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Identification of positive yield QTL alleles from exotic soybean germplasm in two backcross populations

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Increasing seed yield is an important breeding goal of soybean [Glycine max (L.) Merr.] improvement efforts. Due to the small number of ancestors and subsequent breeding and selection, the genetic base of current soybean cultivars in North America is narrow. The objective of this study was to map quantitative trait loci (QTL) in two backcross populations developed using soybean plant introductions (PIs) as donor parents. The first population included 116 BC2F3-derived lines developed using “Elgin” as the recurrent parent and PI 436684 as the donor parent (E population). The second population included 93 BC3F3-derived lines developed with “Williams 82” as the recurrent parent and PI 90566-1 as the donor parent (W population). The two populations were evaluated with 1,536 SNP markers and during two years for seed yield and other agronomic traits. Genotypic and phenotypic data were analyzed using the programs MapQTL and QTLNetwork to identify major QTL and epistatic QTL. In the E population, two yield QTL were identified by both MapQTL and QTLNetwork, and the PI 436684 alleles were associated with yield increases. In the W population, a QTL allele from PI 90566-1 was associated with a 30% yield increase, however, the PI region also was associated with later maturity and shorter plant height. No epistasis for seed yield was identified in either population. No yield QTL were previously reported at the regions where these QTL map indicating that exotic germplasm can be a source of new alleles that can improve soybean yield.
K S. Kim , B W. Diers , D L. Hyten , M. A. Rouf Mian , J G. Shannon , R L Nelson
Glycine max , agronomic traits , alleles , ancestry , artificial selection , backcrossing , chromosome mapping , cultivars , data analysis , epistasis , genetic background , genetic improvement , germplasm , growth and development , phenotype , plant breeding , plant growth , population , quantitative trait loci , seed yield , single nucleotide polymorphism , soybeans , North America
Journal of Theoretical and Applied Genetics 2012 v.125
Journal Articles, USDA Authors, Peer-Reviewed
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