Abstract
Pre-harvest sprouting (PHS) and seed longevity (SL) are complex biological processes of major importance for agricultural production. In the present study, a recombinant inbred line (RIL) population derived from a cross between the German winter wheat (Triticum aestivum L.) cultivars History and Rubens was used to identify genetic factors controlling these two physiological seed traits. A falling number (FN) test was employed to evaluate PHS, while SL was measured using a germination test (and the speed of germination) after controlled deterioration. FN of the population was assessed in four environments; SL traits were measured in one environment. Four major quantitative trait loci (QTL) for FN were detected on chromosomes 4D, 5A, 5D, and 7B, whereas for SL traits, a major QTL was found on chromosome 1A. The FN QTL on chromosome 4D that coincided with the position of the dwarfing gene Rht-D1b only had effects in environments that were free of PHS. The remaining three QTL for FN were mostly pronounced under conditions conducive to PHS. The QTL on the long arm of chromosome 7B corresponded to the major gene locus controlling late maturity α-amylase (LMA) in wheat. The severity of the LMA phenotype became truly apparent under sprouting conditions. The position on the long arm of chromosome 1A of the QTL for SL points to a new QTL for this important regenerative seed trait.
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Acknowledgements
We thank Susanne Wüllner and Drs. Bianca Büttner and Günther Schweizer from LfL for running the Fluidigm marker assays. Prof. Thomas Miedaner (University of Hohenheim) kindly provided DArT marker data. We thank Dr. Johannes Schacht (Limagrain GmbH) for growing the History/Rubens RIL population.
Funding
Parts of the work presented here were supported by the German Federation of Industrial Research Associations (AiF), the German Federal Ministry for Economic Affairs and Technology, the Gemeinschaft zur Förderung der privaten deutschen Pflanzenzüchtung e.V. (GFP), the Austrian Research Promotion Agency (FFG), and the Austrian Seed Association (CORNET project 834766; IGF no. 75 EN/1).
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AB and VM conceived the research. MN, MA-M, PUG, TA, and MO performed and analyzed experiments. VM performed QTL analysis. VM, TA, and AB wrote the manuscript. All authors commented on the manuscript.
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Communicated by: Barbara Naganowska
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Börner, A., Nagel, M., Agacka-Mołdoch, M. et al. QTL analysis of falling number and seed longevity in wheat (Triticum aestivum L.). J Appl Genetics 59, 35–42 (2018). https://doi.org/10.1007/s13353-017-0422-5
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DOI: https://doi.org/10.1007/s13353-017-0422-5