A single nucleotide substitution in TaHKT1;5‐D controls shoot Na+ accumulation in bread wheat. (22nd July 2020)

• Record Type: Journal Article
• Authors: Borjigin, Chana; Schilling, Rhiannon K.; Bose, Jayakumar; Hrmova, Maria; Qiu, Jiaen; Wege, Stefanie; Situmorang, Apriadi; Byrt, Caitlin; Brien, Chris; Berger, Bettina; Gilliham, Matthew; Pearson, Allison S.; Roy, Stuart J.
• Is Part Of: Plant, cell and environment. Volume 43:Number 9(2020)
• Page Start: 2158
• Page End: 2171
• Publication Date: 2020-07-22
• Subjects: Na+ transport -- plant growth -- salt tolerance -- sodium -- xylem sap Na+; Plant physiology -- Periodicals; Plant cells and tissues -- Periodicals; Plant communities -- Periodicals; 581.105
• DOI: 10.1111/pce.13841
• Languages: English
• ISSNs: 0140-7791

Abstract

Abstract: Improving salinity tolerance in the most widely cultivated cereal, bread wheat ( Triticum aestivum L.), is essential to increase grain yields on saline agricultural lands. A Portuguese landrace, Mocho de Espiga Branca accumulates up to sixfold greater leaf and sheath sodium (Na + ) than two Australian cultivars, Gladius and Scout, under salt stress in hydroponics. Despite high leaf and sheath Na + concentrations, Mocho de Espiga Branca maintained similar salinity tolerance compared to Gladius and Scout. A naturally occurring single nucleotide substitution was identified in the gene encoding a major Na + transporter TaHKT1;5‐D in Mocho de Espiga Branca, which resulted in a L190P amino acid residue variation. This variant prevents Mocho de Espiga Branca from retrieving Na + from the root xylem leading to a high shoot Na + concentration. The identification of the tissue‐tolerant Mocho de Espiga Branca will accelerate the development of more elite salt‐tolerant bread wheat cultivars. Abstract : A bread wheat ( Triticum aestivum L.) landrace Mocho de Espiga Branca maintained similar salinity tolerance compared to commercial cultivars despite accumulating high leaf sodium. An impaired sodium transporter TaHKT1;5‐D was shown to be responsible for the increased shoot sodium in this landrace.