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The effect of semi-dwarf genes on root system size in field-grown barley

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Abstract

Root system size (RSS) was measured in 12 diverse barley genotypes and 157 double-haploid lines (DHs), using electric capacitance. The parents of the DHs, Derkado and B83-12/21/5, carry different semi-dwarfing genes, sdw1 and ari-e.GP, respectively. Estimates of RSS were taken in the field thrice during plant development: stem elongation (RSS1), heading (RSS2) and grain filling (RSS3). The 12 barley genotypes were assessed over 3 years and at two or three locations each year; the DH mapping population was assessed at two locations in 2002. Among the 12 barley genotypes, those with the semi-dwarf genes had greater RSS values in all 3 years (28.9, 24.6 and 15.0% in years 1, 2 and 3, respectively) compared to non-semi-dwarf controls. The DH population showed transgressive segregation on both sides of the parent means, indicating polygenic control of RSS. Quantitative trait loci (QTLs) for RSS were found on five of the seven chromosomes: 1H, 3H, 4H, 5H and 7H and these were compared with previously mapped agronomic traits. The TotalRSS QTL on 3H was associated with sdw1 and QTLs for height, plant yield and plant weight. The RSS3 QTL on 5H was associated with ari-e.GP and QTLs for height, plant yield, plant weight, harvest index and tiller number. The RSS3 QTL on 7H was also associated with a TotalRSS QTL and QTLs for plant weight and harvest index. Other RSS QTLs were not associated with any other trait studied. RSS is considered to be a polygenic trait linked to important traits, in particular to yield. The study highlights the effects of semi-dwarfing genes and discusses the potential for breeding for root traits.

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Acknowledgements

The study was supported by Czech Republic Ministry of Agriculture (NAZV QF 3191). The Scottish Crop Research Institute receives grant-in aid from the Scottish Executive Environmental and Rural Affairs Department.

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Authors and Affiliations

  1. Mendel University of Agriculture and Forestry, 613 00, Brno, Czech Republic

    Oldrich Chloupek

  2. Scottish Crop Research Institute, Invergowrie, DD2 5DA, Dundee, Scotland, UK

    Brian P. Forster & William T. B. Thomas

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  1. Oldrich Chloupek
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  2. Brian P. Forster
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  3. William T. B. Thomas
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Correspondence to Brian P. Forster.

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Communicated by P. Langridge

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Chloupek, O., Forster, B.P. & Thomas, W.T.B. The effect of semi-dwarf genes on root system size in field-grown barley. Theor Appl Genet 112, 779–786 (2006). https://doi.org/10.1007/s00122-005-0147-4

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