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United States Department of Agriculture

Agricultural Research Service

Research Project: POTATO GENETICS, CYTOGENETICS, DISEASE RESISTANCE, AND PRE-BREEDING UTILIZING WILD AND CULTIVATED SPECIES Title: M6: A diploid potato inbred line for use in breeding and genetics research

item Jansky, Shelley
item Chung, Yong Suk -
item Kittipadukal, Piya -

Submitted to: Journal of Plant Registrations
Publication Type: Germplasm Registration
Publication Acceptance Date: December 19, 2013
Publication Date: February 21, 2014
Repository URL:
Citation: Jansky, S.H., Chung, Y., Kittipadukal, P.P. 2014. M6: A diploid potato inbred line for use in breeding and genetics research. Journal of Plant Registrations. 8(2):195-199.

Interpretive Summary: Most potato cultivars are tetraploid, carrying four sets of chromosomes. Complexities associated with tetraploid genetics have hindered breeding advances. In this paper, we describe a diploid inbred line, carrying two nearly identical sets of genes. This line, named M6 can be used for breeding and genetics research. It carries a dominant gene allowing its offspring to be self-pollinated in order to create additional inbred lines. In addition, M6 carries genes for disease resistance and processing quality.

Technical Abstract: M6 is a vigorous, homozygous breeding line derived by self-pollinating the diploid wild potato relative Solanum chacoense for seven generations. While most wild Solanum species are self-incompatible, this clone is homozygous for the dominant self-incompatibility inhibitor gene Sli. It is homozygous for 90% of SNP markers in the Infinium Array developed by the SolCAP consortium. M6 is vigorous and both male and female fertile, producing seeds in crosses to diploid cultivated and wild potato germplasm. These traits enable us to systematically develop diploid inbred lines, which was not possible in potato breeding until the discovery of Sli. M6 produces tubers under both short and long photoperiods, unlike other wild potato relatives. In addition, M6 has several desirable agronomic traits including high dry matter content, acceptable chip quality, and resistance to soft rot and Verticillium wilt. M6 is being used to develop recombinant inbred line populations.

Last Modified: 11/24/2015
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