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Title: A sodium transporter ( HKT7 ) is a candidate for Nax1 , a gene for salt tolerance in durum wheat .
Author: Huang S Spielmeyer W Lagudah ES James RA Platten JD Dennis ES Munns R
Journal: Plant Physiol . Citation: V : 142 ( 4 ) P : 1718-27 Year: 2006 Type: ARTICLE
Literature: oryza Field: title Doc ID: pub17071645 Accession (PMID): 17071645
Abstract: Durum wheat ( Triticum turgidum subsp . durum ) is more salt sensitive than bread wheat ( Triticum aestivum ) . A novel source of Na ( + ) exclusion conferring salt tolerance to durum wheat is present in the durum wheat Line 149 derived from Triticum monococcum C68-101 , and a quantitative trait locus contributing to low Na ( + ) concentration in leaf blades , Nax1 , mapped to chromosome 2AL . In this study , we used the rice ( Oryza sativa ) genome sequence and data from the wheat expressed sequence tag deletion bin mapping project to identify markers and construct a high-resolution map of the Nax1 region . Genes on wheat chromosome 2AL and rice chromosome 4L had good overall colinearity , but there was an inversion of a chromosomal segment that includes the Nax1 locus . Two putative sodium transporter genes ( TmHKT7 ) related to OsHKT7 were mapped to chromosome 2AL . One TmHKT7 member ( TmHKT7-A1 ) was polymorphic between the salt-tolerant and -sensitive lines , and cosegregated with Nax1 in the high-resolution mapping family . The other TmHKT7 member ( TmHKT7-A2 ) was located within the same bacterial artificial chromosome contig of approximately 145 kb as TmHKT7-A1 . TmHKT7-A1 and -A2 showed 83% amino acid identity . TmHKT7-A2 , but not TmHKT7-A1 , was expressed in roots and leaf sheaths of the salt-tolerant durum wheat Line 149 . The expression pattern of TmHKT7-A2 was consistent with the physiological role of Nax1 in reducing Na ( + ) concentration in leaf blades by retaining Na ( + ) in the sheaths . TmHKT7-A2 could control Na ( + ) unloading from xylem in roots and sheaths .
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[ Sen. 1, subscore: 1.00 ]: A sodium transporter ( HKT7 ) is a candidate for Nax1 , a gene for salt tolerance in durum wheat .
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