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Effects of Clones, Generation of Inbreeding and Years on Self-Fertility in Alfalfa¹

Five selected clones of alfalfa, Medicago sativa L., were evaluated for self-fertility over a period of 9 years. Differences among clones and clone x years interactions were significant but the effect of years on the average self-fertility of the group was not significant. Correlations of self-fertility of the clones among years were highly significant. Inbreeding effects on self-fertility varied between clones. C-84, the most self-fertile clone in the group, was significantly reduced in self-fertility in the S₁ generation, whereas the other clones were not affected. Variations in self-fertility were noted among plants within all inbred generations. The number of self-sterile plants tended to increase as inbreeding progressed. Pods per flower tripped, seeds per pod and seed per flower tripped were equally effective as measurements of self-fertility.

Key Words: Correlations • Inbreeding

² Professor of Agronomy, New Mexico State University, Las Cruces.

Received for publication February 2, 1970.