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Published in Crop Sci 25:693-694 (1985)
© 1985 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Phenotypic Recurrent Selection for Resistance to Phytophthora Root Rot in Two Diploid Alfalfa Populations1

R. F. Heisey and R. P. Murphy2

The object of this study was to search for resistance to Phytophthora root rot (caused by Phytophthora raegasperma Drechs. f. sp. medicaginis) among 10 sources of two wild diploid species of alfalfa, Medicago caerulea Less. and M. falcata L. Phenotypic recurrent selection using a greenhouse screening technique was effective in increasing the levels of resistance in 2 of the 10 sources investigated, M. caerulea (PI 388629) and M. falcata (PI 410970). Resistant plants were not found in the other eight sources. These new sources of resistance may be genetically different from the sources currently available in cultivated autotetrapioid alfalfa (M. sativa L.) L.

Key Words: Disease resistance • Medicago falcata L. • Medicago caerulea Less

1 Contribution of the Dep. of Plant Breeding and Biometry, New York State College of Agriculture and Life Sciences, Cornell Univ., Ithaca, NY 14853, as Plant Breeding Series Paper 737. Part of a thesis submitted by the senior author in partial fulfillment of the requirements for the Ph.D. degree.

2 Former graduate research assistant (now plant breeder, Peto Italiano, s.r.l., Canneto di Rodi, 04010 Borgo Sabotino, LT, Italy) and professor emeritus, Dep. of Plant Breeding, Cornell Univ.

Received for publication September 4, 1984.




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