(Stellenbosch : Stellenbosch University, 1991) Bester, Cecilia; Louw, J. H.; Stellenbosch University. Faculty of AgriSciences. Dept. of Genetics and Institute of Plant Biotechnology.
ENGLISH ABSTRACT: This thesis consists of two articles for publication. The first is a review of sweet potato as agricultural crop and a review of breeding in South Africa before 1950, between 1950 and 1980, and after 1980. This includes a description of the polycross and mass selection methods introduced after 1980, and a critical review of published heritabilities and genetic correlations. The second article deals with the results of analyses of observations in trials undertaken to investigate genetic polymorphism in tuber characteristics, predicted selection response and genotype-environment interaction.