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Published in Crop Sci 18:821-823 (1978)
© 1978 Crop Science Society of America
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Reproductive Advantage Associated with Resistance to Soybean-Cyst Nematode1

V. D. Luedders and L. A. Duclos2

Cultivars of soybeans [Glycine max (L.) Merr.] resistant (R) and susceptible (S) to the soybean-cyst nematode (Heterodera glycines Ichinohe) were grown separately and together on plots heavily infested with tl~e nematodes and on noninfested plots. Two-cultivar (R and S) mixtures in three maturity groups were grown at three densities for 3 years; each cultivar was also grown in pure stand. The mixtures of equal numbers of R and S seeds were made each year. The reproductive advantage of the R cultivar (i.e., the ratio between yield of R cultivar and yield of S cultivar) was always higher in the mixtures than in the pure stands and higher on infested than on noninfested soil. Since the selective advantage of the R cultivars was higher on soybean-cyst nematode infested land, growing segregating populations for several generations on heavily infested land should increase the frequency of R plants. In such populations, segregation would also increase the frequency of R plants when some genes conditioning resistance were recessive, as in race 3 resistance.

Key Words: Glycine max (L.) Merr. • Heterodera glycines Ichinohe • natural selection

1 Cooperative investigations of the SEA-USDA, and the Missouri Agric. Exp. Stn., Columbia, MO 65211; and Arkansas State Univ., Jonesboro, AR 72401. Approved by the Director of the Missouri Agric. Exp. Stn. as Journal Series No. 8002.

2 Research agronomist, SEA-USDA, Columbia, MO 65211; and Associate Professor of Agronomy and Coordinator of Agricultural Research, Arkansas State Univ., Jonesboro, AR 72401.

Received for publication March 13, 1978.




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