Abstract
The expression of a quantitative phenotype can be controlled through genotype, environment and genotype by environment interaction effects. Further, genotype effects can be attributed to major genes, quantitative trait loci (QTL) and gene by gene interactions, which are also termed epistatic interactions. The present study demonstrates that two-way epistatic interactions can play an important role for the expression of domestication-related traits like heading date, plant height and yield. In the BC2DH population S42, carrying wild barley introgressions in the genetic background of the spring barley cultivar Scarlett, 13, 8 and 12 marker by marker interaction effects could be detected for the traits heading date, plant height and yield, respectively. Significant allelic combinations at interacting loci coincided for heading date, plant height and yield suggesting the presence of pleiotropic effects rather than several linked QTL. The mode of epistasis observed was primarily characterised by either (1) compensatory effects, where allelic combinations from the same genotype buffered the phenotype, or (2) augmented effects, where only the combination of the exotic allele at both interacting loci caused an altered phenotype. The present study shows that estimates of main effects of QTL can be confounded by interactions with background loci, suggesting that the identification of epistatic effects is important for gene cloning and marker-assisted selection. Furthermore, interaction effects between loci and putative candidate genes detected in the present study reveal potential functional relationships, which can be used to further elucidate gene networks in barley.
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Acknowledgments
We thank Dr. Eberhard Laubach (Nordsaat Saatzucht), Dr. Claus Einfeldt (Saatzucht Dr. J. Ackermann), Mr. Josef Breun (Saatzucht Josef Breun) and their teams for conducting the field experiments. The excellent technical assistance of Merle Noschinski, Carsten Golletz, and the team of our experimental station Dikopshof in Wesseling is appreciated. We also like to thank both reviewers for their critical comments which helped us to further improve the value of the manuscript. This work was funded by the German Plant Genome Research Initiative (GABI) of the Federal Ministry of Education and Research (BMBF, project 0312278A).
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Communicated by P. Hayes.
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von Korff, M., Léon, J. & Pillen, K. Detection of epistatic interactions between exotic alleles introgressed from wild barley (H. vulgare ssp. spontaneum). Theor Appl Genet 121, 1455–1464 (2010). https://doi.org/10.1007/s00122-010-1401-y
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DOI: https://doi.org/10.1007/s00122-010-1401-y