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Effects of Self-Compatibility on Reciprocal Differences and Combining Ability in Medicago sativa L.¹

Eight Medicago sativa L. clones ranging from 11 to 90% of the tripped florets forming pods were crossed by hand in all combinations with and without emasculation. The 28 F₁ families and the 28 reciprocals made with and without emasculation were evaluated for seedling height, seedling weight, recovery, plant height, plant width, and plant weight. Significant reciprocal differences in both emasculated and unemasculated crosses were due to maternal effects (differences when clone was used as a female vs. when used as a male). The magnitude of the maternal effects was not influenced by the self-compatibility of the clone. None of the mean squares for nonmaternal effects in reciprocal crosses were significant. The general combining ability effects were similar for both emasculated and unemasculated progenies irrespective of the self-compatibility of the clone. The data suggested that the numbers of selfed plants produced when crosses were made in the greenhouse without emasculation were not related to the self-compatibility of the clone.

² Professor of Agronomy, and Director, Division of Education, Colombian Agricultural Institute (formerly Graduate Student and Rockefeller Foundation Fellow).

Received for publication May 14, 1966.