MOLECULAR MARKER LINKED TO NIL/LOW LEPTINE IN SOLANUM CHACOENSE AND IMPLICATIONS FOR LEPTINE BIOSYNTHESIS

Authors: Ronning, Catherine; Stommel, John; Sanford, Lind; Kowalski, Stanley

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.