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Fall Dormancy of Five F₁ Medicago sativa L. Populations, Two Reciprocal F₁ Populations, and Respective Parents¹

When crossing alfalfa (Medicago sativa L.) possessing different favorable agronomic traits but different fall dormancies it would be desirable to accurately predict the relative fall dormancy of the F₁. This requires knowledge of inheritance of fall dormancy.

Five dormant cultivars were crossed to one of two nondormant cultivars and the seven parent populations were intracrossed. Reciprocal crosses were made in two cases. One hundred plants from each intracross and intercross were spaced planted into the field and growth of each plant was measured in late August, October, and December. Plant growth was used to estimate dormancy response.

Most F₁ populations closely resembled their respective midparent values; however, some did not. When these deviations occurred, non-dormant growth habit appeared dominant in some crosses and recessive in others. These F₁ deviations from the midparent were not consistent across dates. Reciprocal effects were significant on some dates but were also not consistent.

Key Words: Alfalfa • Inheritance • Breeding • Genetics • Growth • Winter Hardiness

² Alfalfa breeder and assistant, N. K. and Co., Woodland, CA 95695, respectively. Assistant is presently with the Univ. of Nevada, and USDA, Winnemucca, NV 89445.

Received for publication June 19, 1976.

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