Abstract
Key message
QTL mapping in multiple families identifies trait-specific and pleiotropic QTL for biomass yield and plant height in triticale.
Abstract
Triticale shows a broad genetic variation for biomass yield which is of interest for a range of purposes, including bioenergy. Plant height is a major contributor to biomass yield and in this study, we investigated the genetic architecture underlying biomass yield and plant height by multiple-line cross QTL mapping. We employed 647 doubled haploid lines from four mapping populations that have been evaluated in four environments and genotyped with 1710 DArT markers. Twelve QTL were identified for plant height and nine for biomass yield which cross-validated explained 59.6 and 38.2 % of the genotypic variance, respectively. A major QTL for both traits was identified on chromosome 5R which likely corresponds to the dominant dwarfing gene Ddw1. In addition, we detected epistatic QTL for plant height and biomass yield which, however, contributed only little to the genetic architecture of the traits. In conclusion, our results demonstrate the potential of genomic approaches for a knowledge-based improvement of biomass yield in triticale.
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Acknowledgments
This research was funded by the German Federal Ministry of Education and Research (BMBF) under the promotional reference 0315414A. This publication reflects the views only of the authors. We acknowledge the handling of the funding by the Project Management Organisation Jülich (PtJ). We thank Angela Harmsen for excellent technical assistance in the laboratory and Agnes Rölfing-Finze, Hans Häge, Jacek Till and Justus von Kittlitz for their outstanding work in the greenhouse and field.
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The authors declare that they have no conflict of interest.
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The authors declare that the experiments comply with the current laws of Germany.
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Communicated by P. Langridge.
K. V. Alheit, L. Busemeyer and W. Liu contributed equally to this work.
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Alheit, K.V., Busemeyer, L., Liu, W. et al. Multiple-line cross QTL mapping for biomass yield and plant height in triticale (× Triticosecale Wittmack). Theor Appl Genet 127, 251–260 (2014). https://doi.org/10.1007/s00122-013-2214-6
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DOI: https://doi.org/10.1007/s00122-013-2214-6