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United States Department of Agriculture

Agricultural Research Service

Title: Geographical Variation of Solanidane Aglycone Glycoalkaloids and Levels of Variability Detected by Aflp Analysis in the Wild Potato Species Solanum Chacoense Bitter

item Ronning, Catherine - FORMERLY OF VEGETABLE LAB
item Kowalski, Stanley - FORMERLY OF VEGETABLE LAB
item Sanford, Lind
item Stommel, John

Submitted to: American Society of Horticulture Science Meeting
Publication Type: Abstract Only
Publication Acceptance Date: June 1, 1999
Publication Date: N/A

Technical Abstract: The Colorado Potato Beetle is a serious pest of the cultivated potato. Natural resistance has been found in the wild potato species Solanum chacoense Bitter, in which the resistance is attributed to foliar leptine glycoalkaloids. Production and accumulation of these compounds within S. chacoense varies widely and is inherited in a quantitative fashion, but high leptine producing clones occur rarely. Accessions from various locations and altitudes of origination were analyzed for glycoalkaloid content to determine the frequency and distribution of genes for leptine production/accumulation. Leptines were detected in eight of the 15 accessions, and the amounts within each accession varied widely. All of the leptine-containing accessions originated from western Argentina. There was no relationship between elevational level and leptine, but there was a negative trend with total glycoalkaloids and elevation. Nine previously unidentified glycoalkaloids were detected, in very high proportions in some accessions. AFLP marker frequency and diversity were used to compare subpopulations of these accessions. AFLP markers revealed substantial diversity among clones. The relationship of marker distribution to glycoalkaloid content is discussed.

Last Modified: 4/22/2015