Diversity analysis of 3365 sorghums in the GCP composite germplasm set based on allelic variation at 41 SSR loci

Hash, C T and etal, . (2007) Diversity analysis of 3365 sorghums in the GCP composite germplasm set based on allelic variation at 41 SSR loci. In: Generation Challenge Programme: Annual Research Meeting, 12–16 Sep 2007, Benoni, South Africa.

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The GCP Global Composite Germplasm Collection of 3372 wild and cultivated sorghums includes 280 elite breeding lines and improved cultivars, 250 Chinese germplasm lines to be provided by CAAS, 64 wild accessions, and >3000 landrace accessions selected from previously defined core collections, for resistance/tolerance to production constraints, and/or for variation in other traits. A set of 48 sorghum SSR markers distributed across all ten linkage groups was chosen following preliminary analysis of 48 diverse genotypes with 104 available SSRs complemented by additional SSRs from CIRAD and ICRISAT. Diversity analysis was performed on 3367 accessions genotyped with 41 SSRs by CIRAD and ICRISAT.. Breeding lines and wild accessions clustered separately from landraces, which exhibited structure explainable by geographic origin. Landrace population substructure was further characterized within racial groups (five basic races and ten hybrid races). Race bicolor showed little evidence of population structure, congruent with it being the original domesticate. Race kafir (largely from Southern Africa) was distinct. Accessions of the durra, caudatum and guinea races each formed four distinct geographic subgroups. The guinea race margaritiferum group formed its own cluster, suggesting independent domestication. Intermediate races behaved similarly. A reference subset of 384 accessions was then defined for allele mining.

Item Type: Conference or Workshop Item (Other)
Subjects: Others > Agriculture-Farming, Production, Technology, Economics
Depositing User: Library ICRISAT
Date Deposited: 30 Jan 2012 14:51
Last Modified: 30 Jan 2012 14:51
URI: http://oar.icrisat.org/id/eprint/5170
Acknowledgement: UNSPECIFIED
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