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A teosinte-derived allele of an HKT1 family sodium transporter improves salt tolerance in maize

文献类型： 外文期刊

作者： Zhang, Ming 1 ; Li, Yidan 3 ; Liang, Xiaoyan 1 ; Lu, Minhui 2 ; Lai, Jinsheng 2 ; Song, Weibin 2 ; Jiang, Caifu 1 ;

作者机构： 1.China Agr Univ, Coll Biol Sci, State Key Lab Plant Physiol & Biochem, Beijing, Peoples R China

2.China Agr Univ, Ctr Crop Funct Genom & Mol Breeding, Beijing, Peoples R China

3.Jilin Acad Agr Sci, Agrobiotechnol Res Inst, Changchun, Peoples R China

4.China Agr Univ, Lab Agrobiotechnol, Beijing, Peoples R China

5.China Agr Univ, Natl Maize Improvement Ctr China, Dept Agron & Biotechnol, Beijing, Peoples R China

关键词： maize; salt tolerance; Na+ transport; Na+ transporter

期刊名称：PLANT BIOTECHNOLOGY JOURNAL （ 影响因子：13.263； 五年影响因子：11.619 ）

ISSN： 1467-7644

年卷期：

页码：

收录情况： SCI

摘要： The sodium cation (Na+) is the predominant cation with deleterious effects on crops in salt-affected agricultural areas. Salt tolerance of crop can be improved by increasing shoot Na+ exclusion. Therefore, it is crucial to identify and use genetic variants of various crops that promote shoot Na+ exclusion. Here, we show that a HKT1 family gene ZmNC3 (Zea mays L. Na+ Content 3; designated ZmHKT1;2) confers natural variability in shoot-Na+ accumulation and salt tolerance in maize. ZmHKT1;2 encodes a Na+-preferential transporter localized in the plasma membrane, which mediates shoot Na+ exclusion, likely by withdrawing Na+ from the root xylem flow. A naturally occurring nonsynonymous SNP (SNP947-G) increases the Na+ transport activity of ZmHKT1;2, promoting shoot Na+ exclusion and salt tolerance in maize. SNP947-G first occurred in the wild grass teosinte (at a allele frequency of 43%) and has become a minor allele in the maize population (allele frequency 6.1%), suggesting that SNP947-G is derived from teosinte and that the genomic region flanking SNP947 likely has undergone selection during domestication or post-domestication dispersal of maize. Moreover, we demonstrate that introgression of the SNP947-G ZmHKT1;2 allele into elite maize germplasms reduces shoot Na+ content by up to 80% and promotes salt tolerance. Taken together, ZmNC3/ZmHKT1;2 was identified as an important QTL promoting shoot Na+ exclusion, and its favourable allele provides an effective tool for developing salt-tolerant maize varieties.

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