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GENETICS OF LUPINUS VIII. VARIATIONS IN THE OCCURRENCE OF ALKALOIDS IN NATURAL POPULATIONS OF LUPINUS NANUS
Author(s) -
Mankinen C. B.,
Harding James,
Elliott Mathilde
Publication year - 1975
Publication title -
taxon
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 81
eISSN - 1996-8175
pISSN - 0040-0262
DOI - 10.2307/1219493
Subject(s) - subspecies , biology , divergence (linguistics) , lupinus , population , botany , zoology , demography , philosophy , linguistics , sociology
Summary Extensive variation was observed for alkaloids in Lupinus nanus. Of the nine alkaloids studied, one was always present, one was nearly always present, one was nearly always absent, and the occurrence of the remaining six was extremely variable. There was little divergence between four geographic subspecies. All populations exhibited polymorphisms for at least two alkaloids. The average number of polymorphisms per population was approximately 4.5 or 50 percent of alkaloids studied. The highest number was found in L. nanus ssp latifolius and the smallest number in L. nanus ssp apricus. The high frequency of some alkaloids suggests natural selection. Alkaloid number 9 was found in all plants throughout all populations of the four subspecies examined. Methods for measuring divergence of populations from subspecies profiles in terms of alkaloid frequencies were developed. Estimates indicated that marginal populations often diverged more from subspecies profiles than did central populations. Methods for measuring population variance were developed and estimates often indicated that central populations were more variable than marginal populations. But these generalizations were not without exception.