Abstract
The sweet potato, Ipomoea batatas (L.) Lam. (2n = 6X = 90), belongs to the section Batatas genus Ipomoea, as do 11 wild species, none of which produces edible storage roots. The cultivation area of this species is localized mainly at low latitudes of South America, South Asia and South Africa, and goes northwards as far as some regions of Europe and the USA. Sweet potato ranks seventh among food crops in annual production in the world (Jabsson and Raman 1991). However, conventional breeding, based on sexual hybridization of sweet potato is not well developed because of its sterility and cross incompatibility. To overcome these limitations, novel approaches such as somatic hybridization and genetic transformation must be incorporated into sweet potato breeding.
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