Genome-wide association study of resistant starch (RS) phenotypes in a barley variety collection

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[1] [1,Shu, Xiaoli
[2] Backes, Gunter
[3] Rasmussen, Søren K.
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Rasmussen, S.K. (skr@life.ku.dk) | 1600年 / American Chemical Society卷 / 60期
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Barley is primarily grown for feed and malt; but in some regions of the world it is also considered to be a staple food. Some barley types such as high-amylose barley have also gained importance as health-promoting foods. Starch that is not readily digested in the upper mammalian gastrointestinal system; or resistant starch (RS); is considered to be valuable because it prevents some diet-related diseases such as colon cancer. RS was quantified in a diverse collection of 209 spring barley varieties released in Europe during the past 100 years. The RS content varied from 15% in the collection; with 13 varieties having high RS content (>11%) and 15 varieties below 1%. Combined with genome-wide association scanning (GWAS); SNP markers and candidate genes controlling the RS content in grains were identified. This identified 40 SNP markers with a LOD score above 2; located on chromosomes 2H; 3H; 5H; and; 6H; respectively. Among these SNPs; 10 genes with a known role in starch biosynthesis were associated on the basis of synteny conservation to the rice genome. The β-glucan content was quantified in 61 varieties selected to represent extreme as well as medium RS values. The β-glucan amount in the 15 varieties with RS 11%; and ranged from 1.95 to 2.82% for those with 1%;
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