Validation of mega-environment universal and specific QTL associated with seed yield and agronomic traits in soybeans |
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Authors: | Laura Palomeque Li-Jun Liu Wenbin Li Bradley R. Hedges Elroy R. Cober Mathew P. Smid Lewis Lukens Istvan Rajcan |
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Affiliation: | (1) Department of Plant Agriculture, Crop Science Building, University of Guelph, 50 Stone Road East, Guelph, ON, N1G 2W1, Canada;(2) Soybean Research Institute of Heilongjiang, Harbin, Heilongjiang, People’s Republic of China;(3) Soybean Research Institute, Northeast Agricultural University, Harbin, Heilongjiang, People’s Republic of China;(4) Pioneer Hi-bred Ltd., A DuPont Company, Chatham, ON, Canada;(5) Agriculture and Agrifood Canada, Eastern Cereal and Oilseed Crop Research Centre, Ottawa, ON, Canada;(6) Present address: Dow Agrosciences, Indianapolis, IN, USA; |
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Abstract: | The value of quantitative trait loci (QTL) is dependant on the strength of association with the traits of interest, allelic diversity at the QTL and the effect of the genetic background on the expression of the QTL. A number of recent studies have identified QTL associated with traits of interest that appear to be independent of the environment but dependant on the genetic background in which they are found. Therefore, the objective of this study was to validate universal and/or mega-environment-specific seed yield QTL that have been previously reported in an independent recombinant inbred line (RIL) population derived from the cross between an elite Chinese and Canadian parent. The population was evaluated at two field environments in China and in five environments in Canada in 2005 and 2006. Of the seven markers linked to seed yield QTL reported by our group in a previous study, four were polymorphic between the two parents. No association between seed yield and QTL was observed. The result could imply that seed yield QTL were either not stable in this particular genetic background or harboured different alleles than the ones in the original mapping population. QTLU Satt162 was associated with several agronomic traits of which lodging was validated. Both the non-adapted and adapted parent contributed favourable alleles to the progeny. Therefore, plant introductions have been validated as a source of favourable alleles that could increase the genetic variability of the soybean germplasm pool and lead to further improvements in seed yield and other agronomic traits. |
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