Genetic mapping of root, shoot, yield, and yield component traits in the ‘Pyramid’ by ‘Douglas’ recombinant inbred line (RIL) population of soybean [Glycine max (L.) Merr.]
Soybean [Glycine max (L) Merr.] is a crop highly studied due to its unique and remarkable protein and oil contents. Yield is commonly reduced by diseases, drought, and mineral deficiencies; therefore, it is important to develop soybean cultivars with high yield, drought tolerant, and resistant to diseases. The purpose of this study was to detect quantitative trait loci that underlie root, shoot, seed yield, and yield components traits in soybean. A group of 92 F5-derived recombinant inbred lines derived from a cross of the soybean cultivars 'Pyramid' and 'Douglas' were grown in the greenhouse and in a field in Spring Lake, North Carolina, USA (Harnett County). The genetic linkage map constructed by Njiti et al (2002) was used for quantitative trait loci mapping. The map covered 977.5 cM of the soybean genome, which consisted of 118 markers, 17 linkage groups, 83 linked and 35 unlinked markers. Twelve linkage groups were known and 5 were unknown. By using the method of composite interval mapping of WinQTL Cartographer, I identified a total of 61 QTL (LOD>2.5) for 13 traits (days to flowering, plant height, pod number, seed number, seed weight, maximum root length, lateral root number, root fresh weight, root dry weight, shoot fresh weight, shoot dry weight, ratio of root fresh weight to root dry weight, and shoot fresh weight to shoot dry weight). These quantitative trait loci identified were mapped on 14 linkage groups. Clusters of quantitative trait loci were observed in most linkage groups especially linkage group D1a. The quantitative trait loci identified here can be used in breeding programs to develop high yielding soybean cultivars and tolerant to drought conditions.
Lage, Patricia, "Genetic mapping of root, shoot, yield, and yield component traits in the ‘Pyramid’ by ‘Douglas’ recombinant inbred line (RIL) population of soybean [Glycine max (L.) Merr.]" (2010). ETD Collection for Fayetteville State University. AAI1498899.