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, Rana Munns

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

262 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)1918-1928
Number of pages11
JournalPlant physiology
Volume143
Issue number4
DOIs
StatePublished - Apr 1 2007

ASJC Scopus subject areas

  • Physiology
  • Genetics
  • Plant Science

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