Submitted to: Crop Science
Publication Type: Peer reviewed journal
Publication Acceptance Date: 6/15/2003
Publication Date: 8/15/2003
Citation: Wang, Y., Hobbs, H.A., Hill, C.B., Domier, L.L., Hartman, G.L., Nelson, R.L. 2005. Evaluation of Ancestral Lines of U.S. Soybean cultivars for resistance to four soybean viruses. Crop Science. 45:639-644. Interpretive Summary: Soybean viruses can adversely affect soybean production. More than 40 viruses infect soybean, yet resistance has been reported for only a few. The cultivated soybean varieties grown in the U.S. have a narrow genetic base, with six ancestors contributing about 50% of the genes in current cultivars. In this study, 52 ancestral soybean lines were evaluated for resistance to Bean pod mottle virus (BPMV), Soybean mosaic virus (SMV) strains G1 and G5, Tobacco ringspot virus (TRSV), and Tobacco streak virus (TSV). Results showed that seven ancestors were resistant to SMV-G1, 16 ancestors were resistant to SMV-G5, only one ancestor, Tanner, was resistant to TSV, and all 52 ancestors tested were susceptible to BPMV and TRSV. This information is important to soybean breeders and pathologist especially those working on host plant resistance.
Technical Abstract: Fifty-two North American ancestral soybean [Glycine max (L.) Merr.] lines were screened for resistance to Bean pod mottle virus (BPMV), Soybean mosaic virus (SMV) strains G1 and G5, Tobacco ringspot virus (TRSV), and Tobacco streak virus (TSV). Seven ancestral lines, 'CNS', 'Haberlandt', 'Ogden', 'Peking', PI 71506, PI 88788, and 'Tokyo' were resistant to SMV-G1. Sixteen lines, 'A.K. (Harrow)', 'Capital', CNS, FC 33243, Haberlandt, 'Illini', 'Improved Pelican', 'Laredo', 'Lincoln', 'Mandarin', 'Mandarin (Ottawa)', Ogden, 'Palmetto', 'Peking', PI 88788, and Tokyo were resistant to SMV-G5. All ancestral lines tested were susceptible to BPMV and TRSV. Only one ancestor, 'Tanner', was resistant to TSV. Based on cultivar registration articles through 2002, there were 16 public soybean cultivars with reported resistance to SMV. The possible donars of resistance for each were identified. Two soybean ancestors, CNS and Ogden, were the most important possible sources of SMV resistance genes in U.S. commercial soybean cultivars, as the pedigree of 79 and 57% of the reported resistant cultivars contained CNS and Ogden, respectively. In most of the cultivar registration articles, reactions to SMV were not reported. With the relatively high frequency of SMV resistance in major ancestral lines, SMV resistance in U.S. cultivars may be more common than expected.