Submitted to: ASA-CSSA-SSSA Annual Meeting Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 10/13/2010
Publication Date: 11/1/2010
Citation: Arelli, P.R. 2010. Genetically diverse sources of SCN resistance in soybean. ASA-CSSA-SSSA Annual Meeting Abstracts. October 31 - November 4, 2010.
Technical Abstract: In the United States, soybean cyst nematode (SCN, Heterodera glycines) is the most damaging pest on soybean (Glycine max). In 2007, the yield losses caused by SCN in the USA were valued at nearly 1 billion dollars. SCN causes yield reductions by feeding on plant nutrients, retarding root growth, and inhibiting Bradyrhizobium nodulation. Genetic resistance has been the most effective means of controlling SCN. However, nematode populations are genetically variable and over time have adapted to reproduce on resistant cultivars because resistance primarily traces to two soybean accessions: PI88788 and PI548402 (Peking). More than 100 sources of nematode resistance are available in soybean. Cluster analyses have identified soybean lines genetically diverse from the currently used sources, such as PIs 438489B, 437655, 507354, 467312, 22897 (Columbia), 89772, 507471, 494182 and 567516C. Potentially these diverse lines have different gene(s) for SCN resistance. Sources with different gene(s) may provide durable resistance to SCN. But, these diverse sources are highly undesirable agronomically and have no commercial value. Crosses were made with high yielding soybean cultivars to generate segregating progenies for selection. The high yielding lines include ‘5601T’, ‘Hutcheson’, ’Bolivar’ and LG01-5822. The progenies are advanced using a combination of single-plant-selection and/or modified bulk selection methods. Progenies with resistance are selected in F3-derived F5, F6 or F7 generations using greenhouse bioassays and confirmed with molecular markers (SSR) tagged to SCN resistance. Desirable lines/strains are being evaluated in field trials for agronomic traits and data collection, and selections with SCN resistance are in various phases for their development and release.