Abstract
Artificial selection has been practiced for thousands of years by humans to make improvements in plant species. Mass selection is one of the earliest methods of artificial selection that enabled domestication of crop plants. Another important type of selection was performed in landraces that are heterogeneous consisting of multiple genotypes and selection of individual plant progenies gives rise to pure lines. The pure line and mass selection theory, procedures, genetic basis, their merits, and limitations are described. The information on the application of mass selection and pure line selection for variety purity and breeder seed production are included.
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