The Genetic Relationship among Plant Introductions with Resistance to Soybean Cyst Nematodes

摘要

Soybean cultivars in the U.S. have resistance to soybean cyst nematodes (SCN) (Heterodera glycines Ichinohe) derived mostly from the plant introductions (Pis) PI 88788 and 'Peking' (Rao Arelli, 1994). Breeders need to increase the genetic diversity ofSCN resistance genes in cultivars. The use of resistant cultivars will cause nematode race shifts that will lead to their genes no longer providing resistance. There are many Pis in the USDA Soybean Collection that have been identified as resistant to SCN (Ross and Brim, 1957; Epps and Hartwig, 1972; Anand and Gallo, 1984; Young, 1990) and some could be used in breeding programs to broaden the diversity of resistance genes. The objectives of this study were to describe the genetic relationship among SCN resistant Pis and determine the resistance response of these Pis to H. glycines races 1, 2, 3, 5, and 14 in controlled conditions in the greenhouse.