INDEX WORDSLupinus albus, alkaloid, mutants, genetic control.
SUMMARYThe pattern and concentration of component alkaloids in wildtype and mutant genotypes homozygous for the alleles pauper, exiguus and nutricius in L. albus have been determined. Alkaloid production in genotypes homozygous for identical and complementary alleles have been determined. The study has revealed at least two alleles possessing different effectiveness in reducing alkaloid levels at the pauper locus, and the frequency distribution of alkaloid concentration in F2 indicates dominance of the high-alkaloid allele is incomplete. Seven alkaloids were identified in the wild-type genotype, of which four were found in all homozygous mutant genotypes in approximately similar proportions. The mutatiol3s identified by means of the Dragendorff reaction appear to affect a common substrate without affecting the amount of the different component alkaloids that are produced.
Lupinus mutabilis, alkaloid, genetics, mutal, new mutant allele . SUMMARY A new mutant allele, described here as mutal, which reduces the alkaloid content in dry matter of lupinus mutabilis has been identified following seed treatment with ethyl methane sulphanate . The allele, when homozygous, reduces the alkaloid content from levels of > 2 .0 per cent found in seed dry matter of existing populations to 0 .2-0 .3 per cent and produces plants with vegetative and seed tissues that are organolepticallỳ sweet' . Component alkaloids in plants homozygous for mural differ in respect of the percentage composition of sparteine and of lupanine, as well as possibly of oxa-sparteine and 4-hydroxylupanine, but none is eliminated in genotypes homozygous for the mutant allele . Alkaloid concentration, in so far as not under the control of mutal, has low heritability but lines were isolated following two generations of successive selection which possessed reduced alkaloid levels . These were interpreted to have arisen as a result of recombination of alleles affecting reduction in alkaloid level at several loci . the mutant, mutal, has been established in a pure breeding line which represents a crucial additional step in the evolution of Lupinus mutabilis towards full status as a crop plant .
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