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ARS Home » Midwest Area » Urbana, Illinois » Soybean/maize Germplasm, Pathology, and Genetics Research » Research » Publications at this Location » Publication #192149
Title: SOYBEAN APHID RESISTANCE IN SOYBEAN 'JACKSON' IS CONTROLLED BY A SINGLE DOMINANT GENE

Author
item HILL, CURTIS - UNIVERSITY OF ILLINOIS
item LI, YAN - 6029 S KIMBARK-CHICAGO
item HARTMAN, GLEN

Submitted to: Crop Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 2/15/2006
Publication Date: 3/1/2006
Citation: Hill, C.B., Li, Y., Hartman, G.L. 2006. Soybean aphid resistance in soybean ‘Jackson’ is controlled by a single dominant gene. Crop Science. 46:1606-1608.

Interpretive Summary: Since its arrival from Asia, the soybean aphid has spread throughout soybean production areas in North America. High aphid populations reduce soybean production directly by causing severe plant damage during feeding, including leaf distortion, stunting, and desiccation. In 2003, extensive economic losses caused by the soybean aphid occurred in soybean in several Midwestern states with an estimated 1.6 million hectares damaged producing a loss of $80 million. Presently, the only means that soybean growers have to control the soybean aphid is with the application of registered insecticides. Plant resistance to the soybean aphid was recently discovered in soybean germplasm. Another cultivar found to have strong antibiosis-type of resistance to the soybean aphid was Jackson. The primary objective of this study was to determine the inheritance of resistance to the soybean aphid in Jackson. Segregation of resistance in F2 and among F2-derived F3 (F2:3) families produced from crosses between Jackson and the susceptible soybean cultivar Loda was analyzed. Segregation of F2 plants was 247 resistant to 97 susceptible and fit a 3:1 genetic ratio (P=0.17). Segregation among F2:3 33 families derived from different F1 plants fit a 1 resistant:2 susceptible:1 susceptible monogenic 34 inheritance ratio. These results indicated that a single dominant gene controlled resistance in Jackson. There is no known genetic relationship between Jackson and Dowling. The genetic relationship between Rag1 in Dowling and the gene in Jackson is unknown. This information will be used primarily by private industry in the development of soybean aphid resistant cultivars.

Technical Abstract: The soybean aphid has become established as a serious threat to soybean production in North America. Insecticide applications have been used to combat the aphid, however, soybean resistance to the aphid has recently been identified. A dominant gene found in the soybean cultivar Jackson, that is no longer in production, prevents colonization of soybean aphids on plants that possess it. The soybean aphid, Aphis glycines Matsumara, has become established as a serious pest of soybean, Glycine max (L.) Merr., since it was first found in North America in 2000 and has caused millions of dollars in economic losses. While the application of chemical insecticides is the only means to control the soybean aphid at present, genetic resistance to the aphid was recently discovered in soybean. A single dominant gene named Rag1 that controls resistance to the soybean aphid was found in the cultivar Dowling. Another cultivar found to have strong antibiosis-type of resistance to the soybean aphid was Jackson. The primary objective of this study was to determine the inheritance of resistance to the soybean aphid in Jackson. Segregation of resistance in F2 and among F2-derived F3 (F2:3)families produced from crosses between Jackson and the susceptible soybean cultivar Loda was analyzed. Segregation of F2 plants was 247 resistant to 97 susceptible and fit a 3:1 genetic ratio (P=0.17). Segregation among F2:3 33 families derived from different F1 plants fit a 1 resistant:2 susceptible:1 susceptible monogenic 34 inheritance ratio. These results indicated that a single dominant gene controlled resistance in Jackson. There is no known genetic relationship between Jackson and Dowling. The genetic relationship between Rag1 in Dowling and the gene in Jackson is unknown.