Cited by 91Plant Stress Responses and ToleranceWheat and Barley Genetics and PathologyGenetic Mapping and Diversity in Plants and Animals

Mapping of HKT1;5 Gene in Barley Using GWAS Approach and Its Implication in Salt Tolerance Mechanism

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Hazzouri, Khaled M., Khraiwesh, Basel, Amiri, Khaled M. A., Pauli, Duke, Blake, Tom, Shahid, Mohammad, Mullath, Sangeeta K., Nelson, David +4 more·2018·Frontiers in Plant Science

Abstract

Sodium (Na+) accumulation in the cytosol will result in ion homeostasis imbalance and toxicity of transpiring leaves. Studies of salinity tolerance in the diploid wheat ancestor Triticum monococcum showed that HKT1;5-like gene was a major gene in the QTL for salt tolerance, named Nax2. In the present study, we were interested in investigating the molecular mechanisms underpinning the role of the HKT1;5 gene in salt tolerance in barley (Hordeum vulgare). A USDA mini-core collection of 2671 barley lines, part of a field trial was screened for salinity tolerance, and a Genome Wide Association Study (GWAS) was performed. Our results showed important SNPs that are correlated with salt tolerance that mapped to a region where HKT1;5 ion transporter located on chromosome 4. Furthermore, sodium (Na+) and potassium (K+) content analysis revealed that tolerant lines accumulate more sodium in roots and leaf sheaths, than in the sensitive ones. In contrast, sodium concentration was reduced in leaf blades of the tolerant lines under salt stress. In the absence of NaCl, the concentration of Na+ and K+ were the same in the roots, leaf sheaths and leaf blades between the tolerant and the sensitive lines. In order to study the molecular mechanism behind that, alleles of the HKT1;5 gene from 5 tolerant and 5 sensitive barley lines were cloned and sequenced. Sequence analysis did not show the presence of any polymorphism that distinguishes between the tolerant and sensitive alleles. Our real-time RT-PCR experiments, showed that the expression of HKT1;5 gene in roots of the tolerant line was significantly induced after challenging the plants with salt stress. In contrast, in leaf sheaths the expression was decreased after salt treatment. In sensitive lines, there was no difference in the expression of HKT1;5 gene in leaf sheath under control and saline conditions, while a slight increase in the expression was observed in roots after salt treatment. These results provide stronger evidence that HKT1;5 gene in barley play a key role in withdrawing Na+ from the xylem and therefore reducing its transport to leaves. Given all that, these data support the hypothesis that HKT1;5 gene is responsible for

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Authors
Hazzouri, K. M., Khraiwesh, B., Amiri, K. M. A., Pauli, D., Blake, T., Shahid, M., Mullath, S. K., Nelson, D., Mansour, A. L., Salehi-Ashtiani, K., Purugganan, M., & Masmoudi, K.
Affiliations
  • New York University Abu Dhabi (AE)
  • United Arab Emirates University (AE)
  • Cornell University (US)
  • Montana State University (US)
  • International Center for Biosaline Agriculture (AE)
Corresponding author
  • Hazzouri, Khaled M.
  • Masmoudi, Khaled
Venue
Frontiers in Plant Science
Published
2018-02-19
Volume
9
Pages
156-156
ISSN
1664-462X (ISSN-L)
OpenAlex
W2793727353
Cited by
91
References
77
Citations by year
2026: 11 · 2025: 4 · 2024: 8 · 2023: 10 · 2022: 17 · 2021: 14 · 2020: 14 · 2019: 11 · 2018: 1
FWCI
8.85
Type
journal article
Language
en
Open access
Locations
  • Frontiers in Plant Science (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
United Arab Emirates University (31F096)
Topics
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant Stress Responses and Tolerance
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Wheat and Barley Genetics and Pathology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic Mapping and Diversity in Plants and Animals
Keywords
HKT1, barley, salt tolerance, salt stress, sodium accumulation, ion homeostasis, xylem loading, chromosome 4, gene expression, QTL mapping

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