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Red-root in Alfalfa: Inheritance and Relationship with Flower Color¹

Inheritance of a character conditioning anthocyanin pigmentation in the roots of alfalfa was determined to be governed by a single dominant gene, Rd, inherited in a tetrasomic manner. The c gene controlling white-flowers was epistatic to the Rd gene, red-root being expressed only in plants with colored flowers. The c locus appeared to be a basic color factor for anthocyanin production in all plant parts. The reason for a negative correlation of intensity of flower and root color observed in one family was not evident. Although most of the data were consistent with the hypothesis proposed, the digenic segregations for the Rd and c genes did not fit expected ratios. Linkage and viability problems were among the likely reasons.

² Formerly Research Geneticist, Crops Research Division, and Assistant Professor, University of Minnesota (presently Associate Professor, Vanderbilt University) and Professor, University of California.

Received for publication June 16, 1966.