Soybean Resistance to the Soybean Cyst Nematode Heterodera glycines: An Update.

The soybean cyst nematode (SCN), Heterodera glycines, remains a serious threat to soybean production throughout the world. A lack of genetic diversity in resistant soybean cultivars has led to a widespread shift toward virulence in SCN populations, leaving farmers with few proven options other than nonhost rotation to manage this nematode. Recent advances in our understanding of the genes controlling resistance to the nematode have led to improved molecular markers, which are, in turn, increasing the efficiency and precision of the breeding pipeline. A better understanding of the molecular and biochemical basis of SCN resistance and nematode virulence will provide information useful for the development of a long-term strategic plan for diversification and the deployment of cultivars that protect current sources of natural resistance while identifying new targets for engineering novel resistance.