Abstract
Association mapping is an alternative to mapping in a biparental population. A key to successful association mapping is to avoid spurious associations by controlling for population structure. Confirming the marker/trait association in an independent population is necessary for the implementation of the marker in other genetic studies. Two independent soybean populations consisting of advanced breeding lines representing the diversity within maturity groups 00, 0, and I were screened in multi-site, replicated field trials to discover molecular markers associated with iron deficiency chlorosis (IDC), a major yield-limiting factor in soybean. Lines with extreme phenotypes were initially screened to identify simple sequence repeat (SSR) markers putatively associated with the IDC. Marker data collected from all lines were used to control for population structure and kinship relationships. Single factor analysis of variance (SFA) and mixed linear model (MLM) analyses were used to discover marker/trait associations. The MLM analyses, which include population structure, kinship or both factors, reduced the number of markers significantly associated with IDC by 50% compared with SFA. With the MLM approach, three markers were found to be associated with IDC in the first population. Two of these markers, Satt114 and Satt239, were also found to be associated with IDC in the second confirmation population. For both populations, those lines with the tolerance allele at both these two marker loci had significantly lower IDC scores than lines with one or no tolerant alleles.
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Acknowledgments
We thank the North Dakota Soybean Council for supporting this research and providing financial assistance to Ju Wang. Special thanks to Edward Buckler IV, Jianming Yu, and Zhiwu Zhang for helpful discussions regarding the mixed linear models analysis. Also, we thank Shahryar Kianian and Marvin Fawley for reviewing the manuscript prior to publication.
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Communicated by C. Hackett.
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Wang, J., McClean, P.E., Lee, R. et al. Association mapping of iron deficiency chlorosis loci in soybean (Glycine max L. Merr.) advanced breeding lines. Theor Appl Genet 116, 777–787 (2008). https://doi.org/10.1007/s00122-008-0710-x
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DOI: https://doi.org/10.1007/s00122-008-0710-x