total of twenty-seven QTL associated with tocopherol were identified with genome-wide association analysis, with obvious additive effects. The fine mapping of Qδ.toc.6 A narrowed functional region down to a 5.26-Mb region via analyzing the tocopherol content among genotypes in secondary mapping population. We proposed five candidate genes with known pathways for tocopherol synthesis in wheat, potentially useful in breeding high-tocopherol wheat varieties.
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