Plant Physiology Preview
Published on February 23, 2007; 10.1104/pp.106.093476
OPEN ACCESS ARTICLE
Received November 21, 2006
Accepted February 3, 2007
HKT1;5-like Cation Transporters Linked to Na+ Exclusion Loci in Wheat, Nax2 and Kna1
Caitlin S Byrt *, J Damien Platten , Wolfgang Spielmeyer , Richard A James , Evans S Lagudah , Elizabeth S Dennis , Mark Tester , and Rana Munns
CSIRO Plant Industry, Canberra, Australian Capital Territory, 2601, Australia; Australian Centre for Plant Functional Genomics, Glen Osmond, South Australia, 5064, Australia
* Corresponding author; email: caitlin.byrt{at}csiro.au.
Bread wheat (Triticum aestivum L.) has a greater ability to exclude Na+ from its leaves, and is more salt tolerant, than durum wheat (Triticum turgidum L. ssp. durum). A novel durum wheat, Line 149, was found to contain a major gene for Na+ exclusion, Nax2, which removes Na+ from the xylem in the roots and leads to a high K+ to Na+ ratio in the leaves. Nax2 was mapped to the distal region on chromosome 5AL based on linkage to microsatellite markers. The Nax2 locus on 5AL coincides with the locus for a putative Na+ transporter, HKT1;5 (HKT8). The Nax2 region on 5AL is homoeologous to the region on chromosome 4DL containing the major Na+ exclusion locus in bread wheat, Kna1. A gene member of the HKT1;5 family co-locates to the deletion bin containing Kna1 on chromosome 4DL. This work provides the first evidence that Nax2 and Kna1 are strongly associated with HKT1;5 genes.
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