Mapping and confirmation of soybean quantitative trait loci for oleic acid content and reaction to Asian soybean rust
Monteros, Maria Jose
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Soybean, Glycine max (L.) Merril, is a major commodity traded in world markets and is currently the world’s primary oilseed crop. Increasing oleic acid content of soybean oil would reduce the need for hydrogenation, which creates unhealthy trans fatty acids. Six oleic acid quantitative trait loci (QTL) from the mid-oleic soybean line N00-3350 have been mapped and confirmed on linkage groups A1, D2, G, and L using SSR markers. Additional sequence-based markers have been mapped to these regions in the soybean genome. Asian soybean rust (ASR) caused by Phakopsora pachyrhizi, was reported for the first time in the USA in 2004 and has the potential to cause considerable losses in soybean yield. A novel source of resistance to ASR from the cultivar Hyuuga has been mapped to LG-C2 using SSR and SNP markers, and its location has been confirmed in an independent population. The identification of molecular markers closely linked to the identified oleic acid QTL and the ASR resistance gene from Hyuuga will facilitate the use of marker-assisted selection (MAS) in soybean breeding programs to increase the oleic acid content in soybean seed and develop ASR resistant soybean cultivars with desirable agronomic performance adapted to the various production regions of the USA.