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Soybean Plant Introductions with Resistance to Races 4 or 5 of Soybean Cyst Nematode

Dep. of Agronomy, Univ. of Missouri, Delta Ctr., Portageville, MO 63873

E. E. Hartwig

USDA-ARS, Soybean Production Res., P.O. Box 196, Stoneville MS 38776

^* Corresponding author.

Soybean cyst nematode (1Heterodera glycines Ichinohe) (SCN) is a serious pest of soybean [Glycine max (L.) Merr.) in the southern USA. A major portion of the U.S. soybean collection has not been screened for races of SCN. Approximately 9000 soybean plant introductions (PIs) were screened for their reaction to SCN races 4 and 5 in the greenhouse. The seedlings were grown in soil infested with SCN, and white females on the roots were counted. We found 21 PIs with some level of resistance to either race 4 or 5. A total of seven resistant, three moderately resistant, and two moderately susceptible PIs for race 4 were identified. Two PI's were heterogeneous for resistant and moderately resistant reactions. For race 5, seven PIs were resistant, two showed moderate resistance, two were moderately susceptible, whereas one segregated for resistant and moderately resistant reactions. All PIs showing resistance to races 4 or 5 were earlier reported to be resistant to race 3 and are in either Maturity Group II, III, or IV. PI 437654 was resistant to both races 4 and 5. In additional tests, it was found to be resistant to five races (races 1 through 5) of SCN. PI 437654 is the only PI resistant to all five recognized races of SCN and would be a good source in resistant cultivar development. These PIs are available to the researchers from the USDA soybean germplasm collection.

Key Words: Glycine max (L.) Merr. • Heterodera glycines Ichinohe • Disease screening • Germplasm

Received for publication July 27, 1987.

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