The inheritance of light-cream coloration of vegetative parts in yellow lupin plants was studied. It was found that this trait is inherited monomerically. In homozygous system the gene responsible for light-cream coloration has a plieotropic action. Among others it causes a lower fertility and reduction of seed yield per plant. In heterozygous system symptoms of heterosis are observed. In many aspects the action of dilutus gene is similar to that of dwarf gene in yellow lupin previously described by the authors of this paper.
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