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Inheritance of the White Seed Character in Alfalfa¹

Synopsis: White seed in alfalfa is conditioned by a duplicate set of homozygous recessive genes for colorless and one dominant color inhibitor gene. This gene complex also inhibits anthocyanin production throughout the plant. The distribution of the offspring of a white-seeded hybrid having pure alfalfa parentage was interpreted as resulting from selective pairing of chromosomes, and that of a white-seeded hybrid, having as one parent an artificially induced autotetraploid from diploid Medicago falcata, as being the result of random chromosome pairing. These results are taken as evidence that alfalfa is of autotetraploid origin, and has evolved into a functional diploid.

² Plant Breeder, The Great Western Sugar Co., Longmont, Colo. The helpful suggestions and kind advice of Prof. R. A. Brink are gratefully appreciated.

Received for publication April 20, 1956.