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United States Department of Agriculture

Agricultural Research Service

Title: Soybean Aphid Resistance Genes in the Soybean Cultivars Dowling and Jackson Map to Linkage Group M

Authors
item Li, Yan - UNIVERSITY OF ILLINOIS
item Hill, Curtis - UNIVERSITY OF ILLINOIS
item Carlson, Shawn - UNIVERSITY OF ILLINOIS
item Diers, Brian - UNIVERSITY OF ILLINOIS
item Hartman, Glen

Submitted to: Molecular Breeding
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: August 11, 2006
Publication Date: January 10, 2007
Citation: Li, Y., Hill, C.B., Carlson, S.R., Diers, B.W., Hartman, G.L. 2007. Soybean aphid resistance genes in the soybean cultivars Dowling and Jackson map to linkage group M. Molecular Breeding 19(1):25-34.

Interpretive Summary: The soybean aphid was first identified as a new soybean pest in the U.S. in 2000. With insecticide treatment costs an estimated $84 to $105 million was spent in 2003 to control soybean aphids. Integrating host plant resistance into a pest management system is an economical way to control aphids. Aphid-resistant soybean genotypes have been reported. The objectives of this study were to map the aphid resistance genes in Dowling and Jackson and to identify flanking markers that could be used in marker-assisted selection. Segregation of aphid resistance and simple sequence repeat markers in F2:3 populations developed from crosses between Dowling and the two susceptible soybean cultivars Loda and Williams 82, and between Jackson and Loda, were analyzed. The molecular markers flanking these resistance genes are being used in marker-assisted selection for aphid resistance in soybean breeding programs. This information is useful for soybean breeders, geneticists and plant biologists.

Technical Abstract: The soybean aphid [Aphis glycines Matsumura] is an important pest of soybean [Glycine max (L.) Merr.] in North America. Single dominant genes in the cultivars Dowling and Jackson control resistance to soybean aphid. The gene in Dowling was named Rag1. It is not known if Rag1 is allelic with the gene in Jackson. The objectives of this study were to map the locations of Rag1 and the Jackson gene onto the soybean genetic map. Segregation of aphid resistance and simple sequence repeat (SSR) markers in F2:3 populations developed from crosses between Dowling and the two susceptible soybean cultivars Loda and Williams 82, and between Jackson and Loda, were analyzed. Both Rag1 and the Jackson gene mapped to soybean linkage group M between the markers Satt435 and Satt463. Rag1 mapped 4.2 cM from Satt435 and 7.9 cM from Satt463. The Jackson gene mapped 1.9 cM from Satt435 and 7.7 cM from Satt463. Further tests to determine genetic allelism between Rag1 and the Jackson gene are in progress. The SSR markers flanking these resistance genes are being used in marker-assisted selection for aphid resistance in soybean breeding programs.

Last Modified: 10/22/2014
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