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A Retrospective DNA Marker Assessment of the Development of Insect Resistant Soybean

^a Monsanto Company, Galena, MD 21635
^b Dep. of Crop and Soil Sciences, Univ. of Georgia, Athens, GA 30602-7272
^c Dep. of Entomology, Univ. of Georgia, Athens, GA 30602-7272
^d USDA/ARS, Crop Genetics and Breeding Research Unit, Tifton, GA 31793

View larger version (25K): [in a new window]   Fig. 1. QTL-likelihood traces for SIR QTLs found to condition resistance to corn earworm in the Cobb x PI 229358 mapping population LGs D1b, G, H, and M. RFLP markers that were found most tightly linked to the SIR QTLs by Rector et al. (1998)(2000) are indicated by a single asterisk. Markers found most tightly linked to the SIR QTLs in this study are indicated by two asterisks. The significance threshold is indicated by a line at LOD = 2.0. Map scales are indicated by bars representing 10 cM. Markers positioned at the same location on a LG mapped less than 0.05 cM apart.

View larger version (35K): [in a new window]   Fig. 2. Graphical genotypes of an 82-cM segment of LG M containing SIR-M for PI 229358 and for the 15 SIR genotypes described in Table 1. Numbers shown between markers in PI 229358 are estimated genetic differences in centimorgans. As described in Table 2, maximum LOD scores occurred in different, but adjacent intervals for different resistance effects. The most likely position for the antixenosis QTL is indicated by a dotted arrow and for the antibiosis QTL by a solid arrow. Genomic segments were coded according to the origin of the SSR allele. White segments indicate PI 229358 (or PI 171451) origin, black segments indicate non-PI origin, vertical-striped segments indicate that a genotype was heterogeneous for a locus (found only in GatIR-81-296 for Satt590 and Satt150), and gray segments indicate that a locus was not informative at that genotype. The percentage of PI 229358 or PI 171451 genome introgressed was estimated from informative markers (e.g., the estimate of zero for N79-2282 does not include the region defined by Satt220).