Abstract
The c locus in alfalfa was found to inhibit the formation of xanthophyll as well as anthocyanin pigments. Plants with one or more genes for xanthophyll, but homozygous recessive for the c locus, had cream colored flowers. Phenotypically, the flowers of these plants resembled those from plants homozygous recessive for the loci controlling xanthophyll and anthocyanin production but dominant for the C locus. However, seeds from cream colored plants in this experiment are light in color and the stems lack anthocyanin, in contrast with other cream colored plants which have dark seeds and anthocyanin in the stem. The pigments responsible for the cream color were not identified. Additional studies on flower color inheritance in alfalfa are needed since observed ratios did not always agree with expectations based on previous work.
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