Population structure and genetic diversity in sweet cassava accessions from South of Brazil

Cassava (Manihot esculenta Crantz) is a crop of high socioeconomic importance for several tropical and subtropical regions the world. It mainly present in small cultivated areas that unintentionally guard large part species' germplasm. The work aimed to evaluate population structure genetic diversity 156 traditional sweet cassava accessions from Western Paraná Midwestern Santa Catarina using 29 microsatellite molecular markers. All loci included were considered polymorphic, ranging 3.00 7.00, with an average 3.93 alleles per locus, value heterozygosity (Ho) was 0.6185. polymorphism information content (PIC) presented amplitude varied 0.4887 (GA134) 0.7041 (GA131), 0.6130, while ranged 0.5688 0.7424 0.6751. Analysis based on demonstrate can be separated into two distinct subpopulations - some mixtures observed according Delta K = 2 groups. ideal number groups found at 3, level which divided grouped unique subpopulation. variability among cultivars evaluated wide, most dissimilar mostly Toledo states, constituting source genes breeding programs development new cultivars.