Researchers Develop Soybean Line with Stronger Resistance to Aphids and Mosaic Virus

University of Nebraska–Lincoln researchers have made a significant breakthrough in agricultural science by developing a new soybean line with enhanced resistance to two major pests: soybean aphids and soybean mosaic virus. This groundbreaking achievement combines two key resistance genes, Rag2 and Rsv1-h, to create a genetically unique soybean variety that can better withstand these threats. The research, led by Luis Posadas Martinez, a research assistant professor in the Department of Agronomy and Horticulture, was published in the 2025 special issue of BMC Genomics.

Soybean aphids and soybean mosaic virus are notorious pests that have long posed challenges to soybean production. Soybean aphids, in particular, are common carriers of the soybean mosaic virus, and together they continue to evolve alongside their host plants, making it increasingly difficult for farmers to protect their crops. To address this issue, soybeans have developed natural defense mechanisms through resistance genes known as R-genes. Two of the most important R-genes are Rag2, which provides resistance to soybean aphids, and Rsv1, which offers protection against soybean mosaic virus. Both genes are located on chromosome 13.

Martinez and his team employed a novel approach by recombining these traits to create a soybean genotype that carries a closely linked Rag2-Rsv1-h haplotype. This innovative method involved using a tritrophic plant-insect-pathogen system to develop soybean germplasm with improved dual resistance. The term "tritrophic" refers to the three-level interaction between plants, insects, and pathogens, highlighting the complexity of the system and the need for a comprehensive approach to pest management.

This research represents the first time a plant-insect-pathogen system has been used to develop a soybean genotype with dual resistance to both soybean aphids and soybean mosaic virus. The newly developed genotype is expected to play a crucial role in future soybean breeding efforts, providing stronger protection against these pests and helping to safeguard soybean production.

In addition to its potential impact on soybean farming, the parent lines and recombined genotypes used in this research may also serve as valuable material for further studies examining the relationships among insect carriers, plant hosts, and viruses. By better understanding these interactions, researchers can continue to develop more effective strategies for managing and controlling pests that threaten agricultural productivity.

The development of this new soybean line with enhanced resistance to soybean aphids and soybean mosaic virus is a significant step forward in the fight against these persistent pests. By combining cutting-edge genetic research with a deep understanding of the complex interactions between plants, insects, and pathogens, the University of Nebraska–Lincoln team has created a valuable resource for the agricultural community. This achievement not only promises to improve soybean yields but also underscores the importance of investing in research that can help farmers adapt to the evolving challenges of pest management in the 21st century.