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Wheat grain yield on saline soils is improved by an ancestral Na+ transporter gene

SprMorn 添加于 2012/3/13 10:06:38  2020次阅读 | 0次推荐 | 2个评论

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.

作 者: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 & Matthew Gilliham
期刊名称: Nature Biotechnology
期卷页: 第卷 第期 ~页
学科领域:生命科学 » 农学基础与作物学 » 作物种质资源与遗传育种学
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原文链接:http://www.nature.com/nbt/journal/vaop/ncurrent/full/nbt.2120.html
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