Perennial stability of total quinolizidine alkaloid content in alkaloid-poor Washington lupin (Lupinus polyphyllus Lindl)
Journal of the Science of Food and Agriculture 76(2): 195-199
ISSN/ISBN: 0022-5142 Accession: 003226541
Total content of quinolizidine alkaloids (QA) in shoots, leaves and seeds of alkaloid-poor Washington lupin (Lupinus polyphyllus Lindl) grown in Finland was studied from 1992 to 1994. The results show that during these years the amount of alkaloids in shoots decreased from 202 to 101 mg kg-1 DM. The reduction of QA in seeds was observed as follows: in multicoloured seeds (from 349 to 285 mg kg-1) and in grey seeds (from 218 to 165 mg kg-1) as well as in figured seeds (from 372 to 331 mg kg-1 DM). No reduction of QA in black seeds (change from 249 to 248 mg kg-1) was observed. Total content of QA in leaves averaged 296 mg kg-1 DM. In comparison with the total content of QA of the same plant material grown at the same location in the years 1988-1991, a successive decrease in QA content was observed in shoots and seeds of alkaloid-poor WL. Leaves of unbred lupin also showed a discrete decrease in total QA content. In leaves of alkaloid-poor WL no change in alkaloid level was found. In seeds of unbred WL an increase in QA content was observed. The present data do not confirm the hypothesis that total content of QA in leaves, shoots and seeds of bred (alkaloid-poor) WL increases from year to year.