Submitted to: International Crop Science Congress Proceedings
Publication Type: Proceedings
Publication Acceptance Date: 4/8/2008
Publication Date: 4/10/2008
Citation: Mian, R.M., Kang, S., Hammond, R.B. 2008. Identification of Sources of Soybean Aphid Resistance and Mapping of a Dominant Gene. International Crop Science Congress Proceedings. Available: http://www.confabb.com/conferences/49545-5th-international-crop-science-congress-5th-icsc. Interpretive Summary:
Technical Abstract: Soybean, Glycine max (L.) Merr, is the world’s most important source of vegetable oil and protein meal. Soybean ranks third only after corn and wheat in total acres grown for a seed crop in the USA. The Soybean aphid (SA) (Aphis glycines Matsumura) was first reported in the northern soybean growing region of the USA in 2000. By 2004, 80% of the U.S. soybean field was infested by SA. The SA is native to southeastern and eastern Asia and it is long been a pest of soybean in many Asian countries. Three plant introductions (PIs) (PI 243540, PI 567301B, and PI 567324) were identified as resistant to the SA biotype from Ohio. PI 243540 displayed strong antibiosis resistance such that SA was unable to survive on this PI in a non-choice test. The other two resistant PIs possessed mainly antixenosis type resistance. PI 243540 and PI 567301B were also resistant to the SA isolate from Illinois. A single dominant gene controlling SA resistance in PI 243540 was mapped to the soybean molecular linkage group (LG) F. Thus, the SA resistance in PI243540 is controlled by a gene that is independent from the Rag1 gene in cultivar Dowling. This new gene has been named as Rag2. The Rag2 gene has been transferred to elite U.S. soybean cultivars by backcross breeding and marker assisted selection.