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ENVIRONMENTAL STRESS AND ADAPTATION TO STRESS

HKT1;5-Like Cation Transporters Linked to Na⁺ Exclusion Loci in Wheat, Nax2 and Kna1^1,[OA]

Commonwealth Scientific and Industrial Research Organization Plant Industry, Canberra, Australian Capital Territory 2601, Australia (C.S.B., J.D.P., W.S., R.A.J., E.S.L., E.S.D., R.M.); and Australian Centre for Plant Functional Genomics, Glen Osmond, South Australia 5064, Australia (C.S.B., M.T.)

Bread wheat (Triticum aestivum) has a greater ability to exclude Na⁺ from its leaves and is more salt tolerant than durum wheat (Triticum turgidum L. subsp. durum [Desf.]). 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 colocates to the deletion bin containing Kna1 on chromosome 4DL. This work provides evidence that Nax2 and Kna1 are strongly associated with HKT1;5 genes.

The author responsible for distribution of materials integral to the findings presented in this article in accordance with the policy described in the Instructions for Authors (www.plantphysiol.org) is: Caitlin S. Byrt (caitlin.byrt{at}csiro.au).

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www.plantphysiol.org/cgi/doi/10.1104/pp.106.093476

^* Corresponding author; e-mail caitlin.byrt{at}csiro.au; fax 61–2–6246–5399.

Received November 21, 2006; accepted February 3, 2007; published February 23, 2007.

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