Quantitative trait loci mapping of freezing tolerance and photosynthetic acclimation to cold in winter two‐ and six‐rowed barley |
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Authors: | Miros?aw Tyrka Marcin Rapacz Anna Fiust Magdalena Wójcik‐Jag?a |
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Institution: | 1. Department of Biochemistry and Biotechnology, Rzeszów University of Technology, Albigowa, Poland;2. Department of Plant Physiology, Faculty of Agriculture and Economics, Agricultural University in Kraków, Kraków, Poland |
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Abstract: | Photoacclimation (PA) and freezing tolerance (FT) have been identified as closely related traits, due to common mechanisms of environmental control. In this study, diversity array technology (DArT) was used for identification of the quantitative trait loci (QTL) of FT and PA in winter barley. Simple sequence repeat (SSR) and single nucleotide polymorphism (SNP) markers were subsequently used to saturate QTL regions. Two F2 mapping populations were created, for two‐rowed (P44) and six‐rowed barley (CaP). Different regions of the genome were responsible for differences in traits between parents in these two populations. Eleven QTLs were identified in the P44 population, including five typical for FT and PA, on chromosomes 2H, 3H and 7H. In the CaP population, only one QTL connected with PA and 10 connected with FT were found on all chromosomes except 2H. Our results demonstrate that different sets of markers should be applied in marker‐assisted selection for FT in two‐ and six‐rowed barley, as several loci determine FT at the level of biparental crosses. |
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Keywords: | chlorophyll fluorescence freezing tolerance quantitative trait loci photoacclimation winter barley |
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