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Abstract: The genetic diversity of 219 accessions of Guinea yam germplasm from Benin, Congo, Côte d' Ivoire, Equatorial Guinea, Gabon, Ghana, Nigeria, Sierra Leone and Togo was accessed using 15 microsatellite loci. High diversity of 0.677 was found among the accessions. An allelic average of 8.06 and polymorphic information content (PIC) value of 0.65 was observed for the markers. The observed heterozygosity value of 0.563 suggests that spontaneous hybridization must have contributed to the ancestry of some of the accessions and improvement by farmers must have been far more often by selection of somatic mutants. The twenty distinct cluster groups generated by the radial phylogram shows that Dioscorea cayenensis and D. rotundata are distinct species with intermediate hybrid forms. There was no relationship between relatedness of the accessions and their geographical area of origin. This study contributes to an increased understanding of the genetic organisation of the core germplasm.

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Yi M, Nwe KT, Vanavichit A, Chai-arree W and Toojinda T (2009). Marker-assisted backcross breeding to improve quality traits in Myanmar rice cultivar Manawthukha. Field Crops Research 113(2):178–186. (DOI: 10.1016/j.fcr.2009.05.006). (G4007.03). Not open access: view abstract online

Varshney RK, Mahendar T, Aruna R, Nigam SN, Neelima K, Vadez V and Hoisington DA (2009). High level of natural genetic variation in a groundnut (Arachis hypogaea L.) germplasm collection assayed by selected informative SSR markers. Plant Breeding 128 (5):486–494 (DOI: 10.1111/j.1439-0523.2009.01638.x). Not open access: view abstract.