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Genetic Relationships among Soybean Plant Introductions with Resistance to Soybean Cyst Nematodes

Dep. of Crop and Soil Sciences, Michigan State Univ., East Lansing, MI 48824
Dep. of Agronomy and Dep. of Biological Sciences, Clemson Univ., Clemson, SC 29631
Plant Science Unit, Univ. of Missouri, Columbia, MO 65211
Dep. of Agronomy, Iowa State Univ., Ames, IA 50011

^* Corresponding author (diers{at}pilot.msu.edu).

Soybean [Glycine max (L.) Merr.] cultivars in the USA, which are resistant to soybean cyst nematode (SCN) (Heteroderag lycines Ichinohe), have resistance derived from only a few plant introductions (PIs). Many other SCN resistant PIs have been identified which could be used as sources for broadening the diversity of resistance genes in cultivars. The objectives of this research were to study the relationship among PIs with SCN resistance using restriction fragment length polymorphism (RFLP) markers and to assess their resistance response to five races of H. glycines. Thirty-eight PIs previously reported as being resistant to one or more SCN races were evaluated for resistance to H. glycines Races 1, 2, 3, 5, and 14 in a greenhouse and were tested with 201 genomic DNA clones. PI 437654 and PI 438489B were resistant to all five SCN races. Four PIs were resistant to four SCN races, nine resistant to three races, four resistant to two races, four resistant to one race and the remainder had only moderate resistance or moderate susceptibility to one or more races. The PIs were polymorphic for 138 clones which revealed 301 polymorphic DNA fragments. The groupings of the PIs for both cluster analysis and principal component analysis (PCA) were associated with resistance responses to races of H. glycines. One major group of PIs was distant from all previously used sources of resistance. These PIs had only moderate resistance to Race 3 but could potentially provide new genes for resistance to this race. The other PIs were in groups that included Pls with resistance sources previously used by breeders. This information on the relationship of the PIs should help researchers developing resistant soybean cultivars to identify sources of SCN resistance which are not closely related to previously used sources.

Received for publication January 21, 1997.

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