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Published online 1 September 1990
Published in Agron J 82:855-860 (1990)
© 1990 American Society of Agronomy
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Cyst Nematode vs. Tolerant and Intolerant Soybean Cultivars

D. E. Radcliffe*, R. S. Hussey and R. W. McClendon

Dep. of Agron. Univ. of Georgia, Athens, GA
Dep. of Plant Pathol. Univ. of Georgia, Athens, GA 30602.
Dep. of Agnc. Eng. Univ. of Georgia, Athens, GA 30602.

* Corresponding author

The soybean cyst nematode (SCN), Heterodera glycines Ichinohe, is a major pathogen in soybean [Glycine max (L.) Merr.], and although resistant cultivars have been developed, new races of H. glycines build up that are capable of damaging the resistant cultivars. The use of tolerant and susceptible genotypes of soybean, which support SCN development and reproduction without serious plant growth reduction, is a promising method for limiting SCN yield suppression without creating selection pressure for new races of this nematode

A field study was conducted for 2 yr to determine the effect of SCN initial population (Pi,) densities on soybean root and shoot development in the intolerant and susceptible cultivar, Bragg, and the moderately tolerant cultivar, Wright. Shoot and root growth was stimulated at the low Pi but reduced at high Pi in both years. Harvest seed weight showed a similar response in 1986, but declined steadily with increasing Pi in 1987 when there was less rainfall. The moderately tolerant cultivar, Wright appeared to be a smaller, more efficient plant than the intolerant cultivar, Bragg. Wright had a smaller root system than Bragg, but the roots in the top 0.15 m exhibited compensatory growth in response to early infection by SCN whereas Bragg root growth was suppressed. Wright also had a proportionately deeper root system, compared to Bragg, and this may be part of the mechanism of tolerance.

Research supported by grants from the Science and Education Administration of USDA under grant number 85-CRCR-1-1882 from the Competitive Research Grants Office and Georgia Agric. Commodity Commission for Soybeans and by State and Hatch funds allocated to the Georgia Agric. Exp. Stations.

Received for publication October 23, 1989.




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Copyright © 1990 by the American Society of Agronomy.