METHOD: Glycoalkaloid Assay CONDITIONS: Green House METHOD NARR: Aglycones were separated on TLC silica gel plates. CPB larval survival tests were also conducted. The plants were grown in replicate and those accessions showingpositions were selected for further experiments. PI320287 is represented by two genotypes that give different results. RESULTS NARR: Spatial patterns of glycoalkaloids were investigated. Leaves and petioles expressed Sole level. The stem produced the same types but to a lesser extent. Tubers contained only Sol and no leptines were detected. There were significant differences in larval survival between the various accessions. AUTHOR EXPLANATe that leptine synthesis may be associated with a certain rare chromosomal rearrangement such as transposition. The CPB larval survival test indicates that there is a substantial level of resistance in chc against this insect, althougsfully coped with the glycoalkaloids metabolically. The presence of sol and OH-sol in all Ac-sol containing plants suggests that the Ac-sol is synthesized via OH-sol from sol.