Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 23:31-34 (1983)
© 1983 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Inheritance of Resistance to Fusarium Wilt in Alfalfa1

E. H. Hijano, D. K. Barnes and F. I. Frosheiser2

Fusarium wilt caused by Fusarium oxysporum f. sp. medicaginis is an important disease of alfalfa (Medicago sativa L.) which has not been studied genetically. In our study the inheritance of resistance was determined for two unrelated alfalfa germplasm sources. Alfalfa clones, ranging from resistant to very susceptible, were selected from both winterhardy and nonhardy germplasm sources. One set of six parents from each germplasm source was crossed in a complete diallel design with reciprocals. In addition, each parent was selfed and testcrossed onto a susceptible clone. Selected crosses also were made between parents from different germplasm sources. Progenies from all generations were grown simultaneously in the greenhouse for 10 weeks, then inoculated and transplanted into the field. Plants were rated for disease severity three months after transplanting. Qualitative genetic analyses indicated that resistance in both the winterhardy and the nonhardy germplasms was controlled by two genes, a dominant gene (FW1) and an incompletely dominant gene (FW2). Phenotypic recurrent selection should increase Fusarium wilt resistance in most alfalfa populations.

Key Words: Medicago sativa • Fusarium oxysporum • Tetrasomic inheritance • Disease resistance

1 Joint contribution from the Minnesota Agric. Exp. Stn. and the USDA-ARS. Paper No. 11,967, Scientific Journal Series, Minnesota Agric. Exp. Stn. Part of a thesis submitted by the senior author in partial fulfillment of the requirements for the Ph.D. degree.

2 Formerly graduate research assistant, Dep. of Plant Pathology, Univ. of Minnesota (present address Estación Exp. Agr. INTA, 5988 Manfredi, CBA, Argentina), research geneticist, USDA-ARS, Dep. of Agronomy and Plant Genetics, and research plant pathologist, USDA-ARS, Dep. of Plant Pathology, Univ. of Minnesota, St. Paul, MN 55108.

Received for publication February 8, 1982.




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