Submitted to: Crop Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 7/1/2006
Publication Date: 12/1/2006
Citation: Wang, Y., Hobbs, H.A., Bowen, C.R., Bernard, R.L., Haudenshield, J.S., Domier, L.L., Hartman, G.L. 2006. Evaluation of soybean cultivars, 'Williams' isogenic lines, and other selected soybean lines for resistance to two soybean mosaic virus strains. Crop Science. 46(6):2649-2653. Interpretive Summary: Soybean mosaic virus (SMV) is one of the most common soybean viruses worldwide, and is aphid- and seed-transmitted. The introduction of the Asian soybean aphid is likely to exacerbate SMV problems in the U.S. in the future. Information on the occurrence of resistance to SMV-G1 and G5 in current soybean cultivars has not been studied. The objective of this study was to evaluate current soybean cultivars and other selected lines for resistance to SMV-G1 and G5. Based on multiple tests, 1.5% and 6.7% of the 855 cultivars were resistant to SMV-G1 and SMV-G5, respectively. No cultivars were resistant to both strains. This information will be useful to scientists interested in soybean virus resistance.
Technical Abstract: The soybean cultivars grown in the U.S. have a relatively narrow genetic base. Soybean mosaic virus (SMV) is one of the most common soybean viruses worldwide. The resistance/susceptibility of most commercial cultivars to SMV is not known. Commercial and pre-commercial soybean cultivars were screened for resistance to SMV strains G1 and G5. Based on multiple tests, 1.5% and 6.7% of the 855 cultivars were resistant to SMV-G1 and SMV-G5, respectively. No cultivars were resistant to both strains. Expression of different SMV resistance genes in ‘Williams’ isogenic lines inoculated with both SMV strains indicated that lines with Rsv1-y from ‘Dorman’, or unnamed resistance genes from ‘Kosamame’, and ‘Sodendaizu’, were resistant to G1 and susceptible to G5. Lines with Rsv1 alleles from PI 96983, ‘Marshall’, or ‘Ogden’ were resistant to both strains, and lines with Rsv1 alleles from ‘Raiden’, ‘SS 74185’, or ‘Suweon 97’ were resistant to G1 and produced a systemic necrosis reaction with G5. Lines with Rsv3-h from ‘Hardee’ were susceptible to G1 and resistant to G5. Isogenic lines with SMV resistance genes from ‘Buffalo’ showed either a resistant-resistant or resistant-susceptible reaction to the two SMV strains, suggesting the presence of more than one SMV resistance gene. Ten selected lines with reported or observed resistance to SMV were inoculated with the two SMV strains. Some lines were resistant to either G1 or G5, and some were resistant to both strains.