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Agronomy 2014, 4(4), 556-578;

Genetic Dissection of QTL Associated with Grain Yield in Diverse Environments

Department of Plant Sciences, University of California, Davis, CA 95616, USA
Department of PSES, University of Idaho, 1691 S 2700 W, Aberdeen, ID 83210, USA
Monsanto Company, Filer, ID 83328, USA
University of Idaho, Moscow, ID 83844-2343, USA
Department of Crop and Soil Science, Oregon State University, 109 Crop Science Building, Corvallis, OR 97331, USA
Current address: 925 Road 378, Beaver Crossing, NE 68313, USA.
Author to whom correspondence should be addressed.
Received: 20 October 2014 / Revised: 24 November 2014 / Accepted: 27 November 2014 / Published: 5 December 2014
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Wheat (Triticum aestivum L.) breeding programs strive to increase grain yield; however, the progress is hampered due to its quantitative inheritance, low heritability, and confounding environmental effects. In the present study, a winter wheat population of 159 recombinant inbred lines (RILs) was evaluated in six trials under rainfed, terminal drought, and fully-irrigated conditions, over four years. Quantitative trait locus/loci (QTL) mapping was conducted for grain yield main effect (GY) and the genotype × environment interaction (GEI) effect. A total of 17 QTL were associated with GY and 13 QTL associated with GEI, and nine QTL were mapped in the flanking chromosomal regions for both GY and GEI. One major QTL Q.Gy.ui-1B.2, explaining up to 22% of grain yield, was identified in all six trials. Besides the additive effect of QTL associated with GY, interactions among QTL (QTL × QTL interaction), QTL × environment, and QTL × QTL × environment were also observed. When combining the interaction effects, QTL Q.Gy.ui-1B.2 along with other QTL explained up to 52% of the variation in grain yield over the six trials. This study suggests that QTL mapping of complex traits such as grain yield should include interaction effects of QTL and environments in marker-assisted selection. View Full-Text
Keywords: Triticum aestivum; QTL × QTL interaction; grain yield; genotype × environment interaction Triticum aestivum; QTL × QTL interaction; grain yield; genotype × environment interaction

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Zhang, J.; Chen, J.; Chu, C.; Zhao, W.; Wheeler, J.; Souza, E.J.; Zemetra, R.S. Genetic Dissection of QTL Associated with Grain Yield in Diverse Environments. Agronomy 2014, 4, 556-578.

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