HKT1;5-like cation transporters linked to Na+ exclusion loci in wheat, Nax2 and Kna1

被引:278
作者
Byrt, Caitlin S. [1 ]
Platten, J. Damien
Spielmeyer, Wolfgang
James, Richard A.
Lagudah, Evans S.
Dennis, Elizabeth S.
Tester, Mark
Munns, Rana
机构
[1] Commonwealth Sci & Ind Res Org Plant Ind, Canberra, ACT 2601, Australia
[2] Australian Ctr Plant Funct Genom, Glen Osmond, SA 5064, Australia
关键词
D O I
10.1104/pp.106.093476
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
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 1 transporter, HKT1; 5 (HKT8). The Nax2 region on 5AL is homoeologous to the region on chromosome 4DL containing the major Na 1 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.
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收藏
页码:1918 / 1928
页数:11
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