Barley sodium content is regulated by natural variants of the Na
| Autor: | Kelly, Houston, Jiaen, Qiu, Stefanie, Wege, Maria, Hrmova, Helena, Oakey, Yue, Qu, Pauline, Smith, Apriadi, Situmorang, Malcolm, Macaulay, Paulina, Flis, Micha, Bayer, Stuart, Roy, Claire, Halpin, Joanne, Russell, Miriam, Schreiber, Caitlin, Byrt, Matt, Gilliham, David E, Salt, Robbie, Waugh |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Communications Biology |
| ISSN: | 2399-3642 |
| Popis: | During plant growth, sodium (Na+) in the soil is transported via the xylem from the root to the shoot. While excess Na+ is toxic to most plants, non-toxic concentrations have been shown to improve crop yields under certain conditions, such as when soil K+ is low. We quantified grain Na+ across a barley genome-wide association study panel grown under non-saline conditions and identified variants of a Class 1 HIGH-AFFINITY-POTASSIUM-TRANSPORTER (HvHKT1;5)-encoding gene responsible for Na+ content variation under these conditions. A leucine to proline substitution at position 189 (L189P) in HvHKT1;5 disturbs its characteristic plasma membrane localisation and disrupts Na+ transport. Under low and moderate soil Na+, genotypes containing HvHKT1:5P189 accumulate high concentrations of Na+ but exhibit no evidence of toxicity. As the frequency of HvHKT1:5P189 increases significantly in cultivated European germplasm, we cautiously speculate that this non-functional variant may enhance yield potential in non-saline environments, possibly by offsetting limitations of low available K+. Kelly Houston et al. report a genome-wide association study for sodium content in barley to find genetic variants that may improve yield under low soil K + levels. They identify variants of the Na+ transporter-encoding gene HvHKT1;5 as important for sodium content variation in non-saline conditions. |
| Databáze: | OpenAIRE |
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