† Background and Aims: Dioscorea alata is a polyploid specieswith a ploidy level rangingfromdiploid(2n = 2x = 40) to tetraploid (2n = 4x = 80). Ploidy increase is correlated with better agronomic performance. The lack of knowledge about the origin of D. alata spontaneous polyploids (triploids and tetraploids) limits the efficiency of polyploid breeding. The objective of the present studywas …