Submitted to: American Journal of Potato Research
Publication Type: Abstract Only
Publication Acceptance Date: 5/1/1998
Publication Date: N/A
Citation: N/A Interpretive Summary:
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.