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 language | English (US) |
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Pages (from-to) | 1918-1928 |
Number of pages | 11 |
Journal | PLANT PHYSIOLOGY |
Volume | 143 |
Issue number | 4 |
DOIs | |
State | Published - Apr 2007 |
Externally published | Yes |
ASJC Scopus subject areas
- Physiology
- Genetics
- Plant Science