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United States Department of Agriculture

Agricultural Research Service

Title: Molecular Marker Linked to Nil/low Leptine in Solanum Chacoense and Implications for Leptine Biosynthesis

item Ronning, Catherine
item Stommel, John
item Sanford, Lind
item Kowalski, Stanley

Submitted to: American Journal of Potato Research
Publication Type: Abstract Only
Publication Acceptance Date: May 1, 1998
Publication Date: N/A

Technical Abstract: Solanum chacoense, a wild relative of the cultivated potato, contains the foliar-specific leptine glycoalkaloids that are believed to confer resistance to the Colorado Potato Beetle (CPB). Data from segregating F-1 populations were consistent with control of leptine production by a single recessive gene; however, data from subsequent generations strongly suggests the presence of additional factors affecting the inheritance and expression of leptine glycoalkaloids in this population of S. chacoense. A 1500 bp RAPD product, UBC370-1500, that was identified in S. chacoense, is closely linked to high percent solanine+chaconine, and conversely to low percent leptine. UBC370-1500 mapped to the end of the short arm of potato chromosome 1, near the location of a previously mapped major QTL for solanidine. Together, the data suggest that hydroxylation of a common precursor to form leptinidine occurs prior to formation of the solanidine aglycone. Implications of these findings for the development of CPB-resistant potato varieties will be discussed.

Last Modified: 4/22/2015
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