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The potato (
Solanum tuberosum
) is the world’s fourth major food crop. The potato is ideally suited for improvement by modern genetic manipulation methods, as it is highly amenable to a wide range of various tissue-culture techniques (
1
). In recent years, a combination of cellular and molecular approaches, including somatic hybridization and genetic transformation, have been employed to improve existing potato cultivars (
2
). Genetic transformation, however, provides a more direct and controlled method for manipulating the genome of potato for both basic and applied research purposes (
3
). This chapter describes the
Agrobacterium
-mediated transformation method for potato genotypes.
Agrobacterium tumefaciens
and its Ti-plasmid have been used extensively as vectors to introduce engineered genes into plants (
4
). In order for genetic modification via
Agrobacterium
to be successful, both a reproducible regeneration system and an efficient
DNA
delivery system directed toward those cells capable of regeneration are mandatory. An ability to select the transformed cells from a large number of untransformed cells is also essential, because transformation frequency is usually between 5 and 50%.
