Barley sodium content is regulated by natural variants of the Na+ transporter HvHKT1;5

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 (Lead / Corresponding author), David E. Salt (Lead / Corresponding author), Robbie Waugh (Lead / Corresponding author)

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)
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Abstract

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+.

Original languageEnglish
Article number258
Pages (from-to)1-9
Number of pages9
JournalCommunications Biology
Volume3
Issue number1
Early online date22 May 2020
DOIs
Publication statusE-pub ahead of print - 22 May 2020

Keywords

  • Abiotic
  • Agricultural genetics
  • Plant genetics
  • Salt

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