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https://hdl.handle.net/2440/71502
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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 1546-1696 |
Statement of Responsibility: | 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 Sodium Cation Transport Proteins Symporters Plant Proteins Soil Crosses, Genetic Biological Transport Molecular Sequence Data Xylem Salt-Tolerant Plants Edible Grain |
Rights: | © 2012 Nature Publishing Group, a division of Macmillan Publishers Limited. All Rights Reserved. |
DOI: | 10.1038/nbt.2120 |
Published version: | http://dx.doi.org/10.1038/nbt.2120 |
Appears in Collections: | Agriculture, Food and Wine publications Aurora harvest 5 |
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