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Published on October 27, 2006; 10.1104/pp.106.088864

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Received August 29, 2006
Accepted October 11, 2006

A Sodium Transporter (HKT7) Is a Candidate for Nax1, a Gene for Salt Tolerance in Durum Wheat

Shaobai Huang *, Wolfgang Spielmeyer , Evans S. Lagudah , Richard A. James , J Damien Platten , Elizabeth S Dennis , and Rana Munns

CSIRO Plant Industry, GPO Box 1600, Canberra 2601, Australia

* Corresponding author; email: shaobai.huang{at}csiro.au.

Durum wheat is more salt sensitive than bread wheat. A novel source of Na+ exclusion conferring salt tolerance to durum wheat is present in the durum wheat Line 149 derived from T. monococcum C68-101, and a QTL contributing to low Na+ concentration in leaf blades, Nax1, mapped to chromosome 2AL. In this study, we used the rice genome sequence and data from the wheat EST 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 co-linearity, but there was an inversion of a chromosomal segment which 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 co-segregated with Nax1 in the high resolution mapping family. The other TmHKT7 member (TmHKT7-A2) was located within the same BAC contig of approximately 145 kb as TmHKT7-A1. TmHKT7-A1 and -A2 showed 83% amino acid identity, with TmHKT7-A2 but not TmHKT7-A1 being 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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