Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 16:458-461 (1976)
© 1976 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Sources and Inheritance of Resistance to Stemphylium Leafspot of Alfalfa1

O. L. Borges, E. H. Stanford and R. K. Webster2

Twenty-three accessions of alfalfa were screened for resistance to Stemphylium leafspot. A high degree of resistance was found in collections of Medicago cancellata M.B., M. falcata L., M. coerulea Less., and M. hemicycla Grossh. However, all of the M. saliva L. introductions were susceptible to Stemphylium botryosum Wallr.

The inheritance of resistance was investigated in selections from M. cancellata (2n=48), M. falcata (2n=32), and M. hemicycla (2n=16). The results showed that resistance in M. hemicycla was determined by a pair of dominant genes with duplicate effects. Our observations indicated that there is a dosage effect of dominant genes on the level of resistance. The mode of inheritance involved in the resistance of the M. falcata and M. cancellata selections was not clear.

Key Words: Medicago sativa • M. falcata • M. cancellata • M. coerulea • M. hemicycla • Stemphylium • Duplicate genes • Gene dosage

1 Contribution from the Dep. of Agronomy and Range Science, Univ. of California, Davis, CA 95616. Part of a dissertation submitted by the senior author in partial fulfillment of the requirements for the Ph.D. degree, Univ. of California, Davis.

2 Former graduate student (present address: Universidad Central de Venezuela, Facultad de Agronomia, Maracay, Estado Aragua, Venezuela), professor of agronomy, and professor of plant pathology, Univ. of California, Davis, CA 95616.

Received for publication July 29, 1975.




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