Seed yield and insect resistance in near-isogenic soybean lines with introgressed resistance QTL from PI 229358
Warrington, Caleb Van
MetadataShow full item record
The development of superior soybean cultivars [Glycine max (L.) Merr] exhibiting resistance to insects has been hindered greatly due to linkage drag, which refers to the inadvertent co-introgression of undesirable alleles linked to resistance genes. Soybean insect resistance QTLs were previously mapped in a Cobb PI 229358 population to loci on linkage groups (LGs) M, G, H, and D1b using simple-sequence repeat (SSR) markers. Marker-assisted selection (MAS) was utilized to create near-isogenic lines (NILs) with individual SIR QTL in a Benning genetic background. The objectives of this study were to evaluate yield drag at individual resistance QTL in Benning-derived NILs, to assess the amount of PI 229358 genome surrounding each PI 229358 resistance locus with SSR markers, to evaluate the effects of SIR QTL-M, -G, and H on corn earworm (CEW, Helicoverpa zea) and soybean looper (SBL, Pseudoplusia includens), and to confirm a putative SIR QTL on LG D1b.