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Type: Journal article
Title: Wheat grain yield on saline soils is improved by an ancestral Na+ transporter gene
Author: Munns, R.
James, R.
Xu, B.
Athman, A.
Conn, S.
Jordans, C.
Byrt, C.
Hare, R.
Tyerman, S.
Tester, M.
Plett, D.
Gilliham, M.
Citation: Nature Biotechnology, 2012; 30(4):360-364
Publisher: Nature Publishing Group
Issue Date: 2012
ISSN: 1087-0156
Statement of
Rana Munns, Richard A. James, Bo Xu, Asmini Athman, Simon J. Conn, Charlotte Jordans, Caitlin S. Byrt, Ray A. Hare, Stephen D. Tyerman, Mark Tester, Darren Plett and Matthew Gilliham
Abstract: The ability of wheat to maintain a low sodium concentration ([Na+]) in leaves correlates with improved growth under saline conditions1,2. This trait, termed Na+ exclusion, contributes to the greater salt tolerance of bread wheat relative to durum wheat3,4. To improve the salt tolerance of durum wheat, we explored natural diversity in shoot Na+ exclusion within ancestral wheat germplasm. Previously, we showed that crossing of Nax2, a gene locus in the wheat relative Triticum monococcum into a commercial durum wheat (Triticum turgidum ssp. durum var. Tamaroi) reduced its leaf [Na+] (ref. 5). Here we show that a gene in the Nax2 locus, TmHKT1;5-A, encodes a Na+-selective transporter located on the plasma membrane of root cells surrounding xylem vessels, which is therefore ideally localized to withdraw Na+ from the xylem and reduce transport of Na+ to leaves. Field trials on saline soils demonstrate that the presence of TmHKT1;5-A significantly reduces leaf [Na+] and increases durum wheat grain yield by 25% compared to near-isogenic lines without the Nax2 locus.
Keywords: Oocytes; Cell Membrane; Animals; Xenopus laevis; Saccharomyces cerevisiae; Triticum; Plant Leaves; Plant Roots; Cereals; Sodium; Cation Transport Proteins; Symporters; Plant Proteins; Soil; Crosses, Genetic; Biological Transport; Molecular Sequence Data; Xylem; Salt-Tolerant Plants
Rights: © 2012 Nature Publishing Group, a division of Macmillan Publishers Limited. All Rights Reserved.
RMID: 0020118379
DOI: 10.1038/nbt.2120
Appears in Collections:Agriculture, Food and Wine publications

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