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Published in Crop Sci 11:545-546 (1971)
© 1971 Crop Science Society of America
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Recurrent Selection for Bacterial Wilt Resistance in Alfalfa1

D. K. Barnes2, C. H. Hanson3, F. I. Frosheiser2 and L. J. Elling4

A-C4 and B-C4, two unrelated populations of alfalfa, Medicago sativa L., were subjected to recurring cycles of phenotypic selection for resistance to bacterial wilt caused by Corynebacterium insidiosum (McCull) Jens. Thirty-five hundred to 5,000 seedlings were inoculated in each population per cycle. About 150 plants in each population were intercrossed to initiate each new cycle of selection. The disease severity indices for wilt infection (0 = healthy, 5 = dead) for A-C4 and after one and two cycles of selection were 3.72, 2.53, and 1.38, respectively. Comparable indices for B-C4 and after each of four cycles of selection were 4.25, 3.94, 3.67, 3.13, and 2.63. Wilt indices for Narragansett,’ ‘Ranger,’ and ‘Vernal’ were 4.46, 3.04, and 2.17, respectively. Recurrent phenotypic selection was highly effective for developing resistance to bacterial wilt. Different genetic mechanisms for resistance in the two populations were postulated.

Key Words: Corynebacterium insidiosum (McCull) Jens. • Medicago sativa L. • Disease • Mass selection

1 Joint contribution from Plant Science Research Division, Agricultural Research Service, U.S. Department of Agriculture, and Minnesota Agricultural Experiment Station. Paper No. 7445, Scientific Journal Series, Minnesota Agricultural Experiment Station.

2 Research Geneticist and Research Plant Pathologist, Plant Science Research Division, ARS, USDA, St. Paul, Minn. 55101.

3 Research Agronomist, Plant Science Research Division, ARS, USDA, Beltsville, Md. 20705.

4 Professor of Agronomy, University of Minnesota, St. Paul, Minn. 55101.

Received for publication January 8, 1971.




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