Sweet Sorghum Genetic Diversity and Association Mapping for Brix and Height

Murray, S.C. and Rooney, W.L. and Hamblin, M.T. and et al, . (2009) Sweet Sorghum Genetic Diversity and Association Mapping for Brix and Height. The Plant Genome, 2 (1). pp. 48-62.

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Abstract

Sweet sorghum [Sorghum bicolor (L.) Moench], like its close relative, sugarcane (Saccharum spp.), has been selected to accumulate high levels of edible sugars in the stem. Sweet sorghums are tall and produce high biomass in addition to sugar. Little has been documented about the genetic relationships and diversity within sweet sorghums and how sweet sorghums relate to grain sorghum racial types. In this study, a diverse panel of 125 sorghums (mostly sweet) was successfully genotyped with 47 simple sequence repeats (SSRs) and 322 single nucleotide polymorphisms (SNPs). Using both distance-based and model based methods, we identified three main genetic groupings of sweet sorghums. Based on observed phenotypes and known origins we classified the three groups as historical and modern syrup, modern sugar/energy types, and amber types. Using SSR markers also scored in an available large grain sorghum germplasm panel, we found that these three sweet groupings clustered with kafi r/bicolor, caudatum, and bicolor types, respectively. Using the information on population structure and relatedness, association mapping was performed for height and stem sugar (brix) traits. Three significant associations for height were detected. Two of these, on chromosomes 9 and 6, support published QTL studies. One significant association for brix, on chromosome 1, 12kb from a glucose-6-phosphate isomerase homolog, was detected.

Item Type: Article
Uncontrolled Keywords: Sweet sorghum, Genetic relationships, Historical and modern syrup
Author Affiliation: Institute for Genomic Diversity and Dep. of Plant Breeding and Genetics, Cornell Univ., Ithaca, NY 14853
Subjects: Crop Improvement
Divisions: Sorghum
Depositing User: Mr B Krishnamurthy
Date Deposited: 14 Nov 2016 10:44
Last Modified: 14 Nov 2016 10:44
Official URL: http://dx.doi.org/10.3835/plantgenome2008.10.0011
URI: http://eprints.icrisat.ac.in/id/eprint/14546

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