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Identification of novel sources of host plant resistance to the soybean aphid

Raman Bansal, M. A. R. Mian, Andy P. Michel
Journal of economic entomology 2013 v.106 no.3 pp. 1479-1485
Aphis glycines, Glycine max, biotypes, cultivars, evolution, genes, germplasm evaluation, host plants, insect pests, pest resistance, soybeans, Midwestern United States
While soybean cultivars with resistance to the soybean aphid (Aphis glycines Matsumura) have been commercially released, the presence of virulent biotypes capable of overcoming plant resistance threatens the durability of host-plant resistance as a stable management tactic. Novel sources of host plant resistance (HPR) are needed to combat rapid biotype evolution. In this study, we screened 1,021 soybean Plant Introductions (PIs) for resistance to 3 known biotypes of A. glycines. Based on a series of growth chamber and field screenings, we identified 11 PIs which showed resistance against biotype 1 of A. glycines. Among these 11 PIs, 7 PIs were resistant to biotype 2 and 5 PIs were resistant to biotype 3. Further, 2 PIs showed resistance against all 3 biotypes of A. glycines. We also identified 11 PIs that were potentially tolerant to A. glycines, illustrated by no adverse impact on plant quality. Since resistant PIs identified in this study belong to MG II-IV they can be readily crossed to early maturing cultivars adapted to North-Central states of the US, where A. glycines is a major pest. The genetic characterization of resistance in these PIs and incorporation of the novel resistant genes into elite soybean cultivars will broaden the defense against multiple biotypes of A. glycines.