Potato is highly heterozygous. In order to maintain productivity, improved potato varieties are therefore developed by inter-mating desired parental lines and selecting superior clones from the progeny. Since potato is vegetatively propagated, any selected genotype can be fixed with all its intra- and inter-locus interactions responsible for phenotypic expression, and multiplied for commercial cultivation if desired. Recent advances in molecular breeding provide opportunities for rapid genetic gain (Slater et al. 2014a). Nevertheless, phenotypic selection remains the common practice in conventional potato-breeding programmes. Nearly all new varieties of potato still emerge from a process free from use of molecular technologies. This chapter reviews the progress and advances made in phenotypic selection techniques of conventional potato breeding. The role of molecular approaches in improving phenotypic selection is also described briefly.
Table of contents
2 Parental line selection
3 Progeny selection
4 Improving the speed and success rate of selection