Genetic regulation of growth and nutrient content under phosphorus deficiency in the wild barley introgression library S42IL |
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| Authors: | Behnaz Soleimani Ralf Sammler Andreas Backhaus Heidrun Beschow Erika Schumann Hans‐Peter Mock Nicolaus von Wirén Udo Seiffert Klaus Pillen |
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| Institution: | 1. Institute of Agricultural and Nutritional Sciences, Chair of Plant Breeding, Martin‐Luther‐University Halle‐Wittenberg, Halle, Germany;2. Department of Physiology and Cell Biology, Leibniz‐Institute of Plant Genetics and Crop Plant Research (IPK), Gatersleben, Germany;3. Fraunhofer Institute for Factory Operation and Automation (IFF), Magdeburg, Germany;4. Institute of Agricultural and Nutritional Sciences, Chair of Plant Nutrition, Martin‐Luther‐University Halle‐Wittenberg, Halle, Germany |
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| Abstract: | Phosphorus (P) is an important macronutrient required for plant growth and yield formation. Since decades, breeders aim to optimize P efficiency in crops. We studied a set of 47 wild barley (Hordeum vulgare ssp. spontaneum, Hsp) introgression lines (ILs) in hydroponic culture to identify quantitative trait loci (QTLs) improving growth and nutrient content under P deficiency. Applying a mixed model analysis, a total of 91 independent QTLs were located among 39 ILs, of which 64 QTLs displayed trait‐improving Hsp effects. For example, an unknown Hsp allele on barley chromosome 4H increased shoot dry weight under P deficiency in three overlapping ILs by 25.9%. Likewise, an Hsp allele on barley chromosome 6H increased root dry weight under P deficiency in two overlapping ILs by 27.6%. In total, 31 QTLs confirmed Hsp effects already identified in previous field and glasshouse experiments with the same ILs. We conclude that wild barley contains numerous trait‐improving QTL alleles, which are active under P deficiency. In future, the underlying genes can be subjected to cloning and, simultaneously, used in elite barley breeding. |
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| Keywords: | Hordeum vulgare ssp spontaneum hyperspectral imaging phosphorus deficiency quantitative trait locus analysis wild barley introgression library S42IL |
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