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Published in Crop Sci 15:208-210 (1975)
© 1975 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Inheritance of Reaction to Race 4 of Soybean-cyst Nematode1

J. D. Thomas, C. E. Caviness, R. D. Riggs and E. E. Hartwig2

Five soybean (Glycine max L. Merr.) crosses involving parents that differed in reaction to race 4 of soybean-cyst nematode (SCN) (Heterodera glycines Ichinohe) were studied in F1, F2, and backcross populations. Reaction of the parents to race 4 was: PI 88788, resistant; PI 90763, moderately resistant; ‘Peking,’ susceptible; ‘Mack’ and ‘Hill,’ very susceptible.

Frequency distributions from three crosses involving parents that were resistant, moderately resistant, and susceptible indicated that three alleles at a single locus conditioned reaction to SCN. Resistance possessed by PI 88788 was recessive to PI 90763 and the moderately resistant reaction of PI 90763 was recessive to the suceptible Peking cultivar. Backcross data also appeared to confirm this inheritance pattern. Segregation in the F2 generation gave a good fit for a ratio of three resistant and 61 susceptible plants from two crosses; Hill x PI 90763 and Mack x PI 90763 which involved very susceptible and moderately resistant parents. This ratio indicated one dominant and two recessive genes conditioned resistance in these crosses. Apparently two additional loci with two alleles at each locus, also are necessary for resistance to race 4.

Key Words: Glycine max L. Merr • Inheritance • Resistance • Heterodera glycines

1 Published with the approval of the Ark. Agr. Exp. Stn. director. Submitted by the senior author in partial fulfillment for a M.S. degree. This research was supported in part by a grant (coop, agreement no. 12-14-100-10) from the ARS, USDA.

2 Research assistant (former graduate assistant) and professor, Dept, of Agron. and professor, Dept, of Plant Pathol. respectively, U. of Ark., Fayetteville, AR 72701. And research agronomist, ARS, USDA, Stoneville, MS 38776.

Received for publication August 6, 1974.




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